![]() This article's factual accuracy may be compromised due to out-of-date information. Dolby Digital was the earliest MDCT-based audio compression standard released, and was followed by others for home and portable usage, such as Sony's ATRAC (1992), the MP3 standard (1993) and AAC (1997). The AC-3 format was released as the Dolby Digital standard in February 1991. ĭolby Laboratories adapted the MDCT algorithm along with perceptual coding principles to develop the AC-3 audio format for cinema. Bradley at the University of Surrey in 1987. The DCT was adapted into the MDCT by J.P. It is a modification of the discrete cosine transform (DCT) algorithm, which was proposed by Nasir Ahmed in 1972 for image compression. The basis of the Dolby AC-3 multi-channel audio coding standard is the modified discrete cosine transform (MDCT), a lossy audio compression algorithm. It has since also been used for TV broadcast, radio broadcast via satellite, digital video streaming, DVDs, Blu-ray discs and game consoles. The first use of Dolby Digital was to provide digital sound in cinemas from 35 mm film prints. Called Dolby Stereo Digital until 1995, it is lossy compression (except for Dolby TrueHD). ![]() com /tv /dolby-digital /ĭolby Digital, originally synonymous with Dolby AC-3, is the name for a family of audio compression technologies developed by Dolby Laboratories.
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