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词条 MPEG-2 Part 3
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  1. Overview

  2. References

{{Hatnote|Not to be confused with MPEG-2 Part 7 (MPEG-2 AAC).}}{{Expert needed|date=January 2011}}

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|MPEG-1 Audio Layer I|MPEG-1 Audio Layer II|MP3|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 2 {{Cite web| url=http://mpeg.chiariglione.org/faq/mp1-aud/mp1-aud.htm | title=MPEG Audio FAQ Version 9 - MPEG-1 and MPEG-2 BC | author=ISO | date=October 1998 | publisher=ISO | accessdate=2009-10-28}}
2. ^1 2 {{Cite web| url=http://www.mpeg.org/MPEG/audio/aac.html | title=AAC | author=MPEG.ORG | accessdate=2009-10-28}}
3. ^{{citation | url=http://webstore.iec.ch/preview/info_isoiec13818-7%7Bed4.0%7Den.pdf | title=ISO/IEC 13818-7, Fourth edition, Part 7 - Advanced Audio Coding (AAC) | author=ISO | format=PDF | page= | date=2006-01-15 | accessdate=2009-10-28 }}
4. ^{{citation|url=http://jongyeob.com/moniwiki/pds/upload/13818-7.pdf |archive-url=https://web.archive.org/web/20110713115817/http://jongyeob.com/moniwiki/pds/upload/13818-7.pdf |dead-url=yes |archive-date=2011-07-13 |title=ISO/IEC 13818-7, Third edition, Part 7 - Advanced Audio Coding (AAC) |author=ISO |format=PDF |page= |date=2004-10-15 |accessdate=2009-10-19 }}
5. ^1 {{Cite web| url=http://mpeg.chiariglione.org/technologies/mpeg-2/mp02-aud/index.htm | title=MPEG-2 Audio Layer I/II |author1=Werner Oomen |author2=Leon van de Kerkhof | publisher=chiariglione.org | accessdate=2009-12-29}}
6. ^Predrag Supurovic, MPEG Audio Frame Header, Retrieved on 2009-07-11
7. ^{{Cite web| url=http://mpeg.chiariglione.org/faq/audio.htm | title=MPEG Audio FAQ Version 9 - MPEG Audio | author=D. Thom, H. Purnhagen, and the MPEG Audio Subgroup | date=October 1998 | accessdate=2009-10-31}}
{{MPEG}}

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