Dolby Digital
Videos
Dolby Digital, originally synonymous with Dolby AC-3, is the name for a family of audio compression technologies developed by Dolby Laboratories. Called Dolby Stereo Digital until 1995, it uses lossy
A Dolby Digital Penthouse Soundhead mounted on a mid-1950s vintage Kalee model 20 projector
A photo of a 35 mm film print featuring all four audio formats (or quad track) - from left to right: Sony Dynamic Digital Sound (SDDS) (blue area to the left of the sprocket holes), Dolby Digital (grey area between the sprocket holes labelled with the Dolby Double-D logo in the middle), analog optical sound (the two white lines to the right of the sprocket holes), and the DTS time code (the dashed line to the far right)
A Dolby home theater badge on a laptop computer
S/PDIF
Videos
S/PDIF is a type of digital audio interface used in consumer audio equipment to output audio over relatively short distances. The signal is transmitted over either a coaxial cable using RCA or BNC con
S/PDIF and TOSLINK connectors on a piece of audio equipment
Digital audio coaxial RCA connector (orange)