Audio Coding Standards

Audio Coding Standards - Audio Coding Standards: Overview...

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1/20/2010 Audio Coding Standards: Overview and Basic Principles Jerry D. Gibson ECE 241 Winter Quarter 2010 1
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1/20/2010 History of MPEG Standards [1] • MPEG-1 coding of synchronized video and audio at a total rate of 1.5 MBPS finalized in 1992 • MPEG-2 coding of s synchronized video and audio at a total rate of 10 MBPS finalized in 1994 • MPEG-4 finalized in 1998 2
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1/20/2010 MPEG-1 Audio [1] • Originally intended for the coded representation of high quality audio for storage media and decoding high quality audio • Later tested under ITU-R and recommended for some broadcasting applications • Standardization of the bitstream and decoder only, but not the encoder 3
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1/20/2010 MPEG-2 Audio [1] • Initial goal was to define the multichannel extension to MPEG-1, designated MPEG-2 BC (backwards compatible), and to • Define lower sampling rates than MPEG-1, 16 kHz, 22.5 kHz, and 24 kHz • Later MPEG-2 NBC or MPEG-2 AAC • Also, MPEG-2 LSF and MPEG-2.5 4
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1/20/2010 Other Audio Coding Standards • Dolby AC-3 • DVD-Audio 5
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1/20/2010 Audio Coding Standards and Applications [2] 6
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1/20/2010 Generic Audio Coding Method [2] 7
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1/20/2010 Absolute Threshold of Hearing in Quiet [2] 8
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1/20/2010 MPEG-1 Layer I/II Encoder [2] 9
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1/20/2010 MPEG-1 Layer III Encoder [2] 10
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1/20/2010 Magnitude Response—Uniform Filter Bank [2] 11
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1/20/2010 Uniform M-Band Maximally Decimated Analysis Synthesis Filter Bank [2] 12
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Audio Coding Standards - Audio Coding Standards: Overview...

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