Preface
Update(s) to this standard are available.
Overview
ISO/IEC 14496-3 (MPEG-4 Audio) is a new kind of audio standard that integrates many different types of audio coding: natural sound with synthetic sound, low bitrate delivery with high-quality delivery, speech with music, complex soundtracks with simple ones, and traditional content with interactive and virtual-reality content. By standardizing individually sophisticated coding tools as well as a novel, flexible framework for audio synchronization, mixing, and downloaded post-production, the developers of the MPEG-4 Audio standard have created new technology for a new, interactive world of digital audio.
MPEG-4, unlike previous audio standards created by ISO/IEC and other groups, does not target a single application such as real-time telephony or high-quality audio compression. Rather, MPEG-4 Audio is a standard that applies to every application requiring the use of advanced sound compression, synthesis, manipulation, or playback. The subparts that follow specify the state-of-the-art coding tools in several domains; however, MPEG-4 Audio is more than just the sum of its parts. As the tools described here are integrated with the rest of the MPEG-4 standard, exciting new possibilities for object-based audio coding, interactive presentation, dynamic soundtracks, and other sorts of new media, are enabled.
Since a single set of tools is used to cover the needs of a broad range of applications, interoperability is a natural feature of systems that depend on the MPEG-4 Audio standard. A system that uses a particular coder - for example a real-time voice communication system making use of the MPEG-4 speech coding toolset - can easily share data and development tools with other systems, even in different domains, that use the same tool - for example a voicemail indexing and retrieval system making use of MPEG-4 speech coding.
The remainder of this Introduction gives a more detailed overview of the capabilities and functioning of MPEG-4 Audio. First a discussion of concepts, that have changed since the MPEG-2 audio standards, is presented. Then the MPEG-4 Audio toolset is outlined.
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CAN/CSA-ISO/IEC 14496-3I-06 - Amendment 9:2009 to CAN/CSA-ISO/IEC 14496-3-06, Information technology - Coding of audio-visual objects - Part 3: Audio - Amendment 9: Enhanced low delay AAC (Adopted Amendment 9:2008 to ISO/IEC 14496-3:2005)
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CAN/CSA-ISO/IEC 14496-3H-06 - Amendment 8:2009 to CAN/CSA-ISO/IEC 14496-3-06, Information technology - Coding of audio-visual objects - Part 3: Audio - Amendment 8: MP4FF box for original audio file information (Adopted Amendment 8:2008 to ISO/IEC 14496-3:2005)
Withdrawn
CAN/CSA-ISO/IEC 14496-3E-06 - Amendment 5:2008 to CAN/CSA-ISO/IEC 14496-3-06, Information technology - Coding of audio-visual objects - Part 3: Audio - Amendment 5: BSAC extensions and transport of MPEG surround (Adopted Amendment 5:2007 to ISO/IEC 14496-3:2005)
Withdrawn
CAN/CSA-ISO/IEC 14496-3C-06 - Amendment 3:2008 to CAN/CSA-ISO/IEC 14496-3-06, Information technology - Coding of audio-visual objects - Part 3: Audio - Amendment 3: Scalable lossless coding (SLS) (Adopted Amendment 3:2006 to ISO/IEC 14496-3:2005)
Withdrawn
CAN/CSA-ISO/IEC 14496-3B-06 - Amendment 2:2006 to CAN/CSA-ISO/IEC 14496-3-06, Information Technology - Coding of Audio-Visual Objects - Part 3: Audio - Amendment 2: Audio Lossless Coding (ALS), New Audio Profiles and BSAC Extensions (Adopted Amendment 2:2006 to ISO/IEC 14496-3:2005)
Withdrawn
CAN/CSA-ISO/IEC 14496-3A-06 - Amendment 1:2007 to CAN/CSA-ISO/IEC 14496-3-06, Information Technology - Coding of Audio-Visual Objects - Part 3: Audio - Amendment 1: Low Delay AAC Profile (Adopted Amendment 1:2007 to ISO/IEC 14496-3:2005)
Withdrawn
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