- MPEG-4 Structured Audio - http://sound.media.mit.edu/mpeg4/
Technical information and developer resources from the Machine Listening Group at the MIT Media Laboratory, the official homepage for this format maintained by Eric Scheirer.
- MP4-SA Developer Tools - http://www.cs.berkeley.edu/~lazzaro/sa/
John Lazarro and John Wawrzynek from the CS Division, UC Berkeley provide tutorials, downloads, manuals and links related to the Structured Audio format.
- Ross Bencina Structured Audio - http://www.audiomulch.com/sa/
The writer of AudioMulch, free soundsynthesis software, offers a SAOL/SASL reference guide and decoder resources.
- Structured Audio Open Group - http://lsiwww.epfl.ch/saog/
The main goal of the SAOG was to implement Structured Audio (SA) in open source applications offering a portal for their users with forum and downloads of samples and software.
- Audiocoding.com - http://www.audiocoding.com/
The open source project FAAC includes an AAC encoder and decoder (FAAD2) with source code packages, developer mailing list, knowledge base, news section and user forum.
- Fraunhofer IIS - http://www.iis.fraunhofer.de/amm/techinf/mpeg4/audio.html
Information about the different parts of MPEG-4 Natural or General Audio (GA) from one of the inventors of these formats, see also their page about MPEG-2 AAC.
- MPEG Audio - http://www.tnt.uni-hannover.de/project/mpeg/audio/
Official site of this MPEG subgroup with FAQs for the different standards, publicly available reference documents and software.
- ISO/IEC - http://www.iso.org/iso/en/ittf/PubliclyAvailableStandards/
Publicly available standards from the International Organization for Standardization including MPEG-4 with 14496-5 containing the Audio, Visual and Systems parts.
- Everwicked.com - http://www.everwicked.com/
Comprehensive guides about DivX, XviD and MPEG4IP, a forum and other resources about digital audio/video coding and streaming.
- Doom9 - http://forum.doom9.org/forumdisplay.php?forumid=11
Besides this forum for audio codecs there are others for container formats and video encoding in general with FAQs.
- Hydrogen Audio - http://www.hydrogenaudio.org/
Forum about audio coding in general with two separate boards for AAC.
- Mp4-tech - http://lists.mpegif.org/pipermail/mp4-tech/
The web archive of the public MPEG Industry Forum mailing list with many knowledgeable participants from companies like FhG, Apple and Microsoft.
- Coding Technologies - http://www.codingtechnologies.com/
Company that invented Spectral Band Replication (SBR) and combined it with MP3 (mp3PRO) and AAC (aacPlus or HE AAC).
- Via Licensing - http://www.vialicensing.com/
Patent pool administrator for AAC with FAQs and overviews of royalty fees for commercial implementations.
- QuickTime development - http://developer.apple.com/quicktime/
Apple offers technical FAQs, knowledge base and publicly available documentation files including the MOV file format.
- Mayah - http://www.mayah.com/
Hard- and software company for professional broadcasting products with AAC/MP4 support.
- AES Publications - http://www.aes.org/publications/
All available articles and documents from the Journal of Audio Engineering Society with search tool including a CD about coding artifacts.
- Nokia developer forum - http://discussion.forum.nokia.com/forum/
Platform to support the implementation of their software SDKs including AAC/MP4.
- Faac.sourceforge.net - http://faac.sourceforge.net/oldsite/phorum/
The old Audiocoding.com forum is still available providing valuable content like FAAC compiling issues with its search tool.
- Machine Listening - http://web.media.mit.edu/~tristan/Classes/MAS.945/technical.html
Reading list for an MIT seminar, most of the mentioned publications are directly available on their web server or linked to Amazon's book section.
- Telos Systems - http://www.telos-systems.com/techtalk/
Hardware manufacturer of the Zephyr ISDN codecs for radio and television broadcasters providing articles and brochures about different AAC implementations.
- Dissertation of Dr. Ye Wang - http://sivut.koti.soon.fi/lasse55/wangye_PhD_final%20collated.pdf
"Selected advances in audio compression and compressed domain processing", comprehensive overview of internet and mobile communication codecs and new methods for improvement.
- Roberto's listening tests - http://www.rjamorim.com/test/
Provides public group comparisons of several AAC codecs and other formats at different bitrates.
- Tuner2 - http://www.tuner2.com/
List of internet radio stations using aacPlus for their low bitrate streams, among them SomaFM.com and Boomer Radio.
- MPEG4.net - http://www.mpeg4.net/
Resource for news, information and products about MPEG-4, H.264, Windows Media, High-Definition, Streaming Media and related technologies.
- MPEG4.net News - http://www.mpeg4.net/rss/mp4news.xml
The latest headlines about MPEG-4, Windows Media, Streaming Media and related technologies.
- MPEG4.net Press releases - http://www.mpeg4.net/rss/mp4press.xml
Announcements of new products from companies or events from organizations related to MPEG-4 and other technologies.
- MPEG4.net Events - http://www.mpeg4.net/rss/mp4events.xml
Upcoming MPEG-4 and Streaming Media related calendar of events.
- MPEG4.net Resources - http://www.mpeg4.net/rss/mp4resource.xml
New sources of information like web sites, documentation or tests for MPEG-4 and related technologies.
- MPEG LA - http://www.mpegla.com/m4s/
Patent pool administrator for the MPEG-4 Systems part of the standard including the MP4 file format.
- 3GPP SA4 - http://www.3gpp.org/TB/SA/SA4/SA4.htm
This working group of the standardization organization deals with codecs like enhanced aacPlus or AMR-WB+ used in mobile telecommunication.
- Apple - http://www.apple.com/mpeg4/
Overview of their implementation and contribution to the MPEG-4 standard.
- Digital Radio Mondiale - http://www.drm.org/
DRM is a world-wide initiative to use analog AM radio for digital sound and services implementing aacPlus at very low bitrates, often mixed up with Digital Rights Management for copy protection.
- EE Times - http://www.eetimes.com/article/printableArticle.jhtml?articleID=12801919&url_prefix=story&sub_taxonomyID=
"Meeting MPEG-4 advanced audio coding requirements", knowledgeable article summarizing the most important properties of AAC for hardware playback.
- Audio Research Labs - http://www.audioresearchlabs.com/
ARL is a commercial laboratory involved in subjective quality assessment methods like preparing and analyzing codec comparisons for 3GPP.
- Facial Animation - http://www.research.att.com/projects/AnimatedHead/
AT&T Labs develops a computer human interface using 2D and 3D talking head-and-shoulder models driven by a Text-To-Speech synthesizer (TTS).
- Text-To-Speech Synthesis - http://www.bell-labs.com/project/tts/
Bell Labs' / Lucent Technologies multi-lingual TTS demos and introduction to this coding method.
- Speech Synthesis Examples - http://www.ims.uni-stuttgart.de/~moehler/synthspeech/
Many TTS demos in several languages from different systems with links to their homepages.
- Hydrogen Audio - http://www.hydrogenaudio.org/forums/ssi.php?a=out&f=13,14,44&show=20&type=rss
Active forum topics in AAC - General and AAC - Tech as well as in MPEG4 Discussion.
- IBM Composite Media Group - http://www.research.ibm.com/mpeg4/Projects/
Overview of their implementation and contribution to the MPEG-4 standard, especially for the Systems part.
- Mobiledia - http://www.mobiledia.com/
Reviews, articles and forum discussions about cell phones capable of AAC/MP4/3GP playback (also called "iTunes" format sometimes, use the site search).
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