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Performance Improvement of Packet Loss Concealment Algorithm in G.711 Using Adaptive Signal Scale Estimation

적응적 신호 크기 예측을 이용한 G.711 패킷 손실 은닉 알고리즘의 성능향상

Tae-Ha Kim1
,
In-Sung Lee1*
김 태하1
,
이 인성1*
1Department of Radio Communication Eng Chungbuk National University
1충북대학교 전파통신공학과
*교신저자. *Corresponding Author. 
30 September 2015. pp. 403-409
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Abstract

In this paper, we propose Packet Loss Concealment (PLC) method using adaptive signal scale estimation for performance improvement of G.711 PLC. The conventional method controls a gain using 20 % attenuation factor when continuous loss occurs. However, this method lead to deterioration because that don't consider the change of signal. So, we propose gain control by adaptive signal scale estimation through before and after frame information using Least Mean Square (LMS) predictor. Performance evaluation of proposed algorithm is presented through Perceptual Evaluation of Speech Quality (PESQ) evaulation.

Keywords
PLC
LMS
Predictor
G.711
PESQ
Gain control

본 논문에서는 G.711 패킷 손실 은닉 알고리즘의 성능향상을 위해 적응적 신호 크기 예측을 사용하는 패킷 손실 알고리즘을 제안한다. 기존의 방법은 연속 손실이 발생하였을 때 20 %의 감쇠인자를 가지고 이득조절을 수행하였다. 그러나 이 방법은 신호의 변화를 고려하지 않기 때문에 신호가 왜곡되는 경우가 발생한다. 따라서 Least Mean Square(LMS) 예측기를 사용하여 이전과 이후 프레임의 정보를 통한 적응적 신호 크기 예측으로 이득을 조절하는 것을 제안한다. 제안된 알고리즘의 성능 평가는 Perceptual Evaluation of Speech Quality(PESQ) 평가를 통하여 나타내었다.

키워드
패킷 손실 은닉
LMS 예측기
G.711
PESQ
이득조절
References
1
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4.ITU-T Recommendation, Appendix I: A high quality low- complexity algorithm for packet loss concealment with G.711, 1999.
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 34
  • No :5
  • Pages :403-409
  • Received Date : 2015-06-15
  • Accepted Date : 2015-07-30
  • DOI :https://doi.org/10.7776/ASK.2015.34.5.403
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