G.722.1

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G.722.1
Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss
audio compression
LicenseFreely available
Websitehttps://www.itu.int/rec/T-REC-G.722.1

G.722.1 is a licensed

audio data compression algorithm.[4]

G.722.1 Annex C (or G.722.1C) is a low-complexity extension mode to G.722.1, which doubles the algorithm to permit 14 kHz audio bandwidth using a 32 kHz audio sample rate, at 24, 32, and 48 kbit/s. It is included in the official ITU-T Recommendation G.722.1. The name of this annex is Annex C – 14 kHz mode at 24, 32, and 48 kbit/s.

Siren 14 audio coding format.[6][3]

G.722.1 is the successor to PT716plus developed by PictureTel Corp. (now Polycom, Inc.),[3] which has been used in videoconferencing systems for many years. As ITU-T Recommendation G.722.1, it was approved on September 30, 1999 after a four-year selection process involving extensive testing.[7] G.722.1/Annex C was approved by ITU-T on May 14, 2005.[5]

G.722.1 is a transform-based compressor that is optimized for both speech and music. The G.722.1 algorithm is based on

Modulated Lapped Transform
(MLT), a type of MDCT. The computational complexity is quite low (5.5 floating-point MIPS) for an efficient high-quality compressor, and the algorithmic delay end-to-end is 40 ms.

The numbering of the

ACELP
-based algorithm.

Licensing

G.722.1 is available under a royalty-free license by Polycom Corporation, who owns all rights.[8][9][10][11][12] Licensees also receive the right to use Polycom's 16 kbit/s decoder extension of G.722.1, as well as G.722.1 Annex C, and Polycom's IP within the new 20 kHz ITU fullband codec, G.719.

See also

References

  1. ^ "G.722.1 : Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss". www.itu.int. Archived from the original on 2016-04-24. Retrieved 2019-11-15.
  2. ^ Business Wire (2001-03-26). "PictureTel Announces New Siren Wideband Audio Technology Licensing Program". thefreelibrary.com. Archived from the original on 2012-10-13. Retrieved 2009-09-10. {{cite web}}: |author= has generic name (help)
  3. ^ a b c "Polycom Siren/Codecs FAQs". Polycom, Inc. Archived from the original on 2014-07-09. Retrieved 2014-07-16.
  4. Fraunhofer IIS. Audio Engineering Society
    . Retrieved 24 October 2019.
  5. ^ a b ITU-T (May 2005). "ITU-T G.722.1, 05/2005" (ZIP, PDF). ITU-T: i. Retrieved 2009-09-10. {{cite journal}}: Cite journal requires |journal= (help)
  6. ^ "ITU Approves Polycom Siren14 as New International Standard". businesswire.com. 2005-04-12. Retrieved 2014-07-16.
  7. ^ Business Wire (2000-07-19). "PictureTel Licenses Audio Technology Suite to Intel". thefreelibrary.com. Archived from the original on 2012-10-13. Retrieved 2009-09-10. {{cite web}}: |author= has generic name (help)
  8. ^ Polycom, Inc. "Polycom Siren/Codecs FAQs – What are the terms on the free license?". Polycom, Inc. Archived from the original on 2014-07-09. Retrieved 2014-07-16.
  9. ^ "libg722_1 – COPYING". FreeSWITCH. Retrieved 2014-07-16.
  10. ^ Polycom, Inc. "Siren7/Siren14/G.719 License Agreement". Polycom, Inc. Archived from the original on 2014-07-09. Retrieved 2014-07-16.
  11. ^ Xiph.Org Foundation (2009). "CELT – Codec Feature Comparison". Xiph.Org Foundation. Archived from the original on 2009-09-12. Retrieved 2009-09-07.
  12. ^ Xiph.Org Foundation (2006). "Speex – Codec Quality Comparison". Xiph.Org Foundation. Retrieved 2009-09-07.

External links

  • Official website Edit this at Wikidata – technical specification
  • RFC 5577 – RTP Payload Format for ITU-T Recommendation G.722.1
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