| 3GPP SA4: This working group of the standardization organization deals with codecs like enhanced aacPlus or AMR-WB+ used in mobile telecommunication. |
| AES Publications: All available articles and documents from the Journal of Audio Engineering Society with search tool including a CD about coding artifacts. |
| Apple: Overview of their implementation and contribution to the MPEG-4 standard. |
| Applications of Digital Signal Processing to Audio and Acoustics: Book by Mark Kahrs and Karlheinz Brandenburg. |
| Audio Research Labs: ARL is a commercial laboratory involved in subjective quality assessment methods like preparing and analyzing codec comparisons for 3GPP. |
| 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. |
| Coding Technologies: Company that invented Spectral Band Replication (SBR) and combined it with MP3 (mp3PRO) and AAC (aacPlus or HE AAC). |
| 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. |
| Doom9: Besides this forum for audio codecs there are others for container formats and video encoding in general with FAQs. |
| EE Times: "Meeting MPEG-4 advanced audio coding requirements", knowledgeable article summarizing the most important properties of AAC for hardware playback. |
| Everwicked.com: Comprehensive guides about DivX, XviD and MPEG4IP, a forum and other resources about digital audio/video coding and streaming. |
| Faac.sourceforge.net: The old Audiocoding.com forum is still available providing valuable content like FAAC compiling issues with its search tool. |
| 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). |
| 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. |
| Hydrogen Audio: Forum about audio coding in general with two separate boards for AAC. |
| IBM Composite Media Group: Overview of their implementation and contribution to the MPEG-4 standard, especially for the Systems part. |
| Introduction to Digital Audio Coding and Standards: Book by Marina Bosi and Richard E. Goldberg. |
| ISO/IEC: Publicly available standards from the International Organization for Standardization including MPEG-4 with 14496-5 containing the Audio, Visual and Systems parts. |
| 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. |
| Mayah: Hard- and software company for professional broadcasting products with AAC/MP4 support. |
| Mobiledia: Reviews, articles and forum discussions about cell phones capable of AAC/MP4/3GP playback (also called "iTunes" format sometimes, use the site search). |
| 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. |
| Mp4-tech: The web archive of the public MPEG Industry Forum mailing list with many knowledgeable participants from companies like FhG, Apple and Microsoft. |
| MPEG Audio: Official site of this MPEG subgroup with FAQs for the different standards, publicly available reference documents and software. |
| MPEG LA: Patent pool administrator for the MPEG-4 Systems part of the standard including the MP4 file format. |
| MPEG-4 Structured Audio: 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. |
| MPEG4.net: Resource for news, information and products about MPEG-4, H.264, Windows Media, High-Definition, Streaming Media and related technologies. |
| Nokia developer forum: Platform to support the implementation of their software SDKs including AAC/MP4. |
| Principles of digital audio: Book by Ken C. Pohlmann. |
| QuickTime development: Apple offers technical FAQs, knowledge base and publicly available documentation files including the MOV file format. |
| Roberto's listening tests: Provides public group comparisons of several AAC codecs and other formats at different bitrates. |
| Ross Bencina Structured Audio: The writer of AudioMulch, free soundsynthesis software, offers a SAOL/SASL reference guide and decoder resources. |
| Speech Synthesis Examples: Many TTS demos in several languages from different systems with links to their homepages. |
| 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. |
| Telos Systems: Hardware manufacturer of the Zephyr ISDN codecs for radio and television broadcasters providing articles and brochures about different AAC implementations. |
| Text-To-Speech Synthesis: Bell Labs' / Lucent Technologies multi-lingual TTS demos and introduction to this coding method. |
| Tuner2: List of internet radio stations using aacPlus for their low bitrate streams, among them SomaFM.com and Boomer Radio. |
| Via Licensing: Patent pool administrator for AAC with FAQs and overviews of royalty fees for commercial implementations. |
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