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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 BCcite-ref-mpeg-audio-faq-bc-1-0[1]cite-ref-mpeg-bc-2-0[2]cite-ref-iso13818-7-2006-pdf-3-0[3]cite-ref-iso13818-7-2004-pdf-4-0[4]), allowing MPEG-1 audio decoders to decode the two main stereo components of the presentation.cite-ref-mpeg-2-layer-1-2-5-0[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).cite-ref-6[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).cite-ref-mpeg-audio-faq-bc-1-1[1]cite-ref-mpeg-bc-2-1[2]

• Overview

• References

MPEG-2 Part 3 introduced new audio encoding methods compared to MPEG-1 Part 3:cite-ref-mpeg-audio-7-0[7] MPEG-2 BC (backward compatible with MPEG-1 audio formats)cite-ref-mpeg-audio-faq-bc-1-2[1]cite-ref-mpeg-bc-2-2[2]cite-ref-mpeg-2-layer-1-2-5-1[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

cite-note-mpeg-audio-faq-bc-11. ↑ citerefiso1998ISO (October 1998). "MPEG Audio FAQ Version 9 - MPEG-1 and MPEG-2 BC". ISO. Archived from the original on 2010-02-18. Retrieved 2009-10-28.

cite-note-mpeg-bc-22. ↑ citerefmpeg-orgMPEG.ORG. "AAC". Archived from the original on 2007-08-31. Retrieved 2009-10-28.

cite-note-iso13818-7-2006-pdf-33. ↑ citerefiso2006ISO (2006-01-15), ISO/IEC 13818-7, Fourth edition, Part 7 - Advanced Audio Coding (AAC) (PDF), retrieved 2009-10-28

cite-note-iso13818-7-2004-pdf-44. ↑ citerefiso2004ISO (2004-10-15), ISO/IEC 13818-7, Third edition, Part 7 - Advanced Audio Coding (AAC) (PDF), archived from the original (PDF) on 2011-07-13, retrieved 2009-10-19

cite-note-mpeg-2-layer-1-2-55. ↑ citerefwerner-oomenleon-van-de-kerkhofWerner Oomen; Leon van de Kerkhof. "MPEG-2 Audio Layer I/II". chiariglione.org. Archived from the original on 2010-04-30. Retrieved 2009-12-29.

cite-note-66. ↑ Predrag Supurovic, MPEG Audio Frame Header, Retrieved on 2009-07-11

cite-note-mpeg-audio-77. ↑ citerefd-thom-h-purnhagen-and-the-mpeg-audio-subgroup1998D. Thom, H. Purnhagen, and the MPEG Audio Subgroup (October 1998). "MPEG Audio FAQ Version 9 - MPEG Audio". Archived from the original on 2011-08-07. Retrieved 2009-10-31.{{cite web}}: CS1 maint: multiple names: authors list (link)