Editing High-Efficiency Advanced Audio Coding (section)

==History==
The progenitor of HE-AAC was developed by [[Coding Technologies]] by combining MPEG-2 AAC-LC with a proprietary mechanism for [[spectral band replication]] (SBR), to be used by [[XM Radio]] for their satellite radio service. Subsequently, Coding Technologies submitted their SBR mechanism to MPEG as a basis of what ultimately became HE-AAC.

HE-AAC v1 was standardized as a profile of MPEG-4 Audio in 2003 by [[Moving Picture Experts Group|MPEG]] and published as part of the ISO/IEC 14496-3:2001/Amd 1:2003<ref name="ISO 2003">{{cite web | title=Bandwidth extension, ISO/IEC 14496-3:2001/Amd 1:2003 | url=http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=38148 | author=ISO | publisher=ISO | year=2003 | access-date=2009-10-13 | url-status=live | archive-url=https://web.archive.org/web/20120104074607/http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=38148 | archive-date=2012-01-04 }}</ref> specification.

The HE-AAC v2 profile was standardized in 2006 as per ISO/IEC 14496-3:2005/Amd 2:2006.<ref name="mpeg4audio-n7016" /><ref name="ISO 14496-3:2005/Amd.2">{{cite web | title=Audio Lossless Coding (ALS), new audio profiles and BSAC extensions, ISO/IEC 14496-3:2005/Amd 2:2006 | url=http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=43026 | author=ISO | publisher=ISO | year=2006 | access-date=2009-10-13 | url-status=live | archive-url=https://web.archive.org/web/20120104072435/http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=43026 | archive-date=2012-01-04 }}</ref>

Parts of the HE-AAC specification had previously been standardized and published by various bodies in
'''3GPP TS 26.401'''
,<ref name="3gpp26401">{{cite web | title=3GPP TS 26.401 V6.0.0 (2004-09), General Audio Codec audio processing functions; Enhanced aacPlus General Audio Codec; General Description (Release 6) | url=http://www.3gpp.org/ftp/Specs/archive/26_series/26.401/26401-600.zip | format=DOC | author=3GPP | publisher=3GPP | date=2004-09-30 | access-date=2009-10-13 | url-status=live | archive-url=https://web.archive.org/web/20060819083421/http://www.3gpp.org/ftp/Specs/archive/26_series/26.401/26401-600.zip | archive-date=2006-08-19 }}</ref>
'''ETSI TS 126 401 V6.1.0'''
,<ref name="3gpp126401">{{cite web | title=ETSI TS 126 401 V6.1.0 (2004-12) - Universal Mobile Telecommunications System (UMTS); General audio codec audio processing functions; Enhanced aacPlus general audio codec; General description (3GPP TS 26.401 version 6.1.0 Release 6) | url=http://webapp.etsi.org/workprogram/Report_WorkItem.asp?wki_id=21806 | author=3GPP | publisher=3GPP | date=2005-01-04 | access-date=2009-10-13}}</ref>
'''ISO/IEC 14496-3:2001/Amd.1:2003''' and 
'''ISO/IEC 14496-3:2001/Amd 2:2004'''.
<ref name="parametric">{{cite web | title=Parametric coding for high-quality audio, ISO/IEC 14496-3:2001/Amd 2:2004 | url=http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=39382 | author=ISO | publisher=ISO | year=2004 | access-date=2009-10-13 | url-status=live | archive-url=https://web.archive.org/web/20120104071002/http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=39382 | archive-date=2012-01-04 }}</ref>

At the time, Coding Technologies had already begun using the trade names '''AAC+''' and '''aacPlus''' for what is now known as HE-AAC v1, and '''aacPlus v2''' and '''eAAC+''' for what is now known as HE-AAC v2.