Dolby Analog SR or Dolby SR format (Spectral Recording), was developed by Dolby Laboratories and has been in common use in professional audio since 1986. It is a revised version of Dolby's earlier models, combining aspects of Dolby A, B and C (e.g. sliding band and fixed band companders) to improve the dynamic range (i.e. the range in deciBels between peak level and noise floor) of analogue recordings and transmissions by as much as 25 dB. Dolby Laboratories, Incorporated (Dolby Labs) is a company specializing in audio compression and reproduction. ... 1986 (MCMLXXXVI) was a common year starting on Wednesday of the Gregorian calendar. ...
Dolby SR is used in almost all modern professional audio analog (i.e. tape) recording by recording and postproduction engineers, broadcasters, and other audio professionals. Dolby analog soundtracks also incorporate Dolby SR technology.
Dolby Digital EX is very similar in practice to Dolby's earlier Pro-Logic format, which utilized Matrix technology to add a center and single rear surround channel to stereo soundtracks.
Dolby Digital SR-D cinema soundtracks are optically recorded on a 35mm release print using sequential data blocks placed between every perforation hole on the sound track side of the film.
Dolby is part of a group of organizations involved in the development of AAC (Advanced Audio Coding), part of MPEG specifications, and also considered the successor to MP3.
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