G.729 CODEC
G.729 CODEC
??介:
G.729?Z音?嚎s?????? Conjugate-Structure Algebraic Code Excited Linear Prediction (CS-ACELP) ,是基於CELP模式所?l展出?淼募夹g,其所使用的?Z音?r框??10mS,而每一?r框有80??取?又怠T诿??mS的?r?g?龋??Z音??????被分析,?K基於CELP的架??,取出其特性???担?然後???a成80??位元,最後原本的?Z音??????被?D?Q成一?B串的???抵??魉偷浇邮斩耍??_到了?Z音?嚎s的目的。
G.729 ?Z音?嚎s???实???用非常?V泛,如VoIP?W路?l道、IP????、???????h和???????h等。ITU??初制定G.729?Z音?嚎s?????r,?榱耸蛊渚哂械臀辉?率、高音?|、?s又低?}?s度的特性,在G.729演算法中?用了相??多的?@?技?g,其中大部分的?@??????H各大主要??信?I者所持有,?@些公司包括法????信(France Telecom)、Universite de Sherbrooke及日本???箅???公司(NTT)。他??逾1998年3月?M??了G.729?@???盟,?K委由Sipro Lab Telecom公司作?榇寺?盟的代表,??????理各?@?授?????}。?I者必??事先?@得相?P?@?授?嘣S可,方能合法使用生?aITU G.729相?P?a品。
?P於G
Codeec Algorithm : Conjugate-Structure Algebraic Code Excited Linear Prediction (CS-ACELP)
Frame size : 10mS(80 samples)
Sampling rate : 8kHz, 16 bit linear PCM
Bit Rate : 8kbps (80 bits per frame)
Speech Quality : equivalent to G.726 at 32kbps
Algorithmic delay : 15mS(10mS + 5mS look-ahead)
G
根??ITU-T Partent Statement and Licensing Declaration Database (as at 02 June 2004)中所列示有?PG.729的?@?件?倒灿?42件。?@42件?@?皆?l表ITU-T?@?政策中的第2.2????明,其?热萑缦拢?
The patent holder is not prepared to waive his rights but would be willing to negotiate licenses with other parties on a bob-discriminatory basis on reasonable terms and conditions.Such negotiations are left to the parties concerned and are performed outside the ITU-T.
表示?@些?@?的?@??嗳??K未放??任何他??的?嗔Γ?任何?@?的使用必???@得?@??嗳说耐?意。也就是?f,在使用ITU-T G.729的???手?前,你必??事先取得?@些相?P?@?之?@?人的授?唷?
下载:
G.729 - Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear-prediction
http://www.vsi.ru/library/ITU-T/original/recs/g/g0729e.zip
G.729 Annex A - Reduced complexity 8 kbit/s CS-ACELP speech codec
http://www.vsi.ru/library/ITU-T/original/recs/g/g0729nae.zip
G.729 Annex B - A silence compression scheme for G.729 optimized for terminals conforming to Recommendation V.70
http://www.vsi.ru/library/ITU-T/original/recs/g/g0729nbe.zip










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