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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), allowing MPEG-1 audio decoders to decode the two main stereo components of the presentation.
• 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).

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).

Overview

MPEG-2 Part 3 introduced new audio encoding methods compared to MPEG-1 Part 3: MPEG-2 BC (backward compatible with MPEG-1 audio formats)

• 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. ^ ISO (October 1998). "MPEG Audio FAQ Version 9 - MPEG-1 and MPEG-2 BC". ISO. Retrieved 2009-10-28.
2. ^ MPEG.ORG. "AAC". Archived from the original on 2007-08-31. 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), archived from the original (PDF) on 2011-07-13, retrieved 2009-10-19
5. ^ 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.{{cite web}}: CS1 maint: multiple names: authors list (link)

• MPEG-2