Overview
ISO/IEC 14496-5:2001/Amd 37:2015 is an important amendment to the international standard for information technology related to coding audio-visual objects. This standard focuses specifically on Part 5: Reference software of the MPEG-4 suite, enhancing the reference software that supports the Advanced Audio Coding (AAC) profiles. The 2015 amendment introduces new levels for AAC profiles, provides support for the uniDRC dynamic range compression technology, and includes critical corrections to AAC block length parameters.
Developed and maintained by ISO/IEC Joint Technical Committee 1 (JTC 1), Subcommittee SC 29, this amendment ensures that the reference software stays up-to-date with technological advancements and improvements in audio encoding standards.
Key Topics
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New AAC Profile Levels
The amendment adds new profile levels which expand the capabilities and performance of AAC audio coding. This allows better adaptability for various audio applications that require different bitrate and quality levels.
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uniDRC Support
uniDRC (Universal Dynamic Range Control) is a technology for dynamic range compression that enhances the listening experience across different playback environments. The inclusion of uniDRC support in the reference software enables improved audio loudness control and playback consistency.
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AAC Block Length Parameter Corrections
Updates to AAC block length parameters correct previous inaccuracies and improve codec compatibility. These corrections ensure accurate audio decoding and enhance quality across platforms using the MPEG-4 AAC codec.
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Reference Software Update
This amendment updates the electronic annex of the existing ISO/IEC 14496-5 standard by replacing subdirectories and files with the new versions containing these improvements and corrections.
Applications
The improvements and updates made in ISO/IEC 14496-5:2001/Amd 37:2015 have significant practical value for:
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Audio Codec Developers
Software and hardware companies developing AAC codecs benefit from the updated reference software, ensuring compliance with the latest international standards and support for new AAC levels.
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Broadcast and Streaming Services
Media providers can take advantage of dynamic range compression via uniDRC to offer consistent audio experiences across diverse playback devices and listening environments.
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Multimedia Content Creation
Content creators working with audio-visual media can leverage enhanced AAC profiles to produce high-quality audio tracks optimized for modern delivery platforms.
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Consumer Electronics Manufacturers
Device manufacturers incorporating audio decoding capabilities (e.g., smartphones, TVs, portable media players) can ensure superior audio reproduction by following the amended reference software specifications.
Related Standards
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ISO/IEC 14496-3:2009 (MPEG-4 Audio)
Defines the AAC profiles and extensions referenced and supported by the amendment, including updates from Amendments 4 and 5, and Correction 6.
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ISO/IEC Directives, Part 1 and 2
Governs the editorial and procedural framework used to develop and maintain this and related standards.
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ISO/IEC JTC 1 SC 29 Standards
Include various standards for coding audio, picture, multimedia, and hypermedia information, forming the broader MPEG audiovisual coding suite.
Keywords: ISO/IEC 14496-5 amendment 37, AAC profiles, uniDRC dynamic range compression, AAC block length correction, MPEG-4 reference software, audio coding standard, international audio codec standards, multimedia audio standard, ISO audio-video coding, MPEG-4 AAC enhancements.
Open preview (PDF)Information technology — Coding of audio-visual objects — Part 5: Reference software — Amendment 37: New levels for the AAC profiles, uniDRC support, AAC block length parameter corrections
