72:(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. The algorithm is based on
118:. 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.
137:, 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) . The libsiren library has also been copied into libmsn and into the msn-pecan project, which provides plug-in for
65:
recommendation, which is based on Siren 7 algorithm. It was approved after a four-year selection process involving extensive testing. G.722.1 provides only bit rates 24 and 32 kbit/s and does not support Siren 7's bit rate 16 kbit/s. The algorithm of Siren 7 is identical to its successor,
94:(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
195:
244:
114:
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
125:. 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.
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communication open source software can do transcoding, conferencing and bridging of Siren 7/G.722.1 and Siren 14/G.722.1C audio formats.
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Usage of Siren 7 and Siren 14 audio coding formats require the licensing of patents from
Polycom, in most countries. A
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719:"Libmsn - is a reusable, open-source, fully documented library for connecting to Microsoft's MSN Messenger service"
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full-band codec which is based on
Polycom Siren 22 audio technology and Ericsson's advanced audio techniques.
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licence for Siren 7 and Siren 14 is available from
Polycom if certain fairly basic conditions are met.
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Cosine-/Sine-Modulated Filter Banks: General
Properties, Fast Algorithms and Integer Approximations
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Beyond VoIP Protocols: Understanding Voice
Technology and Networking Techniques for IP Telephony
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In
Windows XP and later versions of Windows, the Siren 7 codec is implemented in
2003:
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Polycom
Enables Acceleration of HD Voice Adoption by Offering Royalty-Free Codec
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38:, Inc. in 2001). There are three Siren codecs: Siren 7, Siren 14 and Siren 22.
20:
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16 kHz. Siren is derived from
PictureTel's PT716plus algorithm. In 1999,
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196:"PictureTel Announces New Siren Wideband Audio Technology Licensing Program"
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835:"Polycom Siren 14/G 722.1C FAQs - What are the terms on the free license?"
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563:"Media Support in the Microsoft Windows Real-Time Communications Platform"
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Siren 7 is commonly used in videoconferencing systems and is also part of
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Usage of Siren 22 also requires the licensing of patents from
Polycom.
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368:"ITU Approves Polycom Siren14 as New International Standard"
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Hersent, Olivier; Petit, Jean-Pierre; Gurle, David (2005).
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G.722.1, although the data formats are slightly different.
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ITU Approves Polycom Siren14 as New International Standard
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677:"msn-pecan 0.0.18 released, now with voice clips support"
49:(or Siren7 or simply Siren) provides 7 kHz audio,
584:"FreeSWITCH First to Support Polycom's 32khz HD-Audio"
848:
496:"G.719: The First ITU-T Standard for Full-Band Audio"
245:"PictureTel Licenses Audio Technology Suite to Intel"
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857:"Polycom CTO Discusses Siren 7 HD Voice Codec"
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390:Siren 14 information for Prospective Licensees
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666:, Pidgin.im mailinglist, Retrieved 2009-09-08
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30:implementations developed and licensed by
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742:. Libmsn project at Sourceforge.net. 2009
721:. Libmsn project at Sourceforge.net. 2009
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586:. FreeSWITCH. 2008-12-15. Archived from
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740:"SCM Repositories - libmsn - libsiren"
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112:Microsoft Office Communications Server
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764:. Xiph.Org Foundation. Archived from
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326:
541:"MPlayer - Status of codecs support"
247:. thefreelibrary.com. Archived from
198:. thefreelibrary.com. Archived from
813:"Siren7/Siren14/G.719 License info"
101:
13:
2714:Comparison of audio coding formats
788:"Speex - Codec Quality Comparison"
170:Comparison of audio coding formats
123:%systemroot%\system32\SIRENACM.DLL
86:modified discrete cosine transform
14:
2771:
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762:"CELT - Codec Feature Comparison"
436:
2276:ISO/IEC base media file format
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370:. BusinessWire.com. 2005-04-12
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1:
855:Greg Galitzine (2008-08-06).
180:
110:when using A/V conferencing.
108:Microsoft Office Communicator
786:Xiph.Org Foundation (2006).
760:Xiph.Org Foundation (2009).
313:"Polycom Siren/G 722.1 FAQs"
243:Business Wire (2000-07-19).
194:Business Wire (2001-03-26).
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7:
561:Microsoft (November 2001).
347:"Polycom Siren 14/G 722.1C"
332:Polycom, Inc. (2005-04-12)
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145:instant messaging clients.
53:16, 24, 32 kbit/s and
41:
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2719:Comparison of video codecs
1229:(GB/T 33475.2,GY/T 299.1)
886:Polycom Siren/G 722.1 FAQs
657:MSN Protocol documentation
501:. Polycom, Inc. April 2009
78:modulated lapped transform
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453:. Springer. p. 478.
82:discrete cosine transform
2543:Alliance for Open Media
679:. msn-pecan. 2009-02-16
1463:MPEG-1 Layer III (MP3)
655:KaKaRoTo (2008-02-12)
336:, Retrieved 2009-09-07
299:, Retrieved 2009-09-07
32:PictureTel Corporation
2481:QuickTime File Format
881:Polycom Siren/G 722.1
790:. Xiph.Org Foundation
612:"libg722_1 - COPYING"
420:John Wiley & Sons
2740:Compression software
2297:MPEG media transport
1374:Sorenson Video/Spark
633:"libg722_1 - README"
443:Britanak, Vladimir;
76:technology, using a
24:audio coding formats
2738:for techniques and
2736:Compression methods
1232:HDR Vivid(GY/T 358)
662:2013-05-24 at the
475:"Polycom Siren 22"
274:has generic name (
225:has generic name (
55:sampling frequency
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2439:DivX Media Format
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1237:AVS3 P2(GY/T 368)
1223:(GB/T 20090.2/16)
80:(MLT), a type of
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2513:VOB, IFO and BUP
2287:Motion JPEG 2000
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1984:aptX Low Latency
1761:Chinese Standard
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1214:Chinese Standard
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1770:(GB/T 20090.10)
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2724:List of codecs
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2292:MPEG-21 Part 9
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1064:Part 2 / LCEVC
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875:External links
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833:Polycom, Inc.
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288:(2008-08-05)
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272:|author=
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251:on 2012-10-13
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34:(acquired by
33:
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18:
2760:Audio codecs
1920:
1790:(GB/T 22726)
1451:Multichannel
1307:MSU Lossless
1221:AVS1 P2/AVS+
1175:TrueMotion S
1113:H.265 / HEVC
1059:Part 1 / EVC
1047:Part 3 / VVC
1013:Part 2 / ASP
861:. Retrieved
859:. TMCnet.com
850:
839:. Retrieved
828:
817:. Retrieved
792:. Retrieved
781:
770:. Retrieved
766:the original
755:
744:. Retrieved
734:
723:. Retrieved
713:
702:. Retrieved
692:
681:. Retrieved
671:
637:. Retrieved
635:. FreeSWITCH
627:
616:. Retrieved
614:. FreeSWITCH
592:. Retrieved
588:the original
578:
567:. Retrieved
556:
545:. Retrieved
535:
524:. Retrieved
514:
503:. Retrieved
490:
479:. Retrieved
469:
449:
438:
414:
407:
397:, retrieved
389:
383:
372:. Retrieved
362:
351:. Retrieved
341:
328:
317:. Retrieved
284:
253:. Retrieved
249:the original
204:. Retrieved
200:the original
189:
159:
155:royalty free
152:
133:
127:
120:
105:
91:
90:
69:
68:
46:
45:
16:
15:
2508:MOD and TOD
2449:Flash Video
2387:3GP and 3G2
2068:HEIC / HEIF
2020:compression
1780:Audio Vivid
1515:MPEG-D USAC
1510:MPEG-4 CELP
1505:MPEG-4 HVXC
1420:compression
1252:Apple Video
1168:and AOMedia
1118:H.266 / VVC
1108:H.264 / AVC
950:compression
935:compression
700:. msn-pecan
698:"msn-pecan"
565:. Microsoft
28:audio codec
2742:for codecs
2689:Daubechies
2664:Transforms
2566:Arithmetic
2233:Containers
1938:True Audio
1782:(GY/T 363)
1500:MPEG-4 DST
1495:MPEG-4 SLS
1490:MPEG-4 ALS
1364:SheerVideo
1338:QuickTime
1166:TrueMotion
932:Multimedia
863:2014-07-19
841:2009-09-07
819:2009-09-07
794:2009-09-07
772:2009-09-07
746:2009-09-07
725:2009-09-07
704:2009-09-07
683:2014-07-19
639:2014-07-19
618:2014-07-19
594:2009-09-07
569:2009-09-07
547:2009-09-07
526:2009-09-07
505:2009-09-07
481:2009-09-07
445:Rao, K. R.
399:2010-06-08
374:2009-09-10
353:2009-09-07
319:2009-09-07
255:2009-09-10
206:2009-09-10
181:References
129:FreeSWITCH
26:and their
2491:RealMedia
2093:JPEG 2000
1896:RealAudio
1876:OptimFROG
1354:RealVideo
1342:Animation
1312:OMS Video
939:container
149:Licensing
84:(DCT) or
61:approved
51:bit rates
2754:Category
2610:Lossless
2576:Modified
2469:Matroska
2348:Matroska
2259:MPEG-PES
1871:Musepack
1768:AVS1 P10
1347:Graphics
1297:Lagarith
660:Archived
447:(2017).
293:Archived
264:cite web
215:cite web
164:See also
92:Siren 22
88:(MDCT).
70:Siren 14
42:Editions
21:wideband
2684:Wavelet
2625:DEFLATE
2571:Huffman
2561:Entropy
2553:Methods
2538:MPEG LA
2427:Smacker
2315:H.222.0
2271:MPEG-TS
2266:MPEG-PS
2254:MPEG-ES
2138:TIFF/IT
2133:TIFF/EP
2118:JPEG XT
2113:JPEG XS
2108:JPEG XR
2103:JPEG XL
2098:JPEG-LS
1979:aptX HD
1959:WavPack
1901:RTAudio
1841:Codec 2
1774:AVS2 P3
1701:GSM-EFR
1671:AMR-WB+
1605:G.729.1
1585:G.723.1
1575:G.722.2
1570:G.722.1
1369:Smacker
1359:RTVideo
1287:Huffyuv
1267:Cinepak
1227:AVS2 P2
941:formats
520:"Siren"
175:G.722.1
116:RTAudio
63:G.722.1
47:Siren 7
36:Polycom
2486:RatDVD
2380:Others
2147:Others
1949:VMR-WB
1944:TwinVQ
1809:Others
1696:GSM-FR
1691:GSM-HR
1681:EVRC-B
1666:AMR-WB
1638:Vorbis
1478:AAC-LD
1473:HE-AAC
1379:Theora
1322:ProRes
1317:Pixlet
1245:Others
1054:MPEG-5
1042:MPEG-I
1030:MPEG-H
1008:MPEG-4
1001:Part 2
996:MPEG-2
991:MPEG-1
457:
426:
139:Pidgin
2707:Lists
2652:ADPCM
2647:µ-law
2642:A-law
2615:Lossy
2588:ACELP
2533:NETVC
2358:SMPTE
2320:T.802
2307:ITU-T
2283:(MP4)
2083:JBIG2
2046:ITU-T
2018:Image
1954:VSELP
1931:SVOPC
1921:Siren
1891:RCELP
1886:QCELP
1831:ATRAC
1816:ACELP
1633:Speex
1600:G.729
1595:G.728
1590:G.726
1580:G.723
1565:G.722
1560:G.719
1555:G.718
1548:µ-law
1543:A-law
1538:G.711
1530:ITU-T
1418:Audio
1292:Indeo
1272:Daala
1128:SMPTE
1103:H.263
1098:H.262
1093:H.261
1088:H.120
1076:ITU-T
981:MJPEG
948:Video
499:(PDF)
394:(PDF)
143:Adium
96:G.719
59:ITU-T
17:Siren
2734:See
2679:MDCT
2657:DPCM
2603:WLPC
2593:CELP
2496:RIFF
2474:WebM
2464:M2TS
2454:HEIF
2422:Bink
2402:AIFF
2330:IETF
2219:WebP
2214:WBMP
2209:QTVR
2189:ICER
2184:FLIF
2174:DjVu
2164:AVIF
2154:APNG
2128:TIFF
2088:JPEG
2078:JBIG
2073:HEVC
2050:JPEG
2037:IETF
2004:LLAC
1999:LHDC
1994:LDAC
1974:aptX
1935:TTA
1916:SILK
1856:MELP
1851:Lyra
1846:iSAC
1836:CELT
1826:Asao
1821:ALAC
1799:ExAC
1794:L2HC
1724:AC-4
1719:AC-3
1711:ETSI
1676:EVRC
1653:3GPP
1643:FLAC
1628:iLBC
1623:Opus
1615:IETF
1438:MPEG
1404:YULS
1384:Thor
1332:4444
1282:FFV1
1262:Bink
1156:VC-6
1151:VC-5
1146:VC-3
1141:VC-2
1136:VC-1
1080:VCEG
968:MPEG
937:and
455:ISBN
424:ISBN
276:help
227:help
141:and
135:aMSN
2694:DWT
2674:FFT
2669:DCT
2637:PCM
2630:LZW
2598:LSP
2583:LPC
2501:WAV
2459:IFF
2444:EVO
2434:BMP
2417:BPG
2407:AVI
2397:ASF
2392:AMV
2371:MXF
2366:GXF
2343:Ogg
2338:RTP
2246:IEC
2242:ISO
2204:QOI
2199:PGF
2194:MNG
2179:EXR
2169:BPG
2159:AV1
2123:PNG
2063:GIF
2042:W3C
2033:ISO
2029:IEC
1969:MQA
1964:WMA
1926:SMV
1911:SHN
1906:SD2
1881:OSQ
1866:MT9
1788:DRA
1752:LC3
1747:SBC
1729:DTS
1686:EVS
1661:AMR
1468:AAC
1433:IEC
1429:ISO
1399:XEB
1394:WMV
1327:422
1277:DVI
1257:AVS
1205:AV1
1200:VP9
1195:VP8
1190:VP7
1185:VP6
1180:VP3
963:IEC
959:ISO
2756::
2620:LZ
2412:AU
2244:,
2048:,
2044:,
2039:,
2035:,
2031:,
1431:,
1389:Ut
1078:,
976:DV
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262:{{
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213:{{
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463:.
432:.
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356:.
322:.
278:)
258:.
229:)
209:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.