Directory of MPEG-4 Resources

Home > Computers > Multimedia > Music and Audio > Audio Formats > MPEG-4

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.

Subcategories

• Apple iPod
• MPEG-4 Standard
• Software
• VQF

Resources in This Category

• 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.

• Applications of Digital Signal Processing to Audio and Acoustics

  http://www.amazon.com/exec/obidos/ASIN/0792381300
  Book by Mark Kahrs and Karlheinz Brandenburg.

• 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.

• 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.

• 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.

• Examples of Synthesized Speech

  http://www.ims.uni-stuttgart.de/institut/mitarbeiter/moehler/synthspeech/
  Many TTS demos in several languages from different systems with links to their homepages.

• Hydrogen Audio

  https://hydrogenaud.io/
  Forum about audio coding in general with two separate boards for AAC.

• ISO/IEC

  http://standards.iso.org/ittf/PubliclyAvailableStandards/
  Publicly available standards from the International Organization for Standardization including MPEG-4 with 14496-5 containing the Audio, Visual and Systems parts.

• 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.

• Mayah

  http://www.mayah.com/
  Hard- and software company for professional broadcasting products with AAC/MP4 support.

• 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).

• MP4 Structured Audio: Developer Tools

  http://john-lazzaro.github.io/sa/
  John Lazarro and John Wawrzynek from the CS Division, UC Berkeley provide tutorials, downloads, manuals and links related to the Structured Audio format.

• Principles of digital audio

  http://www.amazon.com/exec/obidos/ASIN/0071348190
  Book by Ken C. Pohlmann.

• QuickTime development

  http://developer.apple.com/quicktime/
  Apple offers technical FAQs, knowledge base and publicly available documentation files including the MOV file format.

• Tuner2

  http://www.tuner2.com/
  List of internet radio stations using aacPlus for their low bitrate streams, among them SomaFM.com and Boomer Radio.

• Via Licensing

  http://www.vialicensing.com/
  Patent pool administrator for AAC with FAQs and overviews of royalty fees for commercial implementations.

Related Categories

• Home > Computers > Internet > Broadcasting
• Home > Computers > Internet > Protocols > RTSP
• Home > Computers > Multimedia > Digital Video
• Home > Computers > Multimedia > MPEG
• Home > Computers > Multimedia > Music and Audio > Audio Formats > MP3
• Home > Computers > Multimedia > Music and Audio > Hardware
• Home > Computers > Multimedia > Music and Audio > MIDI
• Home > World > Deutsch > Computer > Multimedia > MPEG

 

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