MPEG-2 Part 3
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Not to be confused with MPEG-2 Part 7 (MPEG-2 AAC).
Part 3 of the MPEG-2 standard (formally known as ISO/IEC 13818-3, also known as MPEG-2 Audio or MPEG-2 BC) defines audio coding:
- MPEG Multichannel - It enhances MPEG-1's audio by allowing the coding of audio programs with more than two channels, up to 5.1 multichannel. This method is backwards-compatible (also known as MPEG-2 BC[1] [2] [3] [4] ), allowing MPEG-1 audio decoders to decode the two main stereo components of the presentation.[5]
- MPEG-2 Part 3 also defined additional bit rates and sample rates for MPEG-1 Audio Layer I, MPEG-1 Audio Layer II and MPEG-1 Audio Layer III (the first version of MP3).[6]
The MPEG-2 Part 3 should not be confused with MPEG-2 Part 7: AAC a.k.a. MPEG-2 NBC (Non-Backward Compatible) - the MPEG-2 Advanced Audio Coding with support for multichannel encoding (up to 48 channels).[1] [2]
Overview
[edit ]MPEG-2 Part 3 introduced new audio encoding methods compared to MPEG-1 Part 3:[7] MPEG-2 BC (backward compatible with MPEG-1 audio formats)[1] [2] [5]
- low bitrate encoding with halved sampling rate (MPEG-1 Layer 1/2/3 LSF - "Low Sampling Frequencies")
- multichannel encoding with up to 5.1 channels
References
[edit ]- ^ a b c ISO (October 1998). "MPEG Audio FAQ Version 9 - MPEG-1 and MPEG-2 BC". ISO. Retrieved 2009年10月28日.
- ^ a b c MPEG.ORG. "AAC". Archived from the original on 2007年08月31日. Retrieved 2009年10月28日.
- ^ ISO (2006年01月15日), ISO/IEC 13818-7, Fourth edition, Part 7 - Advanced Audio Coding (AAC) (PDF), retrieved 2009年10月28日
- ^ ISO (2004年10月15日), ISO/IEC 13818-7, Third edition, Part 7 - Advanced Audio Coding (AAC) (PDF), archived from the original (PDF) on 2011年07月13日, retrieved 2009年10月19日
- ^ a b Werner Oomen; Leon van de Kerkhof. "MPEG-2 Audio Layer I/II". chiariglione.org. Retrieved 2009年12月29日.
- ^ Predrag Supurovic, MPEG Audio Frame Header, Retrieved on 2009年07月11日
- ^ D. Thom, H. Purnhagen, and the MPEG Audio Subgroup (October 1998). "MPEG Audio FAQ Version 9 - MPEG Audio" . Retrieved 2009年10月31日.
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