The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
1995년에 G.8의 729kb/s CS-ACELP 코더가 ITU-T SG15에 의해 표준화되었으며 G.729의 음성 품질은 32kb/s ADPCM(G .726). 그러나 G.729는 고정 속도 음성 코더이며 상호 대화에서 음성 활동의 속성을 고려하지 않습니다. 음성 활동을 사용하면 음성 품질 저하 없이 평균 비트 전송률을 절반으로 줄일 수 있습니다. 본 논문에서는 G.729를 위한 효율적인 가변율 알고리즘을 제안한다. 가변율 알고리즘은 요율 결정 알고리즘과 하위 요율 코더 설계라는 두 가지 주요 주제로 구성됩니다. 강력한 VAD 알고리즘을 위해 에너지 임계화 방법, 분석 과정을 통해 얻은 다양한 특징 매개변수를 통합한 음성 분할 방법, 가변 숙취 기간 방법을 결합합니다. 잡음 특성 분석을 통해 배경 잡음 신호를 코딩하기 위한 1kb/s 하위 속도 코더를 설계했습니다. 또한 무성음 부분에 대해서는 4kb/s 서브 레이트 코더를 설계합니다. 가변율 알고리즘의 성능은 음성 품질과 평균 비트율을 G.729와 비교하여 평가합니다. 주관적인 품질 테스트도 MOS 테스트로 진행됩니다. 결과적으로 제안된 가변율 CS-ACELP 코더는 평균 비트율 729kb/s에서 G.4.4와 동일한 음성 품질을 제공하는 것을 확인하였다.
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Woosung CHUNG, Sangwon KANG, "Design of a Variable Rate Algorithm for the CS-ACELP Coder" in IEICE TRANSACTIONS on Information,
vol. E82-D, no. 10, pp. 1364-1371, October 1999, doi: .
Abstract: In 1995, 8 kb/s CS-ACELP coder of G.729 is standardized by ITU-T SG15 and it has been reported that the speech quality of G.729 is better than or equal to that of 32 kb/s ADPCM (G.726). However G.729 is the fixed rate speech coder, and it does not consider the property of voice activity in mutual conversation. If we use the voice activity, we can reduce the average bit rate in half without any degradations of the speech quality. In this paper, we propose an efficient variable rate algorithm for G.729. The variable rate algorithm consists of two main subjects, the rate determination algorithm and the design of sub rate coders. For the robust VAD algorithm, we combine the energy-thresholding method, the phonetic segmentation method by integration of various feature parameters obtained through the analysis procedure, and the variable hangover period method. Through the analysis of noise features, the 1 kb/s sub rate coder is designed for coding the background noise signal. Also, we design the 4 kb/s sub rate coder for the unvoiced parts. The performance of the variable rate algorithm is evaluated by the comparison of speech quality and average bit rate with G.729. Subjective quality test is also done by MOS test. Conclusively, it is verified that the proposed variable rate CS-ACELP coder produces the same speech quality as G.729, at the average bit rate of 4.4 kb/s.
URL: https://global.ieice.org/en_transactions/information/10.1587/e82-d_10_1364/_p
부
@ARTICLE{e82-d_10_1364,
author={Woosung CHUNG, Sangwon KANG, },
journal={IEICE TRANSACTIONS on Information},
title={Design of a Variable Rate Algorithm for the CS-ACELP Coder},
year={1999},
volume={E82-D},
number={10},
pages={1364-1371},
abstract={In 1995, 8 kb/s CS-ACELP coder of G.729 is standardized by ITU-T SG15 and it has been reported that the speech quality of G.729 is better than or equal to that of 32 kb/s ADPCM (G.726). However G.729 is the fixed rate speech coder, and it does not consider the property of voice activity in mutual conversation. If we use the voice activity, we can reduce the average bit rate in half without any degradations of the speech quality. In this paper, we propose an efficient variable rate algorithm for G.729. The variable rate algorithm consists of two main subjects, the rate determination algorithm and the design of sub rate coders. For the robust VAD algorithm, we combine the energy-thresholding method, the phonetic segmentation method by integration of various feature parameters obtained through the analysis procedure, and the variable hangover period method. Through the analysis of noise features, the 1 kb/s sub rate coder is designed for coding the background noise signal. Also, we design the 4 kb/s sub rate coder for the unvoiced parts. The performance of the variable rate algorithm is evaluated by the comparison of speech quality and average bit rate with G.729. Subjective quality test is also done by MOS test. Conclusively, it is verified that the proposed variable rate CS-ACELP coder produces the same speech quality as G.729, at the average bit rate of 4.4 kb/s.},
keywords={},
doi={},
ISSN={},
month={October},}
부
TY - JOUR
TI - Design of a Variable Rate Algorithm for the CS-ACELP Coder
T2 - IEICE TRANSACTIONS on Information
SP - 1364
EP - 1371
AU - Woosung CHUNG
AU - Sangwon KANG
PY - 1999
DO -
JO - IEICE TRANSACTIONS on Information
SN -
VL - E82-D
IS - 10
JA - IEICE TRANSACTIONS on Information
Y1 - October 1999
AB - In 1995, 8 kb/s CS-ACELP coder of G.729 is standardized by ITU-T SG15 and it has been reported that the speech quality of G.729 is better than or equal to that of 32 kb/s ADPCM (G.726). However G.729 is the fixed rate speech coder, and it does not consider the property of voice activity in mutual conversation. If we use the voice activity, we can reduce the average bit rate in half without any degradations of the speech quality. In this paper, we propose an efficient variable rate algorithm for G.729. The variable rate algorithm consists of two main subjects, the rate determination algorithm and the design of sub rate coders. For the robust VAD algorithm, we combine the energy-thresholding method, the phonetic segmentation method by integration of various feature parameters obtained through the analysis procedure, and the variable hangover period method. Through the analysis of noise features, the 1 kb/s sub rate coder is designed for coding the background noise signal. Also, we design the 4 kb/s sub rate coder for the unvoiced parts. The performance of the variable rate algorithm is evaluated by the comparison of speech quality and average bit rate with G.729. Subjective quality test is also done by MOS test. Conclusively, it is verified that the proposed variable rate CS-ACELP coder produces the same speech quality as G.729, at the average bit rate of 4.4 kb/s.
ER -