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siren codec 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 editions 2 software support 3 licensing 4 see also 5 references 6 external links toggle the table of contents siren codec 5 languages deutsch 한국어 polski русский 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 audio codec siren is a family of patented transform based wideband audio coding formats and their audio codec implementations developed and licensed by picturetel corporation acquired by polycom inc in 2001 1 there are three siren codecs siren 7 siren 14 and siren 22 editions edit siren 7 or siren7 or simply siren provides 7 khz audio bit rates 16 24 32 kbit s and sampling frequency 16 khz siren is derived from picturetel s pt716plus algorithm 2 in 1999 itu t approved g 722 1 recommendation which is based on siren 7 algorithm it was approved after a four year selection process involving extensive testing 2 g 722 1 provides only bit rates 24 and 32 kbit s and does not support siren 7 s bit rate 16 kbit s 3 4 the algorithm of siren 7 is identical to its successor g 722 1 although the data formats are slightly different siren 14 or siren14 provides 14 khz audio bit rates 24 32 48 kbit s for mono 48 64 96 kbit s for stereo and sampling frequency 32 khz siren 14 supports stereo and mono audio it offers 40 millisecond algorithmic delay using 20 millisecond frame lengths the mono version of siren 14 became itu t g 722 1c 14 khz 24 32 48 kbit s in april 2005 5 6 7 the algorithm is based on transform coding technology using a modulated lapped transform mlt 8 a type of discrete cosine transform dct 9 or modified discrete cosine transform mdct 10 siren 22 or siren22 provides 22 khz audio sampling frequency 48 khz bit rates 64 96 128 kbit s stereo and 32 48 64 kbit s mono siren 22 offers 40 millisecond algorithmic delay using 20 millisecond frame lengths in may 2008 itu t approved the new g 719 full band codec which is based on polycom siren 22 audio technology and ericsson s advanced audio techniques 11 12 software support edit siren 7 is commonly used in videoconferencing systems and is also part of microsoft office communicator when using a v conferencing microsoft office communications server uses siren 7 during audio conferencing with the default office communicator client point to point audio is by default performed using microsoft s proprietary codec rtaudio when a call is promoted into an audio conference any time 3 or more participants have joined the codec is switched on the fly to siren this is done for performance reasons note that even if the conference is reduced to below 3 participants ocs does not demote the conference to be point to point it remains an a v conference until the conference is terminated in windows xp and later versions of windows the siren 7 codec is implemented in systemroot system32 sirenacm dll it is used by msn messenger and live messenger for sending and receiving voice clips and also as one of the available codecs for the computer call feature 13 14 15 freeswitch communication open source software can do transcoding conferencing and bridging of siren 7 g 722 1 and siren 14 g 722 1c audio formats 16 17 18 amsn an open source windows live messenger clone uses for siren audio compression and decompression the libsiren library an open source implementation of the codec written by amsn developer youness alaoui kakaroto 19 the libsiren library has also been copied into libmsn and into the msn pecan project which provides plug in for pidgin and adium instant messaging clients 19 20 21 22 23 licensing edit usage of siren 7 and siren 14 audio coding formats require the licensing of patents from polycom in most countries a royalty free licence for siren 7 and siren 14 is available from polycom if certain fairly basic conditions are met 4 17 24 25 26 27 28 usage of siren 22 also requires the licensing of patents from polycom 26 see also edit comparison of audio coding formats g 722 1 references edit 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 picturetel licenses audio technology suite to intel thefreelibrary com 2000 07 19 archived from the original on 2012 10 13 retrieved 2009 09 10 2008 08 05 polycom enables acceleration of hd voice adoption by offering royalty free codec deprecated link archived 2013 02 01 at archive today retrieved 2009 09 07 1 2 polycom siren g 722 1 faqs polycom inc retrieved 2009 09 07 itu approves polycom siren14 as new international standard business wire april 12 2005 archived from the original on january 13 2008 retrieved september 7 2009 via findarticles polycom siren 14 g 722 1c polycom inc retrieved 2009 09 07 itu approves polycom siren14 as new international standard businesswire com 2005 04 12 retrieved 2009 09 10 siren 14 information for prospective licensees pdf retrieved 2010 06 08 hersent olivier petit jean pierre gurle david 2005 beyond voip protocols understanding voice technology and networking techniques for ip telephony john wiley sons p 55 isbn 9780470023631 britanak vladimir rao k r 2017 cosine sine modulated filter banks general properties fast algorithms and integer approximations springer p 478 isbn 9783319610801 polycom siren 22 polycom inc retrieved 2009 09 07 g 719 the first itu t standard for full band audio pdf polycom inc april 2009 retrieved 2009 09 07 siren multimediawiki retrieved 2009 09 07 mplayer status of codecs support multimediawiki retrieved 2009 09 07 microsoft november 2001 media support in the microsoft windows real time communications platform microsoft retrieved 2009 09 07 freeswitch first to support polycom s 32khz hd audio freeswitch 2008 12 15 archived from the original on 2009 05 08 retrieved 2009 09 07 1 2 libg722_1 copying freeswitch retrieved 2014 07 19 libg722_1 readme freeswitch retrieved 2014 07 19 1 2 kakaroto 2008 02 12 msn protocol documentation archived 2013 05 24 at the wayback machine pidgin im mailinglist retrieved 2009 09 08 msn pecan 0 0 18 released now with voice clips support msn pecan 2009 02 16 retrieved 2014 07 19 msn pecan msn pecan retrieved 2009 09 07 libmsn is a reusable open source fully documented library for connecting to microsoft s msn messenger service libmsn project at sourceforge net 2009 retrieved 2009 09 07 scm repositories libmsn libsiren libmsn project at sourceforge net 2009 retrieved 2009 09 07 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 1 2 siren7 siren14 g 719 license info polycom inc retrieved 2009 09 07 polycom siren 14 g 722 1c faqs what are the terms on the free license polycom inc retrieved 2009 09 07 greg galitzine 2008 08 06 polycom cto discusses siren 7 hd voice codec tmcnet com retrieved 2014 07 19 external links edit polycom siren g 722 1 polycom siren g 722 1 faqs polycom siren 14 g 722 1c polycom siren 22 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 siren_ codec oldid 1368987389 category audio codecs hidden categories articles with short description short description is different from wikidata webarchive template archiveis links cs1 unfit url webarchive template wayback links this page was last edited on 12 august 2026 at 06 13 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 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