Editing MPEG-4 Part 3 (section)

{{Short description|Third part of the ISO/IEC MPEG-4 standard}}
'''MPEG-4 Part 3''' or '''MPEG-4 Audio''' (formally [[International Organization for Standardization|ISO]]/[[International Electrotechnical Commission|IEC]] 14496-3) is the third part of the [[International Organization for Standardization|ISO]]/[[International Electrotechnical Commission|IEC]] [[MPEG-4]] international standard developed by [[Moving Picture Experts Group]].<ref name="mpeg4audio-iso">{{cite web|url=https://www.iso.org/standard/53943.html|title=ISO/IEC 14496-3:2009 - Information technology -- Coding of audio-visual objects -- Part 3: Audio|author=ISO|year=2009|publisher=ISO|access-date=2009-10-06|author-link=International Organization for Standardization}}</ref> It specifies [[audio coding]] methods. The first version of ISO/IEC 14496-3 was published in 1999.<ref name="mpeg4audio-iso-1999">{{cite web|url=https://www.iso.org/standard/25035.html|title=ISO/IEC 14496-3:1999 - Information technology -- Coding of audio-visual objects -- Part 3: Audio|author=ISO|year=1999|publisher=ISO|access-date=2009-10-06|author-link=International Organization for Standardization}}</ref>

The MPEG-4 Part 3 consists of a variety of audio coding technologies – from [[lossy compression|lossy]] [[speech coding]] ([[Harmonic Vector Excitation Coding|HVXC]], [[CELP]]), general audio coding ([[Advanced Audio Coding|AAC]], [[TwinVQ]], BSAC), [[lossless compression|lossless]] audio compression ([[MPEG-4 SLS]], [[Audio Lossless Coding]], [[Direct Stream Transfer#DST|MPEG-4 DST]]), a [[Text to speech|Text-To-Speech]] Interface (TTSI), [[MPEG-4 Structured Audio|Structured Audio]] (using [[Structured Audio Orchestra Language|SAOL]], SASL, [[MIDI]]) and many additional audio synthesis and coding techniques.<ref name="mpeg4audio-licensing">{{cite web | url=http://www.thefreelibrary.com/MPEG-4+Audio+Licensing+Committee+Selects+Via+Licensing+Corporation+as+...-a094779778 | title=MPEG-4 Audio Licensing Committee Selects Via Licensing Corporation as Administrator; MPEG-4 Audio Licensing Committee Finalizing Terms for Audio Profile Licensing. | author=Business Wire | publisher=The Free Library | date=2002-12-02 | access-date=2009-10-06}}</ref><ref name="mpeg4audio-profiles">{{cite web|url=http://mpeg.chiariglione.org/tutorials/papers/icj-mpeg4-si/09-natural_audio_paper/profiles.html |title=MPEG-4 Natural Audio Coding – Audio profiles and levels |author1=Karlheinz Brandenburg |author2=Oliver Kunz |author3=Akihiko Sugiyama |publisher=chiariglione.org |year=1999 |access-date=2009-10-06 |url-status=dead |archive-url=https://web.archive.org/web/20100717130019/http://mpeg.chiariglione.org/tutorials/papers/icj-mpeg4-si/09-natural_audio_paper/profiles.html |archive-date=2010-07-17 }}</ref><ref name="mpeg4audio-scalability">{{cite web|url=http://mpeg.chiariglione.org/tutorials/papers/icj-mpeg4-si/09-natural_audio_paper/scalability.html |title=MPEG-4 Natural Audio Coding – scalability in MPEG-4 natural audio |author1=Karlheinz Brandenburg |author2=Oliver Kunz |author3=Akihiko Sugiyama |publisher=chiariglione.org |access-date=2009-10-06 |url-status=dead |archive-url=https://web.archive.org/web/20100228165503/http://mpeg.chiariglione.org/tutorials/papers/icj-mpeg4-si/09-natural_audio_paper/scalability.html |archive-date=2010-02-28 }}</ref><ref name="mpeg-audio-faq">{{cite web|url=https://mpeg.chiariglione.org/faq/mp4-aud/mp4-aud.htm|title=MPEG Audio FAQ – MPEG-4|author=D. Thom, H. Purnhagen, and the MPEG Audio Subgroup|date=October 1998|publisher=chiariglione.org|access-date=2009-10-06}}</ref><ref name="mpeg4audio-version2">{{Cite FTP | url=ftp://ftp.tnt.uni-hannover.de/pub/MPEG/audio/mpeg4/documents/w2803/w2803_n.pdf | title=ISO/IEC 14496-3:/Amd.1 – Final Committee Draft – MPEG-4 Audio Version 2 | author=[[International Organization for Standardization|ISO]]/[[International Electrotechnical Commission|IEC]] JTC 1/SC 29/WG 11 | date=July 1999 | access-date=2009-10-07 | url-status=dead | server=FTP server }}</ref><ref name="mpeg4audio-version2-overview">{{citation | url=ftp://ftp.tnt.uni-hannover.de/pub/papers/1999/AES17-HP.pdf | title=An Overview of MPEG-4 Audio Version 2 | author=Heiko Purnhagen | publisher=Heiko Purnhagen | date=1999-06-07 | archive-url=https://web.archive.org/web/20170706032218/ftp://ftp.tnt.uni-hannover.de/pub/papers/1999/AES17-HP.pdf | archive-date=2017-07-06 | url-status=dead | access-date=2009-10-07 }}</ref><ref name="mpeg4audio1">{{cite web | url=http://140.130.175.70/html/mpeg4/sound.media.mit.edu/mpeg4/audio/general/index.html#aes106 | title=The MPEG-4 Audio Standard: Overview and Applications | author=Heiko Purnhagen | publisher=Heiko Purnhagen | date=2001-06-01 | access-date=2009-10-07}} {{Dead link|date=September 2010|bot=H3llBot}}</ref><ref name="mpeg4audio-purnhagen">{{cite web | url=http://140.130.175.70/html/mpeg4/sound.media.mit.edu/mpeg4/audio/index.html#mpeg4 | title=The MPEG Audio Web Page – MPEG-4 Audio (ISO/IEC 14496-3) | author=Heiko Purnhagen | date=2001-11-07 | access-date=2009-10-07}} {{Dead link|date=September 2010|bot=H3llBot}}</ref><ref name="mpeg4overview">{{cite web|url=https://mpeg.chiariglione.org/standards/mpeg-4/mpeg-4.htm|title=Overview of the MPEG-4 Standard|author=Rob Koenen, ISO/IEC JTC1/SC29/WG11|date=March 2002|publisher=chiariglione.org|access-date=2009-10-06}}</ref>

MPEG-4 Audio does not target a single application such as real-time telephony or high-quality audio compression. It applies to every application which requires the use of advanced sound compression, synthesis, manipulation, or playback.
MPEG-4 Audio is a new type of audio standard that integrates numerous different types of audio coding: natural sound and synthetic sound, low bitrate delivery and high-quality delivery, speech and music, complex soundtracks and simple ones, traditional content and interactive content.<ref name="mpeg4audio-version2" />