Audio Coding Format Part 2
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).
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.
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).
list of lossy formats
general
Audio Coding Standard Basic Compression Algorithm abbreviation introduce Market Share (2019) Refer To
Modified Discrete Cosine Transform (MDCT) Dolby Digital (AC-3) AC3 1991 58%
ATRAC 1992 Unknown Adaptive Transformation Vocoding
MPEG layer 3 MP3 1993 49%
Advanced Audio Coding (MPEG-2/MPEG-4) CAA 1997 88%
Windows Media Audio WMA 1999 unknown
Ogg Vorbis Auger 2000 7%
Celtic Restricted Power Overlay Transformation 2011 does not apply
work work 2012 8%
digital to analog converter digital to analog converter 2015 unknown
Adaptive Differential Pulse Code Modulation (ADPCM) aptX / aptX-HD aptX 1989 unknown
DTS digital cinema system 1990 14%
Master of Quality Certification Quality Management Association 2014 unknown
Subband Coding (SBC) Audio Layer MPEG-1 II MP2 1993 unknown
musepack MPC 1997
talks
Further information: Speech coding
Linear Predictive Coding (LPC)
Adaptive Predictive Coding (APC)
Code Excited Linear Prediction (CELP)
Algebraic Code Excited Linear Prediction (ACELP)
Relaxation Code Excited Linear Prediction (RCELP)
Low latency CELP (LD-CELP)
Adaptive Multitariff (for GSM and 3GPP)
Codec2 (famous for lack of patent restrictions)
Speex (famous for lack of patent restrictions)
Modified Discrete Cosine Transform (MDCT)
AAC-LD
Constrained Energy Superposition Transformation (CELT)
Opus (mainly for real-time applications)
