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 (the first version of 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

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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

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1. ^ a b c ISO (October 1998). "MPEG Audio FAQ Version 9 - MPEG-1 and MPEG-2 BC". ISO. Retrieved 2009-10-28.
2. ^ a b c 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. ^ a b 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)

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MPEG (Moving Picture Experts Group)

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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
* Part 33: Internet Video Coding

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-G Parts|

* Part 1: Transport and Storage of Genomic Information
* Part 2: Coding of Genomic Information
* Part 3: APIs
* Part 4: Reference Software
* Part 5: Conformance

MPEG-H Parts|

* Part 1: MPEG media transport
* Part 2: High Efficiency Video Coding (H.265)
* Part 3: MPEG-H 3D Audio
* Part 12: High Efficiency Image File Format

MPEG-I Parts|

* Part 3: Versatile Video Coding (H.266)

MPEG-5 Parts|

* Part 1: Essential Video Coding
* Part 2: Low Complexity Enhancement Video Coding

Other|

MPEG-DASH
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