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In 1950, Bell Labs applied for a patent on Differential Pulse Code Modulation (DPCM). In 1973, P. Cummiskey, Nikil S. Jayant, and James L. Flanagan of Bell Labs introduced Adaptive DPCM (ADPCM).<\/p>\n
![\"AUDIO](\"https:\/\/3.bp.blogspot.com\/-cFyKrU7cDI4\/XFDI51jQ6hI\/AAAAAAAAEsI\/gTGAyz-fln0iM7Qs2RIVMab-IC7s4Aq4ACLcBGAs\/s1600\/audio%2Bformats.png\")
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Perceptual coding was first used for linear predictive coding (LPC) speech coding compression. The original concept of LPC dates back to the work of Fumitada Itakura (Nagoya University) and Saito Saito (Telegraph and Telephone in Japan) in 1966. In the 1970s, Bishnu S. Atal and Manfred R. Schroeder of Bell Labs developed a form of adaptive predictive coding (APC) called LPC, a perceptual coding algorithm that exploited the masking properties of the human ear, and later in 1980 The Code Excited Linear Prediction (CELP) algorithm appeared in the early 1990s , which achieved remarkable compression rates at the time. Perceptual coding is used by modern audio compression formats like MP3 and AAC.<\/p>\n
Discrete Cosine Transform (DCT) by Nasir Ahmed, T. Developed by Natarajan and KR Rao in 1974, provides the basis for the Modified Discrete Cosine Transform (MDCT) used by modern audio compression formats such as MP3 and AAC. TCMD by JP Princen, A. W. Johnson, and AB Bradley in 1987, following earlier work by Princen and Bradley in 1986. MDCT is used by modern audio compression formats such as Dolby Digital, MP3, and Advanced Audio Coding (AAC).<\/p>\n
list of lossy formats
\ngeneral
\nAudio Coding Standard Basic Compression Algorithm abbreviation introduce Market Share (2019) Refer To
\nModified Discrete Cosine Transform (MDCT) Dolby Digital (AC-3) AC3 1991 58%
\nATRAC 1992 Unknown Adaptive Transformation Vocoding
\nMPEG layer 3 MP3 1993 49%
\nAdvanced Audio Coding (MPEG-2\/MPEG-4) CAA 1997 88%
\nWindows Media Audio WMA 1999 unknown
\nOgg Vorbis Auger 2000 7%
\nCeltic Restricted Power Overlay Transformation 2011 does not apply
\nwork work 2012 8%
\ndigital to analog converter digital to analog converter 2015 unknown
\nAdaptive Differential Pulse Code Modulation (ADPCM) aptX \/ aptX-HD aptX 1989 unknown
\nDTS digital cinema system 1990 14%
\nMaster of Quality Certification Quality Management Association 2014 unknown
\nSubband Coding (SBC) Audio Layer MPEG-1 II MP2 1993 unknown
\nmusepack MPC 1997
\ntalks
\nFurther information: Speech coding
\nLinear Predictive Coding (LPC)
\nAdaptive Predictive Coding (APC)
\nCode Excited Linear Prediction (CELP)
\nAlgebraic Code Excited Linear Prediction (ACELP)
\nRelaxation Code Excited Linear Prediction (RCELP)
\nLow latency CELP (LD-CELP)
\nAdaptive Multitariff (for GSM and 3GPP)
\nCodec2 (famous for lack of patent restrictions)
\nSpeex (famous for lack of patent restrictions)
\nModified Discrete Cosine Transform (MDCT)
\nAAC-LD
\nConstrained Energy Superposition Transformation (CELT)
\nOpus (mainly for real-time applications)<\/p>\n","protected":false},"excerpt":{"rendered":"