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Scalable Lossless Coding

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Scalable Lossless Coding

Scalable Lossless Coding
Developed by ISO
Type of format Audio compression format
Contained by MP4
Standard(s) ISO/IEC 14496-3

MPEG-4 SLS allows for having both a lossy layer and a lossless correction layer similar to Wavpack Hybrid, OptimFROG DualStream and DTS-HD Master Audio, allowing for backwards compatibility to MPEG AAC-compliant bitstreams. MPEG-4 SLS can also work without a lossy layer (a.k.a. "SLS Non-Core"), in which case it will not be backwards compatible,[4] Lossy compression of files is necessary for files that need to be streamed to the Internet or played in devices with limited storage.

With DRM, ripping of the lossless data or playback on non DRM-enabled devices could be disabled.

MPEG-4 SLS is not related in any way to MPEG-4 ALS (Audio Lossless Coding).

Background

Market demand for highly compressed, lossy audio compression technologies is slowly diminishing, as network and storage technologies continually improve their ability to deliver high-sampling-rate, high-resolution audio.

New lossless audio coding technologies that need higher bandwidth and larger storage capacities may now be appropriate for many applications and have been gaining attention in recent years. In addressing this need, MPEG issued a Call for Proposals (CfP) in October 2002 to solicit a technology that could address all these needs.

The CfP requested proposals for a I2R) technologies were adopted for the scalable to lossless coding (14496-3/AMD5) architecture Reference Model 0.

I2R offers a fully scalable to lossless audio coding solution. On top of the core AAC codec, a scalable extension layer increases the signal-to-noise ratio, reaching lossless quality at data rates comparable to those of current pure lossless audio codecs, that is, at average compression ratios of about 58%.

The scalability of the extension makes this combination a coding solution for production environments, where the result is to be transmitted to several recipients through channels of differing bandwidth. Furthermore, for private and professional use in music archives, this enables storing the original music data and transferring compressed copies (e.g. to portable devices) without transcoding.

Licensing

The Licensing Administrator for the MPEG-4 Audio patent pool is Via Licensing Corporation. Licensors offering their SLS patents through the Via Licensing Corporation's licensing program include A*STAR Exploit Technologies Pte Ltd (Singapore), Fraunhofer IIS (Germany), and Nippon Telegraph and Telephone Corporation (Japan).[5][6]

The licensing fees varies - e.g. a licensee shall pay $0.098 to the Via Licensing Corporation for each copy of PC software decoder sold or supplied.[7]

Releases

In 2011, Los Angeles based hip hop group

See also

References

External links

  • International Organisation for Standardisation MPEG-4 SLS page
  • MPEG-4 SLS - Multi
  • Fraunhofer
  • A-Star press release
  • Fraunhofer paper
  • HD-AAC.com
  • Official MPEG web site
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