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g 722 1 wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 licensing 2 see also 3 references 4 external links toggle the table of contents g 722 1 4 languages deutsch 日本語 한국어 yorùbá edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia 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 licensing edit 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 edit list of codecs comparison of audio coding formats wideband audio references edit 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 picturetel announces new siren wideband audio technology licensing program thefreelibrary com 2001 03 26 archived from the original on 2012 10 13 retrieved 2009 09 10 1 2 3 polycom siren codecs faqs polycom inc archived from the original on 2014 07 09 retrieved 2014 07 16 lutzky manfred schuller gerald gayer marc krämer ulrich wabnik stefan may 2004 a guideline to audio codec delay pdf 116th aes convention fraunhofer iis audio engineering society retrieved 24 october 2019 1 2 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 itu approves polycom siren14 as new international standard businesswire com 2005 04 12 retrieved 2014 07 16 picturetel licenses audio technology suite to intel thefreelibrary com 2000 07 19 archived from the original on 2012 10 13 retrieved 2009 09 10 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 libg722_1 copying freeswitch retrieved 2014 07 16 siren7 siren14 g 719 license agreement polycom inc archived from the original on 2014 07 09 retrieved 2014 07 16 xiph org foundation 2009 celt codec feature comparison xiph org foundation archived from the original on 2009 09 12 retrieved 2009 09 07 xiph org foundation 2006 speex codec quality comparison xiph org foundation retrieved 2009 09 07 external links edit official website technical specification rfc 5577 rtp payload format for itu t recommendation g 722 1 v t e multimedia compression and container formats video compression iso iec mpeg dv mjpeg motion jpeg 2000 mpeg 1 mpeg 2 part 2 mpeg 4 part 2 asp part 10 avc part 33 ivc mpeg h part 2 hevc mpeg i part 3 vvc mpeg 5 part 1 evc part 2 lcevc itu t vceg h 120 h 261 h 262 h 263 h 264 avc h 265 hevc h 266 vvc h 267 enhanced compression model smpte vc 1 vc 2 vc 3 vc 5 vc 6 truemotion and aomedia truemotion s vp3 vp6 vp7 vp8 vp9 av1 av2 chinese standard avs1 p2 avs gb t 20090 2 16 avs2 p2 gb t 33475 2 gy t 299 1 hdr vivid gy t 358 avs3 p2 gy t 368 others apple video avs bink cinepak daala dvi ffv1 huffyuv indeo lagarith microsoft video 1 msu lossless oms video pixlet prores 422 4444 quicktime animation graphics realvideo rtvideo sheervideo smacker sorenson video spark theora thor ut wmv xeb yuls audio compression 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 flac 3gpp amr amr wb amr wb evrc evrc b evs gsm hr gsm fr gsm efr etsi ac 3 ac 4 dts bluetooth sig sbc lc3 chinese standard avs1 p10 gb t 20090 10 avs2 p3 gb t 33475 3 audio vivid gy t 363 dra gb t 22726 exac sj t 11299 4 others acelp alac asao atrac celt codec 2 isac lyra melp monkey s audio mt9 musepack optimfrog osq qcelp rcelp realaudio sd2 shn silk siren smv svopc tta true audio twinvq vmr wb vselp wavpack wma mqa aptx aptx hd aptx low latency aptx adaptive ldac lhdc llac truehd image compression iec iso ietf w3c itu t jpeg ccitt group 4 gif heic heif hevc jbig jbig2 jpeg jpeg 2000 jpeg ls jpeg xl jpeg xr jpeg xs jpeg xt png apng tiff tiff ep tiff it others av1 avif bpg djvu exr flif icer mng pgf qoi qtvr wbmp webp containers iso iec mpeg es mpeg pes mpeg ps mpeg ts iso iec 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 matroska smpte gxf mxf others 3gp and 3g2 amv asf aiff avi au bpg bink smacker bmp divx media format evo flash video heif iff m2ts matroska webm quicktime file format ratdvd realmedia riff wav mod and tod vob ifo and bup collaborations netvc mpeg la alliance for open media methods entropy arithmetic huffman modified lpc acelp celp lsp wlpc lossless lossy lz deflate lzw pcm a law µ law adpcm dpcm transforms dct fft mdct wavelet daubechies dwt lists comparison of audio coding formats comparison of video codecs list of codecs see compression methods for techniques and compression software for codecs retrieved from https en wikipedia org w index php title g 722 1 oldid 1361046956 categories audio codecs speech codecs wideband codecs itu t recommendations itu t g series recommendations hidden categories articles with short description short description matches wikidata cs1 errors missing periodical this page was last edited on 25 june 2026 at 08 17 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal 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