G.722.1 - HandWiki

Short description: ITU-T Recommendation G.722.1

Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss
Status	In force
Year started	1999
Latest version	(05/05)May 2005
Organization	ITU-T
Base standards	G.711, G.722
Related standards	G.722.2, G.726
Domain	audio compression
License	Freely available
Website	https://www.itu.int/rec/T-REC-G.722.1

G.722.1 is a licensed royalty-free ITU-T standard audio codec providing high quality, moderate bit rate (24 and 32 kbit/s) wideband (50 Hz – 7 kHz audio bandwidth, 16 ksps (kilo-samples per second) audio coding.[1] It is a partial implementation of Siren 7 audio coding format (which offers bit rates 16, 24, 32 kbit/s) developed by PictureTel Corp. (now Polycom, Inc.).[2][3] Its official name is Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss. It uses a modified discrete cosine transform (MDCT) 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.[5] It is an implementation of the mono version of Polycom'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 lapped transform technology, using a 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 wideband ITU audio codecs is sometimes confusing. There are three principal codecs, which are unrelated, but all carrying the G.722 label. G.722 is the original 7 kHz codec, using ADPCM and operating at 48–64 kbit/s. G.722.1, another 7 kHz codec, operates at half the data rate while delivering comparable or better quality than G.722, but is a transform-based codec. G.722.1 Annex C is very similar to G.722.1, but provides twice the audio bandwidth, 14 kHz. And G.722.2, which operates on wideband speech and delivers very low bitrates, is an ACELP-based algorithm.

Contents

• 1 Licensing
• 2 See also
• 3 References
• 4 External links

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

• List of codecs
• Comparison of audio coding formats
• Wideband audio

References

1. ↑ "G.722.1 : Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss". https://www.itu.int/rec/T-REC-G.722.1. 
2. ↑ Business Wire (2001-03-26). "PictureTel Announces New Siren Wideband Audio Technology Licensing Program". thefreelibrary.com. http://www.thefreelibrary.com/PictureTel+Announces+New+Siren+Wideband+Audio+Technology+Licensing...-a072261882. 
3. ↑ 3.0 3.1 3.2 "Polycom Siren/Codecs FAQs". Polycom, Inc.. http://www.polycom.com/company/about-us/technology/siren/siren-faq.html. 
4. ↑ Lutzky, Manfred; Schuller, Gerald; Gayer, Marc; Krämer, Ulrich; Wabnik, Stefan (May 2004). "A guideline to audio codec delay". 116th AES Convention. Audio Engineering Society. https://www.iis.fraunhofer.de/content/dam/iis/de/doc/ame/conference/AES-116-Convention_guideline-to-audio-codec-delay_AES116.pdf. Retrieved 24 October 2019. 
5. ↑ 5.0 5.1 ITU-T (May 2005) (ZIP, PDF). ITU-T G.722.1, 05/2005. ITU-T. p. i. http://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-G.722.1-200505-I!!SOFT-ZST-E&type=items. Retrieved 2009-09-10. 
6. ↑ "ITU Approves Polycom Siren14 as New International Standard". businesswire.com. 2005-04-12. http://www.businesswire.com/news/home/20050412005325/en/ITU-Approves-Polycom-Siren14-International-Standard---. 
7. ↑ Business Wire (2000-07-19). "PictureTel Licenses Audio Technology Suite to Intel". thefreelibrary.com. http://www.thefreelibrary.com/PictureTel+Licenses+Audio+Technology+Suite+to+Intel.-a063558475. 
8. ↑ Polycom, Inc.. "Polycom Siren/Codecs FAQs – What are the terms on the free license?". Polycom, Inc.. http://www.polycom.com/company/about-us/technology/siren/siren-faq.html#faq40. 
9. ↑ "libg722_1 – COPYING". FreeSWITCH. https://stash.freeswitch.org/projects/FS/repos/freeswitch/browse/libs/libg722_1/COPYING. 
10. ↑ Polycom, Inc.. "Siren7/Siren14/G.719 License Agreement". Polycom, Inc.. http://www.polycom.com/company/about-us/technology/siren/siren-license-agreement.html. 
11. ↑ Xiph.Org Foundation (2009). "CELT – Codec Feature Comparison". Xiph.Org Foundation. http://www.celt-codec.org/comparison/. 
12. ↑ Xiph.Org Foundation (2006). "Speex – Codec Quality Comparison". Xiph.Org Foundation. http://www.speex.org/comparison/. 

External links

• – technical specification
• RFC 5577 – RTP Payload Format for ITU-T Recommendation G.722.1

v t e Multimedia compression and container formats
Videocompression	ISO, IEC, MPEG MJPEG Motion JPEG 2000 MPEG-1 MPEG-2 Part 2 MPEG-4 Part 2 / ASP Part 10 / AVC MPEG-H Part 2 / HEVC MPEG-I Part 3 / VVC ITU-T, VCEG H.120 DCT H.261 H.262 H.263 H.264 / AVC H.265 / HEVC H.266 / VVC DV SMPTE VC-1 VC-2 VC-3 VC-5 TrueMotion TrueMotion S DCT VP3 VP6 VP7 VP8 VP9 AV1 Others Apple Video AVS Bink Cinepak Daala DVI EVC FFV1 Huffyuv Indeo Lagarith Microsoft Video 1 MSU Lossless OMS Video Pixlet ProRes 422 ProRes 4444 QuickTime Animation Graphics RealVideo RTVideo SheerVideo Smacker Sorenson Video/Spark Theora Thor WMV XEB YULS
Audiocompression	ISO, IEC, MPEG MPEG-1 Layer II Multichannel MPEG-1 Layer I MPEG-1 Layer III (MP3) AAC HE-AAC AAC-LD MPEG Surround MPEG-4 ALS MPEG-4 SLS MPEG-4 DST MPEG-4 HVXC MPEG-4 CELP MPEG-D USAC MPEG-H 3D Audio ITU-T G.711 A-law µ-law G.718 G.719 G.722 G.722.1 G.722.2 G.723 G.723.1 G.726 G.728 G.729 G.729.1 IETF Opus iLBC Speex Vorbis 3GPP AMR AMR-WB AMR-WB+ EVRC EVRC-B EVS GSM-HR GSM-FR GSM-EFR ETSI AC-3 AC-4 DTS Others ACELP ALAC Asao ATRAC AVS CELT Codec 2 DRA FLAC iSAC Monkey's Audio TTA True Audio MT9 Musepack OptimFROG OSQ QCELP RCELP RealAudio RTAudio SD2 SHN SILK Siren SMV SVOPC TwinVQ VMR-WB VSELP WavPack WMA MQA aptX aptX HD aptX Low Latency aptX Adaptive LDAC LHDC LLAC
Imagecompression	IEC, ISO,IETF, W3C,ITU-T, JPEG CCITT Group 4 DCT HEIF HEVC JPEG JPEG XR JPEG XT TIFF/EP Arithmetic JBIG JBIG2 JPEG-LS JPEG 2000 LZ GIF PNG TIFF TIFF/IT Others APNG BPG DjVu EXR FLIF ICER MNG PGF QTVR WBMP WebP
Containers	ISO, IEC MPEG-ES MPEG-PES MPEG-PS MPEG-TS ISO base media file format MPEG-4 Part 14 (MP4) Motion JPEG 2000 MPEG-21 Part 9 MPEG media transport ITU-T H.222.0 T.802 IETF RTP Ogg SMPTE GXF MXF Others 3GP and 3G2 AMV ASF AIFF AVI AU BPG Bink Smacker BMP DivX Media Format EVO Flash Video IFF M2TS Matroska WebM QuickTime File Format RatDVD RealMedia RIFF WAV MOD and TOD VOB, IFO and BUP
Collaborations	NETVC MPEG LA HEVC Advance
Methods	Discrete cosine transform DCT MDCT Entropy Arithmetic Huffman Modified FFT LPC ACELP CELP LSP WLPC Lossless Lossy LZ DEFLATE LZW PCM A-law µ-law ADPCM DPCM Transform Wavelet Daubechies DWT Transform
Lists	Comparison of audio coding formats Comparison of video codecs List of codecs
See Compression methods for techniques and Compression software for codecs

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