Acoustic location is the use of sound to determine the distance and direction of its source or reflector. Location can be done or passively, can take place in gases, in solids. Active acoustic location involves the creation of sound in order to produce an echo, analyzed to determine the location of the object in question. Passive acoustic location involves the detection of sound or vibration created by the object being detected, analyzed to determine the location of the object in question. Both of these techniques, when used in water, are known as sonar. Acoustic mirrors and dishes, when using microphones, are a means of passive acoustic localization, but when using speakers are a means of active localization. More than one device is used, the location is triangulated between the several devices; as a military air defense tool, passive acoustic location was used from mid-World War I to the early years of World War II to detect enemy aircraft by picking up the noise of their engines. It was rendered obsolete before and during World War II by the introduction of radar, far more effective.
Acoustic techniques had the advantage that they could'see' around corners and over hills, due to sound diffraction. The civilian uses include locating the shooting position of a firearm. Acoustic source localization is the task of locating a sound source given measurements of the sound field; the sound field can be described using physical quantities like sound pressure and particle velocity. By measuring these properties it is possible to obtain a source direction. Traditionally sound pressure is measured using microphones. Microphones have a polar pattern describing their sensitivity as a function of the direction of the incident sound. Many microphones have an omnidirectional polar pattern which means their sensitivity is independent of the direction of the incident sound. Microphones with other polar patterns exist; this however is still no solution for the sound localization problem as one tries to determine either an exact direction, or a point of origin. Besides considering microphones that measure sound pressure, it is possible to use a particle velocity probe to measure the acoustic particle velocity directly.
The particle velocity is another quantity related to acoustic waves however, unlike sound pressure, particle velocity is a vector. By measuring particle velocity one obtains a source direction directly. Other more complicated methods using multiple sensors are possible. Many of these methods use the time difference of arrival technique; some have termed acoustic source localization an "inverse problem" in that the measured sound field is translated to the position of the sound source. Different methods for obtaining either source direction or source location are possible; the simplest but still a new method is to measure the acoustic particle velocity using a particle velocity probe. The particle velocity is a vector and thus contains directional information; the traditional method to obtain the source direction is using the time difference of arrival method. This method can be used with pressure microphones as well as with particle velocity probes. With a sensor array consisting of at least two probes it is possible to obtain the source direction using the cross-correlation function between each probes' signal.
The cross-correlation function between two microphones is defined as R x 1, x 2 = ∑ n = − ∞ ∞ x 1 x 2 which defines the level of correlation between the outputs of two sensors x 1 and x 2. In general, a higher level of correlation means that the argument τ is close to the actual time-difference-of-arrival. For two sensors next to each other the TDOA is given by τ true = d spacing c where c is the speed of sound in the medium surrounding the sensors and the source. A well-known example of TDOA is the interaural time difference; the interaural time difference is the difference in arrival time of a sound between two ears. The interaural time difference is given by Δ t = x cos θ c where Δ t is the time difference in seconds, x is the distance between the two sensors in meters, θ is the angle between the baseline of the sensors and the incident sound, in degrees. In trigonometry and geometry, triangulation is the process of determining the location of a point by measuring angles to it from known points at either end of a fixed baseline, rather than measuring distances to the point directly.
The point can be fixed as the third point of a triangle with one known side and two known angles
Follow You Home
"Follow You Home" is a song written by Danny McNamara and Richard McNamara of the English alternative rock band Embrace. The song was recorded by the band for their eponymous sixth studio album, where it appears as the fifth track on the album. A "Follow You Home" promotional single, featuring the Embrace track of the same name, was released to UK radio on 10 March 2014 by Cooking Vinyl; the single serves as the third overall release in promotion of Embrace, after promotional single "Refugees" and the extended play Refugees. The radio single art for "Follow You Home" continues the graffiti motif; the artwork features a multi-layered painting, with the word "Follow", painted in black, being the central focus of the artwork. It prominently features Shades of orange, as opposed to the variations of gray featured in the artwork to "Refugees"; the promotional single itself features a black border, with the artwork itself being overwritten by "Embrace" and "Follow You Home" in a black rectangle, obscuring most of the artwork.
"Follow You Home", alongside the promotional single release to UK radio, was made available early on the iTunes Store through Embrace beginning 11 March 2014, becoming the second track from the album, after third track "Refugees", to be released. A music video for "Follow You Home" was produced by the band to accompany the release of the track; the music video was premiered on music video hosting service Vevo on 30 March 2014. The three-and-a-half minute video prominently features lead singer Danny McNamara walking through the streets of London while singing along to the lyrics of the song; the video begins with a woman writing on Danny's hand, walking away. Danny proceeds to walk home through the streets of London, setting off car alarms and spraying an aerosol paint canister on a wall in the meantime, he comes home to discover that the woman had written the number five in stroke counting form, before the same woman comes and knocks on his front door. Principal photography for the video took place on the night of 12 March 2014 in South London.
The band used crowdsourcing in order to obtain six cars to use as props during the filming of the music video. The cars were used to film a scene where Danny intentionally sets off car alarms by running into the cars. Adapted from Embrace liner notes. EmbraceMickey Dale – keyboards, backing vocals Steve Firth – bass Mike Heaton – drum kit, backing vocals Danny McNamara – lead vocals Richard McNamara – guitar, backing vocals
Acoustic (Joey Cape and Tony Sly album)
Acoustic is an acoustic alternative album by punk rock singers Joey Cape and Tony Sly, released on May 18, 2004, through Fat Wreck Chords. The album features 12 songs, 10 of them are acoustic renditions of songs by the singers' respective bands - Lagwagon and No Use for a Name, with each member contributing one unreleased song. Although each singer went on to a solo career and to record a solo acoustic/folk album on his own, this is the first solo album for both Cape and Sly; the album has been described as "punk rock's answer to Simon and Garfunkel."Contributors on the album include Angus Cooke of the Ataris on bass guitar & cello, Brian Mann of Vampire Lovers on accordion, Todd Capps of Bad Astronaut on piano & mellotron, George Pendergast of Dishwalla on congas, Thomas Flowers of Oleander on banjo, Tim Cullen of Summercamp and Jon Snodgrass of Drag the River on backing vocals. Joey Cape – lead vocals, acoustic guitar, percussion Tony Sly – lead vocals, acoustic guitar, percussion Angus Cooke – cello, percussion Thomas Flowers – banjo Brian Mann – accordion Todd Capps – piano, mellotron, vibraphone George Pendergast – congas, djembe Tim Cullen – backing vocals on "Wind in Your Sails" Jon Snodgrass – backing vocalsAdditional personnelRyan Greene – mixing Tony Sly – arrangements
Acoustic bass guitar
The acoustic bass guitar is a bass instrument with a hollow wooden body similar to, though larger than a steel-string acoustic guitar. Like the traditional electric bass guitar and the double bass, the acoustic bass guitar has four strings, which are tuned E-A-D-G, an octave below the lowest four strings of the 6-string guitar, the same tuning pitch as an electric bass guitar; because it can sometimes be difficult to hear an acoustic bass guitar without an amplifier in settings with other acoustic instruments, most acoustic basses have pickups, either magnetic or piezoelectric or both, so that they can be amplified with a bass amp. Traditional music of Mexico features several varieties of acoustic bass guitars, such as the guitarrón, a large, deep-bodied Mexican 6-string acoustic bass guitar played in Mariachi bands, the león, plucked with a pick, the bajo sexto, with six pairs of strings; the first modern acoustic bass guitar was developed in the mid-1950s by Kay of Chicago Harpone started producing their B4 model in 1965 under the name Supreme.
In 1967 Harptone started producing the B4 under their name production ended in 1975. Note, they made a limited number under the Standel logo. Ernie Ball of San Luis Obispo, began producing a model in the early 70's. Ball's aim was to provide bass guitarists with a more acoustic-sounding instrument that would match better with the sound of acoustic guitars. Ball stated that "...if there were electric bass guitars to go with electric guitars you ought to have acoustic basses to go with acoustic guitars." Ball notes that "...the closest thing to an acoustic bass was the Mexican guitarron...in mariachi bands, so I bought one down in Tijuana and tinkered with it."Ball collaborated with George Fullerton, a former employee at Fender, to develop the Earthwood acoustic bass guitar, introduced in 1972. Production of this instrument ceased in 1974, resuming a few years under the direction of Ernie Ball's employee Dan Norton, until production ended again in 1985; the Earthwood acoustic bass guitar was quite large in contrast to most instruments in current production, which gave it more volume in the low register.photo 1photo 2photo 3 The Ernie Ball company describes Ball's design as "an idea before its time".
The Earthwood was supplanted by the Washburn AB-40 designed by Mick Donner and Richard Siegle. The AB-40 and the more affordable AB-20 became the instrument of choice for bass players appearing on Unplugged. Folk bass player Ashley Hutchings used the acoustic bass guitar with his Etchingham Steam Band in 1974 and 1975. An early user of the acoustic bass guitar in rock was English multi-instrumentalist and composer Mike Oldfield, who had one custom-built for him by luthier Tony Zemaitis in the mid-1970s. Mike used the bass on a number of his recordings from that time onwards, a prominent example being his 1975 album Ommadawn. Brian Ritchie of Violent Femmes was an early user of acoustic bass guitars. Unlike the electric bass guitar, a solid body instrument, the acoustic bass guitar has a hollow wooden body similar to that of the steel-string acoustic guitar; the majority of acoustic basses are fretted. Semi-fretted versions exist, although they are quite rare. Like the traditional electric bass and the double bass, the acoustic bass guitar has four strings, which are tuned E-A-D-G, an octave below the lowest four strings of the 6-string guitar.
Like the electric bass guitar, models with five or more strings have been produced, although these are less common. In part, this is because the body of an acoustic bass guitar is too small to produce a resonance of acceptable volume at lower pitches on the low "B" string. One solution uses the five string acoustic bass to add an additional high string instead of adding a low "B". Another solution is to rely on amplification to reproduce the low "B" string's notes. There are semi-acoustic models, fitted with pickups, for use with an amplifier; the soundbox of these instruments is not large enough to amplify the sound. Instead, it produces a distinctive tone when amplified to semi-acoustic electric guitars. Thin-body semi-acoustic basses such as the violin-shaped Höfner made famous by the early Beatles and several Fender models are not regarded as acoustic basses at all, but rather as hollow-bodied bass guitars. There are semi-acoustic basses such as Godin Guitars' "A-Series" that, once amplified, sound much closer between acoustic bass guitars and upright basses, have been used in professional circles to "simulate" one when it would be impractical for transportation and other reasons to use a full-sized upright bass.
As with semi-acoustic electric guitars, the line between acoustic instruments fitted with pickups and electric instruments with tone-enhancing bodies is sometimes hard to draw when some instruments can be equipped with a variety of pickups such as piezo pickups, the "standard" of acoustic-electric instruments as well as synth pickups that can replay "virtual" upright bass sounds and bring a semi-acoustic bass much closer to a double bass sonically. Saga Musical Instruments produces a four-string bass resonator guitar under their Regal brand name.videos National Reso-Phonic Guitars produce three models of resonator bass guitar. Other manufacturers of acoustic bass guitars include Alvarez
Acoustic (Love Amongst Ruin album)
Acoustic is an album by British rock band Love Amongst Ruin and features acoustic versions of eight tracks released on the band's debut album. It was released on 5 December 2011; the band spent two days at Fisher Lane Farm in early August 2011 with producer Paul Corkett to record acoustic versions of nine tracks released on their self-titled debut album. Former member Laurie Ross returned to play cello at the sessions; the album's liner notes state "These versions and the speed with which they were recorded, represent a natural progression that comes from our familiarity with the tracks, having played them throughout the course of our numerous live shows in 2010 and 2011". The album was released on 5 December 2011 via Bandcamp as digital download; the album was preceded by the release of an acoustic version of "Bring Me Down", given away by the band as a free download on SoundCloud on 8 November 2011. Steve Hewitt - vocals Donald Ross Skinner - guitar, backing vocals Steve Hove - guitar, backing vocals Teresa Morini - bass Ramon Sherrington - drums, percussion Laurie Ross - cello, backing vocals
Acoustic (Simple Minds album)
Acoustic is the seventeenth studio album by Scottish rock band Simple Minds, released on 11 November 2016 by Caroline International. The album features acoustic studio recordings of released songs and received mixed reviews; the genesis of Acoustic can be traced back to a rare live session the band recorded for the BBC Radio Two's Chris Evans Breakfast Show on 26 September 2014 promoting their 16th studio album, Big Music. To the band's surprise, the reaction was overwhelmingly favourable; the band performed acoustic sets during some other one-off live appearances including one held on 22 November 2014 in Paris by French radio station RTL notable for a rare outing of "Mandela Day". Besides Kerr and Burchill the band consists of Ged Grimes, Sarah Brown, Gordy Goudie and Cherisse Osei; the acoustic version of "Promised You a Miracle", featuring Scottish singer-songwriter KT Tunstall, was released on 28 September 2016. The album debuted at number 16 on the UK Albums Chart, selling 10,427 units, becoming Simple Minds' 14th top 20 album.
The album received mixed reviews, with Timothy Monger from AllMusic noting that the band "missed out on an opportunity to shake up their repertoire". Andy Gill in The Independent noted the folk influences. David Quantick, writing for Classic Rock, described it as "a strange album, seeking as it does to homogenise the Minds’ ever-changing sound" but concluded that it was "a consistent collection", highlighting the Richard Hawley cover "Long Black Train" as "movingly effective". "The American" "Promised You a Miracle" "Glittering Prize" "See the Lights" "New Gold Dream" "Someone Somewhere in Summertime" "Waterfront" "Sanctify Yourself" "Chelsea Girl" "Alive and Kicking" "Don't You" "Long Black Train" "Stand by Love" "Speed Your Love to Me" "Light Travels"Notes Two different formats are released: a single compact-disc version and a double LP version including 3 exclusive extra tracks, the latter due to be released only on 25 November 2016
Acoustic (Britt Nicole EP)
Acoustic is the second extended play by Christian pop recording artist Britt Nicole. It includes five acoustic versions of previous songs and a brand new song entitled "Found By You", co-written by Brandon Heath, it debuted at No. 22 on Billboard's Hot Christian Albums chart, her second highest entry to date. Album