1.
International Organization for Standardization
–
The International Organization for Standardization is an international standard-setting body composed of representatives from various national standards organizations. Founded on 23 February 1947, the organization promotes worldwide proprietary and it is headquartered in Geneva, Switzerland, and as of March 2017 works in 162 countries. It was one of the first organizations granted general consultative status with the United Nations Economic, ISO, the International Organization for Standardization, is an independent, non-governmental organization, the members of which are the standards organizations of the 162 member countries. It is the worlds largest developer of international standards and facilitates world trade by providing common standards between nations. Nearly twenty thousand standards have been set covering everything from manufactured products and technology to food safety, use of the standards aids in the creation of products and services that are safe, reliable and of good quality. The standards help businesses increase productivity while minimizing errors and waste, by enabling products from different markets to be directly compared, they facilitate companies in entering new markets and assist in the development of global trade on a fair basis. The standards also serve to safeguard consumers and the end-users of products and services, the three official languages of the ISO are English, French, and Russian. The name of the organization in French is Organisation internationale de normalisation, according to the ISO, as its name in different languages would have different abbreviations, the organization adopted ISO as its abbreviated name in reference to the Greek word isos. However, during the meetings of the new organization, this Greek word was not invoked. Both the name ISO and the logo are registered trademarks, the organization today known as ISO began in 1926 as the International Federation of the National Standardizing Associations. ISO is an organization whose members are recognized authorities on standards. Members meet annually at a General Assembly to discuss ISOs strategic objectives, the organization is coordinated by a Central Secretariat based in Geneva. A Council with a membership of 20 member bodies provides guidance and governance. The Technical Management Board is responsible for over 250 technical committees, ISO has formed joint committees with the International Electrotechnical Commission to develop standards and terminology in the areas of electrical and electronic related technologies. Information technology ISO/IEC Joint Technical Committee 1 was created in 1987 to evelop, maintain, ISO has three membership categories, Member bodies are national bodies considered the most representative standards body in each country. These are the members of ISO that have voting rights. Correspondent members are countries that do not have their own standards organization and these members are informed about ISOs work, but do not participate in standards promulgation. Subscriber members are countries with small economies and they pay reduced membership fees, but can follow the development of standards
2.
MPEG-4 Part 12
–
ISO base media file format defines a general structure for time-based multimedia files such as video and audio. The identical text is published as ISO/IEC 15444-12 and it is designed as a flexible, extensible format that facilitates interchange, management, editing and presentation of the media. The presentation may be local, or via a network or other stream delivery mechanism, the file format is designed to be independent of any particular network protocol while enabling support for them in general. It is used as the basis for other file formats. ISO base media file format is based on Apple’s QuickTime container format. The first MP4 file format specification was created on the basis of the QuickTime format specification published in 2001, the MP4 file format known as version 1 was published in 2001 as ISO/IEC 14496-1,2001, as revision of the MPEG-4 Part 1, Systems. In 2003, the first version of MP4 file format was revised and replaced by MPEG-4 Part 14, MP4 file format, the MP4 file format was generalized into the ISO Base Media File format, which defines a general structure for time-based media files. It is used as the basis for file formats in the family such as MP4, 3GP. The ISO base media file format is designed as extensible file format, List of all registered extensions for ISO Base Media File Format is published on the official registration authority website www. mp4ra. org. The registration authority for code-points in MP4 Family files is Apple Inc. codec designers should register the codes they invent, but the registration is not mandatory and some of invented and used code-points are not registered. When someone is creating a new specification derived from the ISO base media file format, if an existing specification already covers how a particular media type is stored in the file format, that definition should be used and a new one should not be invented. The MPEG-4 Part 3 standard also defined storage of audio compression formats. Storage of MPEG-1/2 Audio in the ISO base media file format was defined in ISO/IEC 14496-3, the Advanced Video Coding file format defined support for H. 264/MPEG-4 AVC video compression. The High Efficiency Image File Format is a container format using the ISO base media file format as the basis. While HEIF can be used with any image format, it specifically includes the support for HEVC intra-coded images. Some of the above-mentioned MPEG standard extensions are used by other formats based on ISO base media file format. The 3GPP file format specification also defined extensions to support H.263 video, AMR-NB, AMR-WB, AMR-WB+ audio, the 3GPP2 file format defined extensions for usage of EVRC, SMV or 13K voice compression formats. The JPEG2000 specification defined usage of Motion JPEG2000 video compression, the DVB File Format defined by DVB Project allowed storage of DVB services in the ISO base media file format
3.
International standard
–
International standards are standards developed by international standards organizations. International standards are available for consideration and use worldwide, the most prominent organization is the International Organization for Standardization. International standards may be used either by application or by a process of modifying an international standard to suit local conditions. Technical barriers arise when different groups together, each with a large user base. Establishing international standards is one way of preventing or overcoming this problem, the implementation of standards in industry and commerce became highly important with the onset of the Industrial Revolution and the need for high-precision machine tools and interchangeable parts. Henry Maudslay developed the first industrially practical screw-cutting lathe in 1800, maudslays work, as well as the contributions of other engineers, accomplished a modest amount of industry standardization, some companies in-house standards spread a bit within their industries. Joseph Whitworths screw thread measurements were adopted as the first national standard by companies around the country in 1841 and it came to be known as the British Standard Whitworth, and was widely adopted in other countries. By the end of the 19th century differences in standards between companies were making trade increasingly difficult and strained, the Engineering Standards Committee was established in London in 1901 as the worlds first national standards body. After the First World War, similar national bodies were established in other countries, by the mid to late 19th century, efforts were being made to standardize electrical measurement. An important figure was R. E. B, Crompton, who became concerned by the large range of different standards and systems used by electrical engineering companies and scientists in the early 20th century. Many companies had entered the market in the 1890s and all chose their own settings for voltage, frequency, current, adjacent buildings would have totally incompatible electrical systems simply because they had been fitted out by different companies. Crompton could see the lack of efficiency in this system and began to consider proposals for a standard for electric engineering. In 1904, Crompton represented Britain at the Louisiana Purchase Exposition in Saint Louis as part of a delegation by the Institute of Electrical Engineers. He presented a paper on standardisation, which was so well received that he was asked to look into the formation of a commission to oversee the process. By 1906 his work was complete and he drew up a permanent constitution for the first international standards organization, the body held its first meeting that year in London, with representatives from 14 countries. In honour of his contribution to electrical standardisation, Lord Kelvin was elected as the bodys first President, the International Federation of the National Standardizing Associations was founded in 1926 with a broader remit to enhance international cooperation for all technical standards and specifications. The body was suspended in 1942 during World War II, after the war, ISA was approached by the recently formed United Nations Standards Coordinating Committee with a proposal to form a new global standards body. List of international common standards List of technical standard organisations Global Frameworks and standards organized along function lines, accessed 2014 ^ Cordova
4.
Multimedia
–
Multimedia is content that uses a combination of different content forms such as text, audio, images, animations, video and interactive content. Multimedia contrasts with media that use only rudimentary computer displays such as text-only or traditional forms of printed or hand-produced material, Multimedia devices are electronic media devices used to store and experience multimedia content. Multimedia is distinguished from mixed media in art, for example. The term rich media is synonymous with interactive multimedia, the term multimedia was coined by singer and artist Bob Goldstein to promote the July 1966 opening of his LightWorks at LOursin show at Southampton, Long Island. Goldstein was perhaps aware of an American artist named Dick Higgins, two years later, in 1968, the term multimedia was re-appropriated to describe the work of a political consultant, David Sawyer, the husband of Iris Sawyer—one of Goldsteins producers at LOursin. In the intervening forty years, the word has taken on different meanings, in the late 1970s, the term referred to presentations consisting of multi-projector slide shows timed to an audio track. However, by the 1990s multimedia took on its current meaning, in the 1993 first edition of Multimedia, Making It Work, Tay Vaughan declared Multimedia is any combination of text, graphic art, sound, animation, and video that is delivered by computer. When you allow the user – the viewer of the project – to control what, when you provide a structure of linked elements through which the user can navigate, interactive multimedia becomes hypermedia. The German language society Gesellschaft für deutsche Sprache recognized the words significance, the institute summed up its rationale by stating has become a central word in the wonderful new media world. In common usage, multimedia refers to an electronically delivered combination of media including video, still images, audio, much of the content on the web today falls within this definition as understood by millions. That era saw also a boost in the production of educational multimedia CD-ROMs, the term video, if not used exclusively to describe motion photography, is ambiguous in multimedia terminology. Video is often used to describe the format, delivery format. Multiple forms of content are often not considered modern forms of presentation such as audio or video. Likewise, single forms of content with single methods of information processing are often called multimedia. Performing arts may also be considered multimedia considering that performers and props are multiple forms of content and media. Multimedia presentations may be viewed by person on stage, projected, transmitted, a broadcast may be a live or recorded multimedia presentation. Broadcasts and recordings can be analog or digital electronic media technology. Digital online multimedia may be downloaded or streamed, streaming multimedia may be live or on-demand
5.
Digital audio
–
Digital audio is technology that can be used to record, store, generate, manipulate, and reproduce sound using audio signals that have been encoded in digital form. A microphone converts sound to an electrical signal, then an analog-to-digital converter —typically using pulse-code modulation—converts the analog signal into a digital signal. This digital signal can then be recorded, edited and modified using digital audio tools, digital audio systems may include compression, storage, processing and transmission components. Conversion to a digital format allows convenient manipulation, storage, transmission, modern online music distribution depends on digital recording and data compression. The availability of music as data files, rather than as objects, has significantly reduced the costs of distribution. Before digital audio, the music industry distributed and sold music by selling copies in the form of records. With digital audio and online distribution systems such as iTunes, companies sell digital files to consumers. This digital audio/Internet distribution model is less expensive than producing physical copies of recordings, packaging them. An analog audio system captures sounds, and converts their physical waveforms into electrical representations of those waveforms by use of a transducer, the sounds are then stored, as on tape, or transmitted. The process is reversed for playback, the signal is amplified. Analog audio retains its fundamental wave-like characteristics throughout its storage, transformation, duplication, analog audio signals are susceptible to noise and distortion, due to the innate characteristics of electronic circuits and associated devices. Disturbances in a system do not result in error unless the disturbance is so large as to result in a symbol being misinterpreted as another symbol or disturb the sequence of symbols. A digital audio signal may be encoded for correction of any errors that occur in the storage or transmission of the signal. This technique, known as channel coding, is essential for broadcast or recorded digital systems to maintain bit accuracy, the discrete time and level of the binary signal allow a decoder to recreate the analog signal upon replay. Eight to Fourteen Bit Modulation is a code used in the audio Compact Disc. A digital audio system starts with an ADC that converts a signal to a digital signal. The ADC runs at a sampling rate and converts at a known bit resolution. CD audio, for example, has a rate of 44.1 kHz
6.
Subtitle (captioning)
–
The encoded method can either be pre-rendered with the video or separate as either a graphic or text to be rendered and overlaid by the receiver. Teletext subtitle language follows the audio, except in multi-lingual countries where the broadcaster may provide subtitles in additional languages on other teletext pages. EIA-608 captions are similar, except that North American Spanish stations may provide captioning in Spanish on CC3, DVD and Blu-ray only differ in using run-length encoded graphics instead of text, as well as some HD DVB broadcasts. Sometimes, mainly at festivals, subtitles may be shown on a separate display below the screen. Television subtitling for the deaf and hard of hearing is referred to as closed captioning in some countries. The word subtitle is the prefix followed by title. In some cases, such as opera, the dialog is displayed above the stage in what are referred to as surtitles. Today, professional subtitlers usually work with specialized software and hardware where the video is digitally stored on a hard disk. Besides creating the subtitles, the subtitler usually also tells the computer software the exact positions where each subtitle should appear and disappear, for cinema film, this task is traditionally done by separate technicians. The end result is a file containing the actual subtitles as well as position markers indicating where each subtitle should appear and disappear. These markers are based on timecode if it is a work for electronic media. For multimedia-style Webcasting, check, SMIL Synchronized Multimedia Integration Language, same-language captions, i. e. without translation, were primarily intended as an aid for people who are deaf or hard of hearing. Internationally, there are several studies which demonstrate that same-language captioning can have a major impact on literacy. This method of subtitling is used by television broadcasters in China. Same Language Subtitling is the use of Synchronized Captioning of Musical Lyrics as a Repeated Reading activity, the basic reading activity involves students viewing a short subtitled presentation projected onscreen, while completing a response worksheet. Closed captioning is the American term for closed subtitles specifically intended for people who are deaf and these are a transcription rather than a translation, and usually contain descriptions of important non-dialog audio as well such as or and lyrics. From the expression closed captions the word caption has in recent years come to mean a subtitle intended for the hard of hearing, be it open or closed. In British English subtitles usually refers to subtitles for the hard of hearing, however, programs such as news bulletins, current affairs programs, sport, some talk shows and political and special events utilize real time or online captioning
7.
Streaming media
–
Streaming media is multimedia that is constantly received by and presented to an end-user while being delivered by a provider. A client end-user can use their player to begin to play the data file before the entire file has been transmitted. For example, in the 1930s, elevator music was among the earliest popularly available streaming media, the term streaming media can apply to media other than video and audio such as live closed captioning, ticker tape, and real-time text, which are all considered streaming text. As of 2017, streaming is generally taken to refer to cases where a user watches digital video content or listens to audio content on a computer screen. With streaming content, the user does not have to download the digital video or digital audio file before they start to watch/listen to it. There are challenges with streaming content on the Internet, as of 2016, two popular streaming services are the video sharing website YouTube, which contains video and audio files on a huge range of topics and Netflix, which streams movies and TV shows. Live streaming refers to Internet content delivered in real-time, as events happen, Live internet streaming requires a form of source media, an encoder to digitize the content, a media publisher, and a content delivery network to distribute and deliver the content. Live streaming does not need to be recorded at the origination point, in the early 1920s, George O. Attempts to display media on computers date back to the earliest days of computing in the mid-20th century, however, little progress was made for several decades, primarily due to the high cost and limited capabilities of computer hardware. From the late 1980s through the 1990s, consumer-grade personal computers became powerful enough to various media. These technological improvement facilitated the streaming of audio and video content to users in their homes and workplaces. The band Severe Tire Damage was the first group to live on the Internet. On June 24,1993, the band was playing a gig at Xerox PARC while elsewhere in the building, as proof of PARCs technology, the bands performance was broadcast and could be seen live in Australia and elsewhere. Microsoft Research developed a Microsoft TV application which was compiled under MS Windows Studio Suite, realNetworks was also a pioneer in the streaming media markets, when it broadcast a baseball game between the New York Yankees and the Seattle Mariners over the Internet in 1995. The first symphonic concert on the Internet took place at the Paramount Theater in Seattle, the concert was a collaboration between The Seattle Symphony and various guest musicians such as Slash, Matt Cameron, and Barrett Martin. When Word Magazine launched in 1995, they featured the first-ever streaming soundtracks on the Internet.4 in 1999, in June 1999 Apple also introduced a streaming media format in its QuickTime 4 application. It was later widely adopted on websites along with RealPlayer. In 2000 Industryview. com launched its worlds largest streaming video archive website to help promote themselves
8.
Internet
–
The Internet is the global system of interconnected computer networks that use the Internet protocol suite to link devices worldwide. The origins of the Internet date back to research commissioned by the United States federal government in the 1960s to build robust, the primary precursor network, the ARPANET, initially served as a backbone for interconnection of regional academic and military networks in the 1980s. Although the Internet was widely used by academia since the 1980s, Internet use grew rapidly in the West from the mid-1990s and from the late 1990s in the developing world. In the two decades since then, Internet use has grown 100-times, measured for the period of one year, newspaper, book, and other print publishing are adapting to website technology, or are reshaped into blogging, web feeds and online news aggregators. The entertainment industry was initially the fastest growing segment on the Internet, the Internet has enabled and accelerated new forms of personal interactions through instant messaging, Internet forums, and social networking. Business-to-business and financial services on the Internet affect supply chains across entire industries, the Internet has no centralized governance in either technological implementation or policies for access and usage, each constituent network sets its own policies. The term Internet, when used to refer to the global system of interconnected Internet Protocol networks, is a proper noun. In common use and the media, it is not capitalized. Some guides specify that the word should be capitalized when used as a noun, the Internet is also often referred to as the Net, as a short form of network. Historically, as early as 1849, the word internetted was used uncapitalized as an adjective, the designers of early computer networks used internet both as a noun and as a verb in shorthand form of internetwork or internetworking, meaning interconnecting computer networks. The terms Internet and World Wide Web are often used interchangeably in everyday speech, however, the World Wide Web or the Web is only one of a large number of Internet services. The Web is a collection of interconnected documents and other web resources, linked by hyperlinks, the term Interweb is a portmanteau of Internet and World Wide Web typically used sarcastically to parody a technically unsavvy user. The ARPANET project led to the development of protocols for internetworking, the third site was the Culler-Fried Interactive Mathematics Center at the University of California, Santa Barbara, followed by the University of Utah Graphics Department. In an early sign of growth, fifteen sites were connected to the young ARPANET by the end of 1971. These early years were documented in the 1972 film Computer Networks, early international collaborations on the ARPANET were rare. European developers were concerned with developing the X.25 networks, in December 1974, RFC675, by Vinton Cerf, Yogen Dalal, and Carl Sunshine, used the term internet as a shorthand for internetworking and later RFCs repeated this use. Access to the ARPANET was expanded in 1981 when the National Science Foundation funded the Computer Science Network, in 1982, the Internet Protocol Suite was standardized, which permitted worldwide proliferation of interconnected networks.5 Mbit/s and 45 Mbit/s. Commercial Internet service providers emerged in the late 1980s and early 1990s, the ARPANET was decommissioned in 1990
9.
International Electrotechnical Commission
–
The IEC also manages three global conformity assessment systems that certify whether equipment, system or components conform to its International Standards. The first International Electrical Congress took place in 1881 at the International Exposition of Electricity, at that time the International System of Electrical and Magnetic Units was agreed to. The IEC was instrumental in developing and distributing standards for units of measurement, particularly Gauss, Hertz and it also first proposed a system of standards, the Giorgi System, which ultimately became the SI, or Système International d’unités. In 1938, it published a multilingual international vocabulary to unify terminology relating to electrical, electronic and this effort continues, and the International Electrotechnical Vocabulary remains an important work in the electrical and electronic industries. The CISPR – in English, the International Special Committee on Radio Interference – is one of the groups founded by the IEC, originally located in London, the commission moved to its current headquarters in Geneva in 1948. It has regional centres in Asia-Pacific, Latin America and North America, today, the IEC is the worlds leading international organization in its field, and its standards are adopted as national standards by its members. The work is done by some 10,000 electrical and electronics experts from industry, government, academia, test labs, IEC standards have numbers in the range 60000–79999 and their titles take a form such as IEC60417, Graphical symbols for use on equipment. Following the Dresden Agreement with CENELEC the numbers of older IEC standards were converted in 1997 by adding 60000, for example IEC27 became IEC60027. Standards of the 60000 series are also preceded by EN to indicate that the IEC standard is also adopted by CENELEC as a European standard. The IEC cooperates closely with the International Organization for Standardization and the International Telecommunication Union, Standards developed jointly with ISO such as ISO/IEC26300, ISO/IEC27001, and CASCO ISO/IEC17000 series, carry the acronym of both organizations. The use of the ISO/IEC prefix covers publications from ISO/IEC Joint Technical Committee 1 - Information Technology, as well as conformity assessment standards developed by ISO CASCO, other standards developed in cooperation between IEC and ISO are assigned numbers in the 80000 series, such as IEC 82045-1. IEC standards are also being adopted by other certifying bodies such as BSI, CSA, UL & ANSI/INCITS, SABS, SAI, SPC/GB, IEC standards adopted by other certifying bodies may have some noted differences from the original IEC standard. The IEC is made up of members, called national committees, national committees are constituted in different ways. Some NCs are public sector only, some are a combination of public and private sector, about 90% of those who prepare IEC standards work in industry
10.
Portable media player
–
A portable media player or digital audio player is a portable consumer electronics device capable of storing and playing digital media such as audio, images, and video files. The data is stored on a CD, DVD, flash memory, microdrive. Most portable media players are equipped with a 3.5 mm headphone jack, in contrast, analog portable audio players play music from non-digital media that use analog signal storage, such as cassette tapes or vinyl records. Often mobile digital audio players are marketed and sold as portable MP3 players, even if they support other file formats. Portable DVD players are still manufactured by brands across the world and this article focuses on portable devices that have the main function of playing media. The immediate predecessor in the place of the digital audio player was the portable CD player and prior to that. British scientist Kane Kramer invented the first digital audio player, which he called the IXI and his 1979 prototypes were capable of approximately one hour of audio playback but did not enter commercial production. His UK patent application was not filed until 1981 and was issued in 1985 in the UK and 1987 in the US. However, in 1988 Kramers failure to raise the £60,000 required to renew the patent meant it entering the public domain, but he still owns the designs. Apple Inc. hired Kramer as a consultant and presented his work as an example of art in the field of digital audio players during their litigation with Burst. com almost two decades later. At about the same time AT&T also developed an internal Web based music streaming service that had the ability to download music to FlashPAC, AAC and such music downloading services later formed the foundation for the Apple iPod and iTunes. The first portable MP3 player was launched in 1997 by Saehan Information Systems, in mid-1998, the South Korean company licensed the players for North American distribution to Eiger Labs, which rebranded them as the EigerMan F10 and F20. The flash-based players were available in 32 MB or 64 MB storage capacity and had a LCD screen to tell the user the song currently playing. The first production-volume portable digital audio player was The Audible Player from Audible. com available for sale in January 1998 and it only supported playback of digital audio in Audibles proprietary, low-bitrate format which was developed for spoken word recordings. Capacity was limited to 4 MB of internal memory, or about 2 hours of play. The unit had no display and rudimentary controls, the Rio PMP300 from Diamond Multimedia was introduced in September 1998, a few months after the MPMan, and also featured a 32 MB storage capacity. It was a success during the season, with sales exceeding expectations. Interest and investment in digital music were subsequently spurred from it, because of the players notoriety as the target of a major lawsuit, the Rio is erroneously assumed to be the first digital audio player
11.
MP4 player
–
The name MP4 player is a marketing term for inexpensive portable media players, usually from little known or generic device manufacturers. The name itself is a misnomer, since most MP4 players through 2007 were incompatible with the MPEG-4 Part 14 or the. mp4 container format, instead, the term refers to their ability to play more file types than just MP3. The Archos Jukebox Multimedia was the first commercial portable media player, todays MP4 Players can play video in a multitude of video formats without the need to pre-convert them or downsize them prior to playing them. Some MP4 Players possess USB ports in order for the users to connect it to a PC, some models also have memory cards to expand the memory of the player instead of storing files in the built-in memory. Chipsets and file formats that are particular to this kind of media player. Anyka is a chip used by many MP4 Players. It supports the same formats as Rockchip, fuzhou Rockchip Electronicss video processing Rockchip has been incorporated into many MP4 players, supporting AVI with no B frames in MPEG-4 Part 2, while MP2 audio compression is used. The clip must be padded out, if necessary, to fit the resolution of the display, any slight deviation from the supported format results in a Format Not Supported error message. Some players, like the Onda VX979+, have started to use chipsets from Ingenic, also, players with SigmaTel-based technology are compatible with SMV. The image compression algorithm of this format is inefficient by modern standards, there are a fixed range of resolutions and framerates available. A 30-minute video would have a filesize of approximately 100 MB at a 160 ×120 resolution, the MTV video format consists of a 512-byte file header that operates by displaying a series of raw image frames during MP3 playback. During this process, audio frames are passed to the chipsets decoder and this method does not require additional hardware for decoding, though it will lead to a higher amount of memory consumption. For that reason, the capacity of an MP4 player that uses MTV files is effectively less than that of a player that decompresses files on the fly. Memory card Personal video recorder Radio receiver S1 MP3 player MPEG-4 Software at DMOZ MyMPx
12.
MP3 player
–
An MP3 player or Digital Audio Player is an electronic device that can play digital audio files. It is a type of Portable Media Player, the term MP3 player is a misnomer, as most players play more than the MP3 file format. Since the MP3 format is used, almost all players can play that format. In addition, there are many digital audio formats. Some formats are proprietary, such as MP3, Windows Media Audio, some of these formats also may incorporate digital rights management, such as WMA DRM, which are often part of paid download sites. Other formats are patent-free or otherwise open, such as Vorbis, FLAC, in 1981, Kane Kramer filed for a UK patent for the IXI, the first Digital Audio Player. UK patent 2115996 was issued in 1985, and U. S, patent 4,667,088 was issued in 1987. Plans were made for a 10-minute stereo memory card and the system was at one time fitted with a drive which would have enabled over an hour of recorded digital music. However, in 1988 Kramers failure to raise the £60,000 required to renew the patent meant it entering the public domain, but he still owns the designs. In the year 1987 a German Company by the name of Fraunhofer-Gesellschaft started the program for coding music with the high quality. The project was controlled by an expert in mathematics and electronics, the first MP3 player was developed by SaeHan Information Systems in 1997. Nevertheless, the first one on the American market was the Eiger Labs F10, a 32MB portable that appeared in the summer of 1998. It was a basic unit and wasnt user expandable, though owners could upgrade the memory to 64MB by sending the player back to Eiger Labs with a check for $69.00 + $7.95 shipping. The second MP3 player needed was the Rio PMP300 from Diamond Multimedia, the Rio was a big success during the Christmas 1998 season as sales significantly exceeded expectations, spurring interest and investment in digital music. Eiger Labs and Diamond and went on to establish a new segment in the audio player market. Other early MP3 portables include Sensory Sciences Rave MP2100, the I-Jam IJ-100 and these portables were small and light, but only held enough memory to hold around 7 to 20 songs at normal 128kbit/s compression rates. As more users migrated to Win 98 by 2000, all players went USB, at the end of 1999, a company called Remote Solutions significantly broke that barrier by utilizing a laptop drive for song storage rather than low capacity flash memory. The Personal Jukebox had 4. 8GB, which held about 1200 songs and this segment eventually became the dominant type of digital music player
13.
ISO base media file format
–
ISO base media file format defines a general structure for time-based multimedia files such as video and audio. The identical text is published as ISO/IEC 15444-12 and it is designed as a flexible, extensible format that facilitates interchange, management, editing and presentation of the media. The presentation may be local, or via a network or other stream delivery mechanism, the file format is designed to be independent of any particular network protocol while enabling support for them in general. It is used as the basis for other file formats. ISO base media file format is based on Apple’s QuickTime container format. The first MP4 file format specification was created on the basis of the QuickTime format specification published in 2001, the MP4 file format known as version 1 was published in 2001 as ISO/IEC 14496-1,2001, as revision of the MPEG-4 Part 1, Systems. In 2003, the first version of MP4 file format was revised and replaced by MPEG-4 Part 14, MP4 file format, the MP4 file format was generalized into the ISO Base Media File format, which defines a general structure for time-based media files. It is used as the basis for file formats in the family such as MP4, 3GP. The ISO base media file format is designed as extensible file format, List of all registered extensions for ISO Base Media File Format is published on the official registration authority website www. mp4ra. org. The registration authority for code-points in MP4 Family files is Apple Inc. codec designers should register the codes they invent, but the registration is not mandatory and some of invented and used code-points are not registered. When someone is creating a new specification derived from the ISO base media file format, if an existing specification already covers how a particular media type is stored in the file format, that definition should be used and a new one should not be invented. The MPEG-4 Part 3 standard also defined storage of audio compression formats. Storage of MPEG-1/2 Audio in the ISO base media file format was defined in ISO/IEC 14496-3, the Advanced Video Coding file format defined support for H. 264/MPEG-4 AVC video compression. The High Efficiency Image File Format is a container format using the ISO base media file format as the basis. While HEIF can be used with any image format, it specifically includes the support for HEVC intra-coded images. Some of the above-mentioned MPEG standard extensions are used by other formats based on ISO base media file format. The 3GPP file format specification also defined extensions to support H.263 video, AMR-NB, AMR-WB, AMR-WB+ audio, the 3GPP2 file format defined extensions for usage of EVRC, SMV or 13K voice compression formats. The JPEG2000 specification defined usage of Motion JPEG2000 video compression, the DVB File Format defined by DVB Project allowed storage of DVB services in the ISO base media file format
14.
3GP and 3G2
–
3GP is a multimedia container format defined by the Third Generation Partnership Project for 3G UMTS multimedia services. It is used on 3G mobile phones but can also be played on some 2G, 3G2 is a multimedia container format defined by the 3GPP2 for 3G CDMA2000 multimedia services. It is very similar to the 3GP file format, but has some extensions and limitations in comparison to 3GP, 3GP is defined in the ETSI 3GPP technical specification. 3G2 is defined in the 3GPP2 technical specification, 3GP and 3G2 are container formats similar to MPEG-4 Part 14, which is also based on MPEG-4 Part 12. The 3GP and 3G2 file format were designed to decrease storage, the 3GP file format stores video streams as MPEG-4 Part 2, H.263, or MPEG-4 Part 10, and audio streams as AMR-NB, AMR-WB, AMR-WB+, AAC-LC, HE-AAC v1 or Enhanced aacPlus. 3GPP allowed use of AMR and H and these extensions were registered by the registration authority for code-points in ISO base media file format. For the storage of MPEG-4 media specific information in 3GP files, the 3GP specification refers to MP4 and the AVC file format, the MP4 and the AVC file format specifications described usage of MPEG-4 content in the ISO base media file format. A 3GP file is always big-endian, storing and transferring the most significant bytes first, the 3G2 file format can store the same video streams and most of the audio streams used in the 3GP file format. In addition, 3G2 stores audio streams as EVRC, EVRC-B, EVRC-WB, 13K, SMV or VMR-WB, the 3G2 specification also defined some enhancements to 3GPP Timed Text. 3G2 file format does not store Enhanced aacPlus and AMR-WB+ audio streams, for the storage of H.263 and AMR content 3G2 specification refers to the 3GP file format specification. Most 3G capable mobile phones support the playback and recording of video in 3GP format, some newer/higher-end phones without 3G capabilities may also playback and record in this format. Audio imported from CD onto a PlayStation 3 when it is set to encode to the MPEG-4 AAC format copies onto USB devices in the 3GP format, the Nintendo DSi supports. 3gp on an SD card.264. When transferred to a computer, 3GP movies can be viewed on Microsoft Windows, Apple Mac OS X and GNU/Linux operating systems, with MS Windows Media Player, Apple QuickTime and VLC media player. Programs such as Media Player Classic, K-Multimedia Player, Totem, RealPlayer, MPlayer, 3GP files can be encoded and decoded with open source software FFmpeg
15.
Digital rights management
–
Digital rights management schemes are various access control technologies that are used to restrict usage of proprietary hardware and copyrighted works. DRM technologies try to control the use, modification, and distribution of copyrighted works, the use of digital rights management is not universally accepted. Furthermore, works can become permanently inaccessible if the DRM scheme changes or if the service is discontinued, the Electronic Frontier Foundation and the Free Software Foundation consider the use of DRM systems to be an anti-competitive practice. Worldwide, many laws have been created which criminalize the circumvention of DRM, communication about such circumvention, such laws are part of the United States Digital Millennium Copyright Act, and the European Unions Copyright Directive. The term DRM is also referred to as copy protection, technical protection measures, copy prevention, or copy control. The advent of digital media and analog-to-digital conversion technologies has vastly increased the concerns of copyright-owning individuals and these concerns are particularly prevalent within the music and movie industries, because these sectors are partly or wholly dependent on the revenue generated from such works. This, combined with the Internet and popular file-sharing tools, has made unauthorized distribution of copies of copyrighted digital media much easier, DRM technologies enable content publishers to enforce their own access policies on content, such as restrictions on copying or viewing. These technologies have been criticized for restricting individuals from copying or using the content legally, DRM is in common use by the entertainment industry. However, Apple dropped DRM from all iTunes music files around 2009, for instance, tractor companies try to prevent the DIY repairing by the owning farmers under usage of DRM-laws as DMCA. Digital Rights Management Techniques include, Restrictive Licensing Agreements, The access to materials, copyright. Some restrictive licenses are imposed on consumers as a condition of entering a website or when downloading software, encryption, Scrambling of expressive material and embedding of a tag, This technology is designed to control access and reproduction of information. This includes backup copies for personal use, computer games sometimes use DRM technologies to limit the number of systems the game can be installed on by requiring authentication with an online server. Most games with this restriction allow three or five installs, although some allow an installation to be recovered when the game is uninstalled. In mid-2008, the publication of Mass Effect marked the start of a wave of titles primarily making use of SecuROM for DRM, the use of the DRM scheme in 2008s Spore backfired and there were protests, resulting in a considerable number of users seeking an unlicensed version instead. This backlash against the limit was a significant factor in Spore becoming the most pirated game in 2008. Additionally, other games that use intrusive DRM such as BioShock, Crysis Warhead. Although Ubisoft has not commented on the results of the experiment, Ubisoft formally announced a return to online authentication on 9 February 2010, through its Uplay online gaming platform, starting with Silent Hunter 5, The Settlers 7, and Assassins Creed II. Silent Hunter 5 was first reported to have been compromised within 24 hours of release, the Uplay system works by having the installed game on the local PCs incomplete and then continuously downloading parts of the game-code from Ubisofts servers as the game progresses
16.
ITunes Store
–
ITunes Store is a software-based online digital media store operated by Apple Inc. It opened on April 28,2003, and has been the largest music vendor in the United States since April 2008, and the largest music vendor in the world since February 2010. It offers over 35 -40 million songs,2.2 million apps,25,000 TV shows, iTunes Stores revenues in the first quarter of 2011 totaled nearly US$1.4 billion, by May 28,2014, the store had sold 35 billion songs worldwide. On January 6,2009, Apple announced that DRM had been removed from 80% of its catalog in the US. As of June 2013, iTunes Store possesses 575 million active user accounts, before iTunes Store, most of the online music was download through websites like Napster. Steve Jobs expressed concern that people were illegally obtaining music because it was the option they had. In 2002, Steve Jobs made an agreement with the five major record labels to offer their content through iTunes, iTunes Store was introduced by Steve Jobs at a Worldwide Developers Conference to give music listeners a legal alternative to peer-to-peer file sharing networks. When it opened, it was the only legal digital catalog of music to songs from all five major record labels. At first, it was available on Mac OS X. Following the introduction of iTunes Store, individual songs were all sold for the same price, Music in the store is in the Advanced Audio Coding format, which is the MPEG-4-specified successor to MP3. Originally, songs were available with DRM and were encoded at 128 kbit/s. At the January 2009 Macworld Expo, Apple announced that all music would be made available without DRM. Previously, this model, known as iTunes Plus, had available only for music from EMI. Users can sample songs by listening to previews, ninety seconds in length, some Apps cost money and some are free. Developers can decide which prices they want to charge for apps, from a pre-set list of pricing tiers, when someone downloads an App,70 percent of the purchase goes to the developer, and 30 percent goes to Apple. At the Macworld 2008 keynote, Steve Jobs, who was Apples CEO at the time, movies are available for rent in iTunes Store on the same day they are released on DVD, though iTunes Store also offers for rental some movies that are still in theaters. Movie rentals are only viewable for 24 hours or 48 hours after users begin viewing them, iTunes Store also offers one low-priced movie rental a week, in the United States, this rental costs 99 cents. Movie rentals are not yet available in all countries but it is available in the United States, Mexico, there is a weekly promotion in which one to three songs are available to download for free to logged-in users
17.
Audiobook
–
An audiobook is a recording of a text being read. A reading of the text is noted as unabridged, while readings of a reduced version. Spoken audio has been available in schools and public libraries and to an extent in music shops since the 1930s. Many spoken word albums were made prior to the age of videocassettes, DVDs, compact discs and it was not until the 1980s that the medium began to attract book retailers, and then book retailers started displaying audiobooks on bookshelves rather than in separate displays. In 1994, the Audio Publishers Association established the term audiobook as the industry standard, Spoken word recordings first became possible with the invention of the phonograph by Thomas Edison in 1877. Phonographic books were one of the original applications envisioned by Edison which would speak to people without effort on their part. The initial words spoken into the phonograph were Edisons recital of Mary Had a Little Lamb, one early listener complained that he would need a wheelbarrow to carry around talking books recorded on discs with such limited storage capacity. By the 1930s close-grooved records increased to 20 minutes making possible longer narrative, the first test recordings in 1932 included a chapter from Helen Kellers Midstream and Edgar Allan Poes The Raven. The organization received approval for exemption from copyright and free postal distribution of talking books. M. Delafield, Cora Jarrett, Rudyard Kipling, John Masefield, Macdonald mobilized the women of the Auxiliary under the motto Education is a right, not a privilege. In 1952, Macdonald established recording studios in seven cities across the United States. Caedmon Records was a pioneer in the business, it was the first company dedicated to selling spoken work recordings to the public and has been called the seed of the audiobook industry. Caedmon was formed in New York in 1952 by college graduates Barbara Holdridge and their first release was a collection of poems by Dylan Thomas as read by the author. The original 1952 recording was a selection for the 2008 United States National Recording Registry, Listening Library was also a pioneering company, it was one of the first to distribute childrens audiobooks to schools, libraries and other special markets, including VA hospitals. It was founded by Anthony Ditlow and his wife in 1955 in their Red Bank, New Jersey home, like Caedemon, Listening Library and Spoken Arts benefited from the new technology of LPs, but also increased governmental funding for schools and libraries beginning in the 1950s and 60s. Cassette tapes were invented in 1963 and a few libraries, such as the Library of Congress, however, during the 1970s, a number of technological innovations allowed the cassette tape wider usage in libraries and also spawned the creation of new commercial audiobook market. In the early 1970s, instructional recordings were among the first commercial products sold on cassette, there were 8 companies distributing materials on cassette with titles such as Managing and Selling Companies and Executive Seminar in Sound on a series of 60-minute cassettes. His company, the Maryland-based Recorded Books, followed the model of Books on Tape but with higher quality studio recordings, Recorded Books and Chivers Audio Books were the first to develop integrated production teams and to work with professional actors
18.
Podcast
–
The word arose as a portmanteau of iPod and broadcast. Thus, the files distributed are typically in audio or video formats, the distributor of a podcast maintains a central list of the files on a server as a web feed that can be accessed through the Internet. This process can be automated so that new files are downloaded automatically, files are stored locally on the users device, ready for offline use. Podcasting contrasts with webcasting or streaming which do not allow for offline listening, many podcast players allow listeners to adjust the playback speed. Podcasts are usually free of charge to listeners and can often be created for little to no cost and it is very much a horizontal media form, producers are consumers, consumers may become producers, and both can engage in conversations with each other. Podcast is a portmanteau, invented by BBC journalist Ben Hammersley in 2004, of the words pod — from iPod, despite the etymology, the content can be accessed using any computer or similar device that can play media files. Use of the term podcast predated Apples addition of support for podcasting to the iPod. Other names for podcasting include net cast, intended as a term without the loose reference to the Apple iPod. The name is used by shows from the TWiT. tv network, some sources have suggested the backronym portable on demand for POD, for similar reasons. Podcasting, once a method of spreading information, has become a recognized medium for distributing audio content. Podcasts are similar to programs, but they are audio files. Listeners can play them at their convenience, using devices that have more common than portable broadcast receivers. The first application to make this process feasible was iPodderX, developed by August Trometer, by 2007, audio podcasts were doing what was historically accomplished via radio broadcasts, which had been the source of radio talk shows and news programs since the 1930s. This shift occurred as a result of the evolution of internet capabilities along with increased access to cheaper hardware and software for audio recording and editing. In August 2004, Adam Curry launched his show Daily Source Code and it was a show focused on chronicling his everyday life, delivering news and discussions about the development of podcasting, as well as promoting new and emerging podcasts. Daily Source Code is believed to be the first podcast produced on a consistent basis, Curry published it in an attempt to gain traction in the development of what would come to be known as podcasting and as a means of testing the software outside of a lab setting. The name Daily Source Code was chosen in the hope that it would attract an audience with an interest in technology, Daily Source Code started at a grassroots level of production and was initially directed at podcast developers. As its audience became interested in the format, these developers were inspired to create and produce their own projects and, as a result, as more people learned how easy it was to produce podcasts, a community of pioneer podcasters quickly appeared
19.
IPhone
–
IPhone is a line of smartphones designed and marketed by Apple Inc. They run Apples iOS mobile operating system, the first generation iPhone was released on June 29,2007, the most recent iPhone model is the iPhone 7, which was unveiled at a special event on September 7,2016. The user interface is built around the devices multi-touch screen, including a virtual keyboard, the iPhone has Wi-Fi and can connect to cellular networks. Other functionality, such as games, reference works, and social networking. As of January 2017, Apples App Store contained more than 2.2 million applications available for the iPhone, Apple has released ten generations of iPhone models, each accompanied by one of the ten major releases of the iOS operating system. The iPhone 5 featured a taller, 4-inch display and Apples newly introduced Lightning connector, in 2013, Apple released the 5S with improved hardware and a fingerprint reader, and the lower-cost 5C, a version of the 5 with colored plastic casings instead of metal. They were followed by the larger iPhone 6, with models featuring 4.7 and 5. 5-inch displays.5 mm headphone jack found on previous phones. The iPhones commercial success has been credited with reshaping the smartphone industry, the original iPhone was one of the first phones to use a design featuring a slate format with a touchscreen interface. Almost all modern smartphones have replicated this style of design, in the US, the iPhone holds the largest share of the smartphone market. As of late 2015, the iPhone had a 43. 6% market share, followed by Samsung, LG, Apple CEO Steve Jobs steered the original focus away from a tablet and towards a phone. Apple created the device during a collaboration with Cingular Wireless at the time—at an estimated development cost of US$150 million over thirty months. Apple rejected the design by committee approach that had yielded the Motorola ROKR E1, among other deficiencies, the ROKR E1s firmware limited storage to only 100 iTunes songs to avoid competing with Apples iPod nano. Jobs unveiled the iPhone to the public on January 9,2007, the passionate reaction to the launch of the iPhone resulted in sections of the media dubbing it the Jesus phone. Following this successful release in the US, the first generation iPhone was made available in the UK, France, and Germany in November 2007, on July 11,2008, Apple released the iPhone 3G in twenty-two countries, including the original six. Apple released the iPhone 3G in upwards of eighty countries and territories. Apple announced the iPhone 3GS on June 8,2009, along with plans to release it later in June, July, many would-be users objected to the iPhones cost, and 40% of users had household incomes over US$100,000. The back of the original first generation iPhone was made of aluminum with a black plastic accent, the iPhone 3G and 3GS feature a full plastic back to increase the strength of the GSM signal. The iPhone 3G was available in an 8 GB black model, the iPhone 3GS was available in both colors, regardless of storage capacity
20.
Mobile phone
–
A mobile phone is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area. The radio frequency link establishes a connection to the systems of a mobile phone operator. Most modern mobile telephone services use a network architecture, and, therefore. Mobile phones which offer these and more general computing capabilities are referred to as smartphones, the first handheld mobile phone was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using a handset weighing c.4.4 lbs. In 1983, the DynaTAC 8000x was the first commercially available mobile phone. From 1983 to 2014, worldwide mobile phone subscriptions grew to seven billion, penetrating 100% of the global population. In first quarter of 2016, the top smartphone manufacturers were Samsung, Apple, a handheld mobile radio telephone service was envisioned in the early stages of radio engineering. In 1917, Finnish inventor Eric Tigerstedt filed a patent for a pocket-size folding telephone with a thin carbon microphone. Early predecessors of cellular phones included analog radio communications from ships, the race to create truly portable telephone devices began after World War II, with developments taking place in many countries. These 0G systems were not cellular, supported few simultaneous calls, the first handheld mobile phone was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using a handset weighing c.4.4 lbs. The first commercial automated cellular network was launched in Japan by Nippon Telegraph and this was followed in 1981 by the simultaneous launch of the Nordic Mobile Telephone system in Denmark, Finland, Norway, and Sweden. Several other countries followed in the early to mid-1980s. These first-generation systems could support far more simultaneous calls but still used analog cellular technology, in 1983, the DynaTAC 8000x was the first commercially available handheld mobile phone. In 1991, the digital cellular technology was launched in Finland by Radiolinja on the GSM standard. This sparked competition in the sector as the new operators challenged the incumbent 1G network operators, ten years later, in 2001, the third generation was launched in Japan by NTT DoCoMo on the WCDMA standard. This was followed by 3. 5G, 3G+ or turbo 3G enhancements based on the high-speed packet access family, allowing UMTS networks to have data transfer speeds. By 2009, it had become clear that, at point, 3G networks would be overwhelmed by the growth of bandwidth-intensive applications. Consequently, the industry began looking to data-optimized fourth-generation technologies, with the promise of speed improvements up to ten-fold over existing 3G technologies
21.
File manager
–
A file manager or file browser is a computer program that provides a user interface to manage files and folders. Folders and files may be displayed in a tree based on their directory structure. Some file managers contain features inspired by web browsers, including forward, some file managers provide network connectivity via protocols, such as FTP, NFS, SMB or WebDAV. This is achieved by allowing the user to browse for a server or by providing its own full client implementations for file server protocols. A term that predates the usage of file manager is directory editor, the term was used by other developers, including Jay Lepreau, who wrote the dired program in 1980, which ran on BSD. This was in inspired by an older program with the same name running on TOPS-20. Dired inspired other programs, including dired, the editor script, file-list file managers are lesser known and older than orthodox file managers. One such file manager is flist, which was first used in 1981 on the Conversational Monitor System and this is a variant of fulist, which originated before late 1978, according to comments by its author, Theo Alkema. The flist program provided a list of files in the users minidisk, the file attributes could be passed to scripts or function-key definitions, making it simple to use flist as part of CMS EXEC, EXEC2 or XEDIT scripts. Orthodox file managers or command-based file managers are text-menu based file managers, Orthodox file managers are one of the longest running families of file managers, preceding Graphical User Interface-based types. Developers create applications that duplicate and extend the manager that was introduced by PathMinder, the concept is more than thirty years old—PathMinder was released in 1984, and Norton Commander version 1.0 was released in 1986. Despite the age of this concept, file managers based on Norton Commander are actively developed, and dozens of implementations exist for DOS, Unix, Nikolai Bezroukov publishes his own set of criteria for an OFM standard. An orthodox file manager typically has three windows, two of the windows are called panels and are positioned symmetrically at the top of the screen. The third is the line, which is essentially a minimized command window that can be expanded to full screen. Only one of the panels is active at a given time, the active panel contains the file cursor. Panels are resizable and can be hidden, files in the active panel serve as the source of file operations performed by the manager. For example, files can be copied or moved from the panel to the location represented in the passive panel. This scheme is most effective for systems in which the keyboard is the primary or sole input device, the active panel shows information about the current working directory and the files that it contains
22.
File Explorer
–
File Explorer, previously known as Windows Explorer, is a file manager application that is included with releases of the Microsoft Windows operating system from Windows 95 onwards. It provides a user interface for accessing the file systems. It is also the component of the system that presents many user interface items on the monitor such as the taskbar. Controlling the computer is possible without Windows Explorer running, Windows Explorer was first included with Windows 95 as a replacement for File Manager, which came with all versions of Windows 3. x operating systems. Explorer could be accessed by double-clicking the new My Computer desktop icon, there is also a shortcut key combination, Windows key + E. Collectively, these features are known as the Windows shell. After a user logs in, the process is created by userinit process. Userinit performs some initialization of the environment and then looks in the registry at the Shell value and creates a process to run the system-defined shell – by default. This is why Explorer. exe is shown by various process explorers with no parent – its parent has exited, in 1995, Microsoft first released test versions of a shell refresh, named the Shell Technology Preview, and often referred to informally as NewShell. The update was designed to replace the Windows 3. x Program Manager/File Manager based shell with Windows Explorer, the release provided capabilities quite similar to that of the Windows Chicago shell during its late beta phases, however was intended to be nothing more than a test release. There were two releases of the Shell Technology Preview, made available to MSDN and CompuServe users,26 May 1995 and 8 August 1995. Both held Windows Explorer builds of 3.51.1053.1, the Shell Technology Preview program never saw a final release under NT3.51. The entire program was moved across to the Cairo development group who finally integrated the new design into the NT code with the release of NT4.0 in July 1996. At the time these changes raised antitrust concerns about the incorporation of what was seen as an application feature, an address bar was also added to Windows Explorer, which a user could type in directory paths directly, and be taken to that folder. It also operated as a URL bar for Internet addresses, web pages would open in the portion of the window. Another feature that was based on Internet Explorer technology was customized folders, such folders contained a hidden web page that controlled the way the Windows Explorer displayed the contents of the folder. This feature proved to have security due to its reliance on ActiveX objects and scripting. Other new features, The ability to add toolbars to the task bar. Active Desktop, which made it possible to turn the desktop background itself into a web page, single-click activation of icons in Windows Explorer, adhering to a web page paradigm
23.
Lossy compression
–
In information technology, lossy compression or irreversible compression is the class of data encoding methods that uses inexact approximations and partial data discarding to represent the content. These techniques are used to reduce data size for storage, handling, different versions of the photo of the cat above show how higher degrees of approximation create coarser images as more details are removed. This is opposed to data compression which does not degrade the data. The amount of data reduction possible using lossy compression is often higher than through lossless techniques. Well-designed lossy compression technology often reduces file sizes significantly before degradation is noticed by the end-user, even when noticeable by the user, further data reduction may be desirable. Lossy compression is most commonly used to compress multimedia data, especially in such as streaming media. By contrast, lossless compression is required for text and data files, such as bank records. A picture, for example, is converted to a file by considering it to be an array of dots and specifying the color. If the picture contains an area of the color, it can be compressed without loss by saying 200 red dots instead of red dot. The original data contains an amount of information, and there is a lower limit to the size of file that can carry all the information. Basic information theory says there is an absolute limit in reducing the size of this data. When data is compressed, its entropy increases, and it cannot increase indefinitely, as an intuitive example, most people know that a compressed ZIP file is smaller than the original file, but repeatedly compressing the same file will not reduce the size to nothing. Most compression algorithms can recognize when further compression would be pointless, in many cases, files or data streams contain more information than is needed for a particular purpose. Developing lossy compression techniques as closely matched to human perception as possible is a complex task, the terms irreversible and reversible are preferred over lossy and lossless respectively for some applications, such as medical image compression, to circumvent the negative implications of loss. The type and amount of loss can affect the utility of the images, artifacts or undesirable effects of compression may be clearly discernible yet the result still useful for the intended purpose. Or lossy compressed images may be visually lossless, or in the case of medical images and this is because uncompressed audio can only reduce file size by lowering bit rate or depth, whereas compressing audio can reduce size while maintaining bit rate and depth. This compression becomes a loss of the least significant data. From this point of view, perceptual encoding is not essentially about discarding data, green, and 50 pixels of blue vs. red, which are proportional to human sensitivity to each component
24.
MPEG-2
–
MPEG-2 is a standard for the generic coding of moving pictures and associated audio information. MPEG-2 is widely used as the format of television signals that are broadcast by terrestrial, cable. It also specifies the format of movies and other programs that are distributed on DVD, TV stations, TV receivers, DVD players, and other equipment are often designed to this standard. MPEG-2 was the second of several developed by the Moving Pictures Expert Group and is an international standard. Parts 1 and 2 of MPEG-2 were developed in a collaboration with ITU-T, while MPEG-2 is the core of most digital television and DVD formats, it does not completely specify them. Regional institutions can adapt it to their needs by restricting and augmenting aspects of the standard, MPEG-2 includes a Systems section, part 1, that defines two distinct, but related, container formats. Program stream exceptions are M2TS, which is used on Blu-ray discs, AVCHD on re-writable DVDs, while VOB on DVDs and Enhanced VOB on the short lived HD DVD do not waste storage space and just use the program stream. MPEG-2 Systems is formally known as ISO/IEC 13818-1 and as ITU-T Rec, ISO authorized the SMPTE Registration Authority, LLC as the registration authority for MPEG-2 format identifiers. This provision will permit the MPEG-2 transport standard to all types of data while providing for a method of unambiguous identification of the characteristics of the underlying private data. The Video section, part 2 of MPEG-2, is similar to the previous MPEG-1 standard, but also support for interlaced video. MPEG-2 video is not optimized for low bit-rates, especially less than 1 Mbit/s at standard definition resolutions, all standards-compliant MPEG-2 Video decoders are fully capable of playing back MPEG-1 Video streams conforming to the Constrained Parameters Bitstream syntax. MPEG-2/Video is formally known as ISO/IEC 13818-2 and as ITU-T Rec, with some enhancements, MPEG-2 Video and Systems are also used in some HDTV transmission systems, and is the standard format for over-the-air ATSC digital television.1 multichannel. This method is backwards-compatible, allowing MPEG-1 audio decoders to decode the two main components of the presentation. MPEG-2 part 3 also defined additional bit rates and sample rates for MPEG-1 Audio Layer I, MPEG-2 BC low bitrate encoding with halved sampling rate multichannel encoding with up to 5.1 channels, a. k. a. MPEG Multichannel Part 7 of the MPEG-2 standard specifies a rather different, Part 7 is referred to as MPEG-2 AAC. AAC is more efficient than the previous MPEG audio standards, and is in some ways less complicated than its predecessor, MPEG-1 Audio, Layer 3, in that it does not have the hybrid filter bank. It supports from 1 to 48 channels at sampling rates of 8 to 96 kHz, with multichannel, multilingual, advanced Audio is also defined in Part 3 of the MPEG-4 standard. MPEG-2 NBC MPEG-2 AAC multichannel encoding with up to 48 channels MPEG-2 standards are published as parts of ISO/IEC13818, each part covers a certain aspect of the whole specification
25.
MPEG-1
–
MPEG-1 is a standard for lossy compression of video and audio. Today, MPEG-1 has become the most widely compatible lossy audio/video format in the world, perhaps the best-known part of the MPEG-1 standard is the MP3 audio format it introduced. The MPEG-1 standard is published as ISO/IEC11172 – Information technology—Coding of moving pictures, MPEG was formed to address the need for standard video and audio formats, and to build on H.261 to get better quality through the use of more complex encoding methods. Development of the MPEG-1 standard began in May 1988, fourteen video and fourteen audio codec proposals were submitted by individual companies and institutions for evaluation. The codecs were extensively tested for computational complexity and subjective quality and this specific bitrate was chosen for transmission over T-1/E-1 lines and as the approximate data rate of audio CDs. The codecs that excelled in testing were utilized as the basis for the standard and refined further, with additional features. The reported completion date of the MPEG-1 standard varies greatly, a complete draft standard was produced in September 1990. The draft standard was publicly available for purchase, the standard was finished with the 6 November 1992 meeting. The Berkeley Plateau Multimedia Research Group developed an MPEG-1 decoder in November 1992, due in part to the similarity between the two codecs, the MPEG-2 standard includes full backwards compatibility with MPEG-1 video, so any MPEG-2 decoder can play MPEG-1 videos. This means that MPEG-1 coding efficiency can vary depending on the encoder used. The first three parts of ISO/IEC11172 were published in August 1993, the ISO patent database lists one patent for ISO11172, US4,472,747, which expired in 2003. The near-complete draft of the MPEG-1 standard was publicly available as ISO CD11172 by December 6,1991, a May 2009 discussion on the whatwg mailing list mentioned US5,214,678 patent as possibly covering MPEG audio layer II. Filed in 1990 and published in 1993, this patent is now expired, most popular software for video playback includes MPEG-1 decoding, in addition to any other supported formats. The popularity of MP3 audio has established a massive installed base of hardware that can play back MPEG-1 Audio, virtually all digital audio devices can play back MPEG-1 Audio. Many millions have been sold to-date, before MPEG-2 became widespread, many digital satellite/cable TV services used MPEG-1 exclusively. The widespread popularity of MPEG-2 with broadcasters means MPEG-1 is playable by most digital cable and satellite set-top boxes, MPEG-1 was used for full-screen video on Green Book CD-i, and on Video CD. The Super Video CD standard, based on VCD, uses MPEG-1 audio exclusively, the DVD-Video format uses MPEG-2 video primarily, but MPEG-1 support is explicitly defined in the standard. The DVD-Video standard originally required MPEG-1 Layer II audio for PAL countries, MPEG-1 Layer II audio is still allowed on DVDs, although newer extensions to the format, like MPEG Multichannel, are rarely supported
26.
MPEG-4 Part 3
–
MPEG-4 Part 3 or MPEG-4 Audio is the third part of the ISO/IEC MPEG-4 international standard developed by Moving Picture Experts Group. The first version of ISO/IEC 14496-3 was published in 1999, MPEG-4 Audio does not target a single application such as real-time telephony or high-quality audio compression. It applies to every application which requires the use of advanced sound compression, synthesis, manipulation, each format is assigned a unique Audio Object Type to represent it. Object Type is used to distinguish between different coding methods and it directly determines the MPEG-4 tool subset required to decode a specific object. The MPEG-4 profiles are based on the types and each profile supports different list of object types. The MPEG-4 Audio standard defines several profiles and these profiles are based on the object types and each profile supports different list of object types. Each profile may also have levels, which limit some parameters of the tools present in a profile. These parameters usually are the rate and the number of audio channels decoded at the same time. The capabilities of a layer and the communication between transport, multiplex, and demultiplex functions are described in the Delivery Multimedia Integration Framework in ISO/IEC 14496-6. A wide variety of mechanisms exist below this interface, e. g. MPEG transport stream, Real-time Transport Protocol. Transport in Real-time Transport Protocol is defined in RFC3016, RFC3640, RFC4281, LATM and LOAS were defined for natural audio applications, which do not require sophisticated object-based coding or other functions provided by MPEG-4 Systems. The Advanced Audio Coding in MPEG-4 Part 3 Subpart 4 was enhanced relative to the previous standard MPEG-2 Part 7, in order to provide better sound quality for a given encoding bitrate. It is assumed that any Part 3 and Part 7 differences will be ironed out by the ISO standards body in the future to avoid the possibility of future bitstream incompatibilities. At present there are no player or codec incompatibilities due to the newness of the standard. The MPEG-2 Part 7 standard was first published in 1997 and offers three default profiles, Low Complexity profile, Main profile and Scalable Sampling Rate profile. The MPEG-4 Part 3 Subpart 4 combined the profiles from MPEG-2 Part 7 with Perceptual Noise Substitution, high-Efficiency Advanced Audio Coding is an extension of AAC LC using spectral band replication, and Parametric Stereo. It is designed to increase coding efficiency at low bitrates by using partial parametric representation of audio, AAC Scalable Sample Rate was introduced by Sony to the MPEG-2 Part 7 and MPEG-4 Part 3 standards. It was first published in ISO/IEC 13818-7, Part 7, Advanced Audio Coding in 1997, the audio signal is first split into 4 bands using a 4 band polyphase quadrature filter bank
