MPEG-2 Part 3

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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 (a.k.a. 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

Main articles: MPEG-1 Audio Layer I, MPEG-1 Audio Layer II, MP3, and MPEG Multichannel

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

  1. ↑ 1.0 1.1 1.2 ISO (October 1998). "MPEG Audio FAQ Version 9 - MPEG-1 and MPEG-2 BC". ISO. Retrieved 2009-10-28. 
  2. ↑ 2.0 2.1 2.2 MPEG.ORG. "AAC". Retrieved 2009-10-28. 
  3. ↑ ISO (2006-01-15), ISO/IEC 13818-7, Fourth edition, Part 7 - Advanced Audio Coding (AAC) (PDF), retrieved 2009-10-28 
  4. ↑ ISO (2004-10-15), ISO/IEC 13818-7, Third edition, Part 7 - Advanced Audio Coding (AAC) (PDF), retrieved 2009-10-19 
  5. ↑ 5.0 5.1 Werner Oomen, Leon van de Kerkhof. "MPEG-2 Audio Layer I/II". chiariglione.org. Retrieved 2009-12-29. 
  6. ↑ Predrag Supurovic, MPEG Audio Frame Header, Retrieved on 2009-07-11
  7. ↑ D. Thom, H. Purnhagen, and the MPEG Audio Subgroup (October 1998). "MPEG Audio FAQ Version 9 - MPEG Audio". Retrieved 2009-10-31. 
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