MPEG-2 Part 3

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

MPEG (Moving Picture Experts Group)

MPEG-1 2 3 4 7 21 A B C D E V M U H

MPEG-1 Parts	Part 1: Systems Program stream Part 2: Video based on H.261 Part 3: Audio Layer I Layer II Layer III

MPEG-2 Parts	Part 1: Systems (H.222.0) Transport stream Program stream Part 2: Video (H.262) Part 3: Audio Layer I Layer II Layer III MPEG Multichannel Part 6: DSM CC Part 7: Advanced Audio Coding

MPEG-4 Parts	Part 2: Video based on H.263 Part 3: Audio Part 6: DMIF Part 10: Advanced Video Coding (H.264) Part 11: Scene description Part 12: ISO base media file format Part 14: MP4 file format Part 17: Streaming text format Part 20: LASeR Part 22: Open Font Format

MPEG-7 Parts	Part 2: Description definition language

MPEG-21 Parts	Parts 2, 3 and 9: Digital Item Part 5: Rights Expression Language

MPEG-D Parts	Part 1: MPEG Surround Part 3: Unified Speech and Audio Coding

MPEG-H Parts	Part 1: MPEG media transport Part 2: High Efficiency Video Coding Part 3: MPEG-H 3D Audio

Other	MPEG-DASH

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