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Since MPEG-4 is a comprehensive multimedia standard, this category lists sites about several audio formats, all being part of MPEG-4 Audio. "Natural" coding of sound: Advanced Audio Coding (AAC, also its MPEG-2 version), TwinVQ (aka VQF), CELP, Parametric Codecs (HVXC, HILN). "Synthetic" coding of sound: Structured Audio Orchestra Language (SAOL) and Structured Audio Score Language (SASL), Text-To-Speech (TTS). The container format MP4 also belongs to this category, as long as it includes audio-only tracks with *.m4a, *.m4b or *.mp4 file extension and not video or other parts of the MPEG-4 standard like 2D/3D graphics. Due to the new developments in mobile communication the 3GPP/3GP2 standard and its audio codecs (several AMR and AAC variants) should be included here, also because their container formats *.3gp and *.3g2 are very similar to MP4, although not the same.

Apple_iPod@	MPEG-4 Standard@
Audio	Broadcasting
RTSP	Digital Video
MPEG	MP3
Software	Hardware
MIDI	MPEG
VQF@	NewsGroup (Usenet)
NewsGroup (Usenet)

• 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.
• 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.
• 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).
• Mobiledia Cell phone news, reviews, coverage details (by US zipcode) and discussion forums.
• Mobiledia Cell phone advice, reviews and news.
• 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.
• 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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