G.729 CODEC Description: G.729 Speech Compression Standard for Conjugate-Structure Algebraic Code Excited Linear Prediction (CS-ACELP), is a technology developed by CELP mode, which is 10ms 10ms, and each time There are 80 sample values. During each MS, the voice signal is analyzed, and the characteristic parameters are removed based on the CELP architecture, then encoded into 80 bits, and finally the original voice signal will be converted into a series of parameter values to the receiving end. , Achieved the purpose of speech compression. G.729 Voice compression standards are very wide, such as VoIP network gateways, IP phones, video conferences, and conferences. When ITU, the G.729 speech compression standard was first developed, in order to make it a low-order rate, high sound quality, but low complexity, it used considerable patented technology in G.729 algorithm, most of which patented All major primary telecom operators are held, including France Telecom, Universite de Sherbrooke, and Japanese telegraph telephone company (NTT). They organized the G.729 patent alliance in March 1998, and the representative of Sipro Lab Telecom as this alliance is responsible for processing various patent licensing issues. The industry must obtain relevant patent licensing permit in advance, and can legalize the use of ITU G.729 related products. About G
.729A
Description: 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
.729A
/ B Patent Policy: A total of 42 patents in G.729 is listed in ITU-T Pertabase (AS AT 02 June 2004). These 42 patents are published in ITU-T patent policy, and their contents are as follows: The Patent Holder Is Not Prepared to Wails His Rights But Would Be Willing to Negotiate Licenses with Other Parties On A Bob-Discriminator Basis on Reasonable Terms and conditions.such Negotias Are Left to the Parties Concerned and is Performed Outside The Itu-t. Indicates that these patents do not give up any of their powers, and any patented use must obtain the consent of the patentee. That is to say, before using ITU-T G.729, you must obtain the authorization of these related patent patents beforehand.
Download: 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/g0729e.zipg.729 Annex A - Reduced Complexity 8 Kbit / S cs-acelp Speech Codechtp://www.vsi.ru/ Library / ITU-T / Original / Recs / g / g0729nae.zipg.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/g0729nbe.zip
