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</style><div role="note" class="hatnote navigation-not-searchable">Not to be confused with <a href="MPEG-2_Part_7" class="mw-redirect" title="MPEG-2 Part 7">MPEG-2 Part 7</a> (MPEG-2 AAC).</div>

<p>Part 3 of the <a href="MPEG-2" title="MPEG-2">MPEG-2</a> standard (formally known as <b>ISO/IEC 13818-3</b>, also known as <b>MPEG-2 Audio</b> or <b>MPEG-2 BC</b>) defines audio coding:

</p>

<ul><li><a href="MPEG_Multichannel" title="MPEG Multichannel">MPEG Multichannel</a> - It enhances <a href="MPEG-1" title="MPEG-1">MPEG-1</a>'s audio by allowing the coding of audio programs with more than two <a href="Surround_sound" title="Surround sound">channels</a>, up to 5.1 multichannel. This method is backwards-compatible (also known as MPEG-2 BC<sup id="cite_ref-mpeg-audio-faq-bc_1-0" class="reference"><a href="#cite_note-mpeg-audio-faq-bc-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-mpeg-bc_2-0" class="reference"><a href="#cite_note-mpeg-bc-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-iso13818-7-2006-pdf_3-0" class="reference"><a href="#cite_note-iso13818-7-2006-pdf-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-iso13818-7-2004-pdf_4-0" class="reference"><a href="#cite_note-iso13818-7-2004-pdf-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>), allowing MPEG-1 audio decoders to decode the two main stereo components of the presentation.<sup id="cite_ref-mpeg-2-layer-1-2_5-0" class="reference"><a href="#cite_note-mpeg-2-layer-1-2-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></li>

<li>MPEG-2 Part 3 also defined additional bit rates and sample rates for <a href="MPEG-1_Audio_Layer_I" title="MPEG-1 Audio Layer I">MPEG-1 Audio Layer I</a>, <a href="MPEG-1_Audio_Layer_II" title="MPEG-1 Audio Layer II">MPEG-1 Audio Layer II</a> and <a href="MPEG-1_Audio_Layer_III" class="mw-redirect" title="MPEG-1 Audio Layer III">MPEG-1 Audio Layer III</a> (the first version of <a href="MP3" title="MP3">MP3</a>).<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup></li></ul>

<p>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 <a href="Advanced_Audio_Coding" title="Advanced Audio Coding">Advanced Audio Coding</a> with support for multichannel encoding (up to 48 channels).<sup id="cite_ref-mpeg-audio-faq-bc_1-1" class="reference"><a href="#cite_note-mpeg-audio-faq-bc-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-mpeg-bc_2-1" class="reference"><a href="#cite_note-mpeg-bc-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Overview">Overview</h2></div>

<div role="note" class="hatnote navigation-not-searchable">Main articles: <a href="MPEG-1_Audio_Layer_I" title="MPEG-1 Audio Layer I">MPEG-1 Audio Layer I</a>, <a href="MPEG-1_Audio_Layer_II" title="MPEG-1 Audio Layer II">MPEG-1 Audio Layer II</a>, <a href="MP3" title="MP3">MP3</a>, and <a href="MPEG_Multichannel" title="MPEG Multichannel">MPEG Multichannel</a></div>

<p>MPEG-2 Part 3 introduced new audio encoding methods compared to MPEG-1 Part 3:<sup id="cite_ref-mpeg-audio_7-0" class="reference"><a href="#cite_note-mpeg-audio-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> MPEG-2 BC (backward compatible with MPEG-1 audio formats)<sup id="cite_ref-mpeg-audio-faq-bc_1-2" class="reference"><a href="#cite_note-mpeg-audio-faq-bc-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-mpeg-bc_2-2" class="reference"><a href="#cite_note-mpeg-bc-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-mpeg-2-layer-1-2_5-1" class="reference"><a href="#cite_note-mpeg-2-layer-1-2-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>

</p>

<ul><li>low bitrate encoding with halved sampling rate (MPEG-1 Layer <a href="MPEG-1_Audio_Layer_1" class="mw-redirect" title="MPEG-1 Audio Layer 1">1</a>/<a href="MPEG-1_Audio_Layer_2" class="mw-redirect" title="MPEG-1 Audio Layer 2">2</a>/<a href="MPEG-1_Audio_Layer_3" class="mw-redirect" title="MPEG-1 Audio Layer 3">3</a> LSF - "Low Sampling Frequencies")</li>

<li>multichannel encoding with up to 5.1 channels</li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite id="CITEREFISO1998" class="citation web cs1">ISO (October 1998). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100218081343/http://mpeg.chiariglione.org/faq/mp1-aud/mp1-aud.htm">"MPEG Audio FAQ Version 9 - MPEG-1 and MPEG-2 BC"</a>. ISO. Archived from <a rel="nofollow" class="external text" href="http://mpeg.chiariglione.org/faq/mp1-aud/mp1-aud.htm">the original</a> on 2010-02-18<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-10-28</span></span>.</cite></span>

</li>

<li id="cite_note-mpeg-bc-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-mpeg-bc_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-mpeg-bc_2-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-mpeg-bc_2-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><cite id="CITEREFMPEG.ORG" class="citation web cs1">MPEG.ORG. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20070831110756/http://www.mpeg.org/MPEG/audio/aac.html">"AAC"</a>. Archived from <a rel="nofollow" class="external text" href="http://www.mpeg.org/MPEG/audio/aac.html">the original</a> on 2007-08-31<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-10-28</span></span>.</cite></span>

</li>

<li id="cite_note-iso13818-7-2006-pdf-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-iso13818-7-2006-pdf_3-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFISO2006" class="citation cs2">ISO (2006-01-15), <a rel="nofollow" class="external text" href="http://webstore.iec.ch/preview/info_isoiec13818-7%7Bed4.0%7Den.pdf"><i>ISO/IEC 13818-7, Fourth edition, Part 7 - Advanced Audio Coding (AAC)</i></a> <span class="cs1-format">(PDF)</span><span class="reference-accessdate">, retrieved <span class="nowrap">2009-10-28</span></span></cite></span>

</li>

<li id="cite_note-iso13818-7-2004-pdf-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-iso13818-7-2004-pdf_4-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFISO2004" class="citation cs2">ISO (2004-10-15), <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110713115817/http://jongyeob.com/moniwiki/pds/upload/13818-7.pdf"><i>ISO/IEC 13818-7, Third edition, Part 7 - Advanced Audio Coding (AAC)</i></a> <span class="cs1-format">(PDF)</span>, archived from <a rel="nofollow" class="external text" href="http://jongyeob.com/moniwiki/pds/upload/13818-7.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2011-07-13<span class="reference-accessdate">, retrieved <span class="nowrap">2009-10-19</span></span></cite></span>

</li>

<li id="cite_note-mpeg-2-layer-1-2-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-mpeg-2-layer-1-2_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-mpeg-2-layer-1-2_5-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite id="CITEREFWerner_OomenLeon_van_de_Kerkhof" class="citation web cs1">Werner Oomen; Leon van de Kerkhof. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100430183150/http://mpeg.chiariglione.org/technologies/mpeg-2/mp02-aud/index.htm">"MPEG-2 Audio Layer I/II"</a>. chiariglione.org. Archived from <a rel="nofollow" class="external text" href="http://mpeg.chiariglione.org/technologies/mpeg-2/mp02-aud/index.htm">the original</a> on 2010-04-30<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-12-29</span></span>.</cite></span>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text">Predrag Supurovic, <a rel="nofollow" class="external text" href="http://www.datavoyage.com/mpgscript/mpeghdr.htm">MPEG Audio Frame Header</a>, Retrieved on 2009-07-11</span>

</li>

<li id="cite_note-mpeg-audio-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-mpeg-audio_7-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFD._Thom,_H._Purnhagen,_and_the_MPEG_Audio_Subgroup1998" class="citation web cs1">D. Thom, H. Purnhagen, and the MPEG Audio Subgroup (October 1998). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110807233226/http://mpeg.chiariglione.org/faq/audio.htm">"MPEG Audio FAQ Version 9 - MPEG Audio"</a>. Archived from <a rel="nofollow" class="external text" href="http://mpeg.chiariglione.org/faq/audio.htm">the original</a> on 2011-08-07<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-10-31</span></span>.</cite><span class="cs1-maint citation-comment"><code class="cs1-code">{{cite web}}</code>: CS1 maint: multiple names: authors list (link)</span></span>

</li>

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</style><div id="MPEG_(Moving_Picture_Experts_Group)397" style="font-size:114%;margin:0 4em"><a href="Moving_Picture_Experts_Group" title="Moving Picture Experts Group">MPEG (Moving Picture Experts Group)</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2" style="font-size:115%;"><div>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MPEG-1 Parts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li>Part 1: Systems

<ul><li><a href="MPEG_program_stream" title="MPEG program stream">Program stream</a></li></ul></li>

<li>Part 2: Video

<ul><li>based on <a href="H.261" title="H.261">H.261</a></li></ul></li>

<li>Part 3: Audio

<ul><li><a href="MPEG-1_Audio_Layer_I" title="MPEG-1 Audio Layer I">Layer I</a></li>

<li><a href="MPEG-1_Audio_Layer_II" title="MPEG-1 Audio Layer II">Layer II</a></li>

<li><a href="MP3" title="MP3">Layer III</a></li></ul></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MPEG-2 Parts</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li>Part 1: Systems (H.222.0)

<ul><li><a href="MPEG_transport_stream" title="MPEG transport stream">Transport stream</a></li>

<li><a href="MPEG_program_stream" title="MPEG program stream">Program stream</a></li></ul></li>

<li><a href="H.262/MPEG-2_Part_2" title="H.262/MPEG-2 Part 2">Part 2: Video (H.262)</a></li>

<li>

<ul><li><a href="MPEG-1_Audio_Layer_I" title="MPEG-1 Audio Layer I">Layer I</a></li>

<li><a href="MPEG-2_Audio_Layer_II" class="mw-redirect" title="MPEG-2 Audio Layer II">Layer II</a></li>

<li><a href="MP3" title="MP3">Layer III</a></li>

<li><a href="MPEG_Multichannel" title="MPEG Multichannel">MPEG Multichannel</a></li></ul></li>

<li><a href="Advanced_Audio_Coding" title="Advanced Audio Coding">Part 7: Advanced Audio Coding</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MPEG-4 Parts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="MPEG-4_Part_2" title="MPEG-4 Part 2">Part 2: Video</a>

<ul><li>based on <a href="H.263" title="H.263">H.263</a></li></ul></li>

<li><a href="MPEG-4_Part_3" title="MPEG-4 Part 3">Part 3: Audio</a></li>

<li><a href="Advanced_Video_Coding" title="Advanced Video Coding">Part 10: Advanced Video Coding (H.264)</a></li>

<li><a href="MPEG-4_Part_11" title="MPEG-4 Part 11">Part 11: Scene description</a></li>

<li><a href="ISO_base_media_file_format" title="ISO base media file format">Part 12: ISO base media file format</a></li>

<li><a href="MPEG-4_Part_14" class="mw-redirect" title="MPEG-4 Part 14">Part 14: MP4 file format</a></li>

<li><a href="MPEG-4_Part_17" title="MPEG-4 Part 17">Part 17: Streaming text format</a></li>

<li><a href="MPEG-4_Part_20" title="MPEG-4 Part 20">Part 20: LASeR</a></li>

<li><a href="Open_Font_Format" class="mw-redirect" title="Open Font Format">Part 22: Open Font Format</a></li>

<li><a href="Internet_Video_Coding" title="Internet Video Coding">Part 33: Internet Video Coding</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MPEG-7 Parts</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Description_Definition_Language" title="Description Definition Language">Part 2: Description definition language</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MPEG-21 Parts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Digital_Item" title="Digital Item">Parts 2, 3 and 9: Digital Item</a></li>

<li><a href="Rights_Expression_Language" title="Rights Expression Language">Part 5: Rights Expression Language</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MPEG-D Parts</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="MPEG_Surround" title="MPEG Surround">Part 1: MPEG Surround</a></li>

<li><a href="Unified_Speech_and_Audio_Coding" title="Unified Speech and Audio Coding">Part 3: Unified Speech and Audio Coding</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MPEG-G Parts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="MPEG-G" title="MPEG-G">Part 1: Transport and Storage of Genomic Information</a></li>

<li><a href="MPEG-G" title="MPEG-G">Part 2: Coding of Genomic Information</a></li>

<li><a href="MPEG-G" title="MPEG-G">Part 4: Reference Software</a></li>

<li><a href="MPEG-G" title="MPEG-G">Part 5: Conformance</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MPEG-H Parts</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="MPEG_media_transport" title="MPEG media transport">Part 1: MPEG media transport</a></li>

<li><a href="High_Efficiency_Video_Coding" title="High Efficiency Video Coding">Part 2: High Efficiency Video Coding (H.265)</a></li>

<li><a href="MPEG-H_3D_Audio" title="MPEG-H 3D Audio">Part 3: MPEG-H 3D Audio</a></li>

<li><a href="High_Efficiency_Image_File_Format" title="High Efficiency Image File Format">Part 12: High Efficiency Image File Format</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MPEG-I Parts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Versatile_Video_Coding" title="Versatile Video Coding">Part 3: Versatile Video Coding (H.266)</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">MPEG-5 Parts</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Essential_Video_Coding" title="Essential Video Coding">Part 1: Essential Video Coding</a></li>

<li><a href="LCEVC" title="LCEVC">Part 2: Low Complexity Enhancement Video Coding</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><a href="Dynamic_Adaptive_Streaming_over_HTTP" title="Dynamic Adaptive Streaming over HTTP">MPEG-DASH</a></div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-07-19" href="https://en.wikipedia.org/wiki/?title=MPEG-2_Part_3&oldid=1301407093">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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