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MP4-SA Developer Tools - John Lazarro and John Wawrzynek from the CS Division, UC Berkeley provide tutorials, downloads, manuals and links related to the Structured Audio format.
Structured Audio Open Group - 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 - 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 - 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.
Everwicked.com - Comprehensive guides about DivX, XviD and MPEG4IP, a forum and other resources about digital audio/video coding and streaming.
Doom9 - Besides this forum for audio codecs there are others for container formats and video encoding in general with FAQs.
Hydrogen Audio - Forum about audio coding in general with two separate boards for AAC.
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 - Company that invented Spectral Band Replication (SBR) and combined it with MP3 (mp3PRO) and AAC (aacPlus or HE AAC).
Via Licensing - Patent pool administrator for AAC with FAQs and overviews of royalty fees for commercial implementations.
QuickTime development - Apple offers technical FAQs, knowledge base and publicly available documentation files including the MOV file format.
Mayah - Hard- and software company for professional broadcasting products with AAC/MP4 support.
AES 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 - Platform to support the implementation of their software SDKs including AAC/MP4.
Faac.sourceforge.net - The old Audiocoding.com forum is still available providing valuable content like FAAC compiling issues with its search tool.
Machine Listening - 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 - 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 - "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 - Provides public group comparisons of several AAC codecs and other formats at different bitrates.
Tuner2 - List of internet radio stations using aacPlus for their low bitrate streams, among them SomaFM.com and Boomer Radio.
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 - The latest headlines about MPEG-4, Windows Media, Streaming Media and related technologies.
MPEG4.net Press releases - Announcements of new products from companies or events from organizations related to MPEG-4 and other technologies.
MPEG4.net Events - Upcoming MPEG-4 and Streaming Media related calendar of events.
MPEG4.net Resources - New sources of information like web sites, documentation or tests for MPEG-4 and related technologies.
MPEG LA - Patent pool administrator for the MPEG-4 Systems part of the standard including the MP4 file format.
3GPP SA4 - This working group of the standardization organization deals with codecs like enhanced aacPlus or AMR-WB+ used in mobile telecommunication.
Digital Radio Mondiale - 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.
Audio Research Labs - ARL is a commercial laboratory involved in subjective quality assessment methods like preparing and analyzing codec comparisons for 3GPP.
Facial Animation - 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 - Bell Labs' / Lucent Technologies multi-lingual TTS demos and introduction to this coding method.
Speech Synthesis Examples - Many TTS demos in several languages from different systems with links to their homepages.
Hydrogen Audio - Active forum topics in AAC - General and AAC - Tech as well as in MPEG4 Discussion.
Mobiledia - Reviews, articles and forum discussions about cell phones capable of AAC/MP4/3GP playback (also called "iTunes" format sometimes, use the site search).
EE Times - "Meeting MPEG-4 advanced audio coding requirements", knowledgeable article summarizing the most important properties of AAC for hardware playback.
ISO/IEC - Publicly available standards from the International Organization for Standardization including MPEG-4 with 14496-5 containing the Audio, Visual and Systems parts.
Principles of digital audio - Book by Ken C. Pohlmann.
Applications of Digital Signal Processing to Audio and Acoustics - Book by Mark Kahrs and Karlheinz Brandenburg.
Introduction to Digital Audio Coding and Standards - Book by Marina Bosi and Richard E. Goldberg.
IBM Composite Media Group - Overview of their implementation and contribution to the MPEG-4 standard, especially for the Systems part.
Apple - Overview of their implementation and contribution to the MPEG-4 standard.
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