MALSORI (대한음성학회지:말소리)
- Issue 57
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- Pages.175-189
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- 2006
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- 1226-1173(pISSN)
Performance Improvement of Packet Loss Concealment Algorithm in G.711 Using Speech Characteristics
음성 특성을 이용한 G.711 패킷 손실 은닉 알고리즘의 성능개선
- Han Seung-Ho (ICU) ;
- Kim Jin-Sul (ETRI) ;
-
Lee Hyun-Woo
(ETRI) ;
-
Ryu Won
(ETRI) ;
-
Hahn Min-Soo
(ICU)
- 한승호 (한국정보통신대학교 음성/음향 정보연구실) ;
- 김진술 (한국전자통신연구원 광대역통합망연구단 BcN 연동기술팀) ;
-
이현우
(한국전자통신연구원 광대역통합망연구단 BcN 연동기술팀) ;
-
류원
(한국전자통신연구원 광대역통합망연구단 BcN 연동기술팀) ;
-
한민수
(한국정보통신대학교 음성/음향 정보연구실)
- Published : 2006.03.01
Abstract
Because a packet loss brings about degradation of speech quality, VoIP speech coders have PLC (Packet Loss Concealment) mechanism. G.711, which is a mandatory VoIP speech coder, also has the PLC algorithm based on pitch period replication. However, it is not robust to burst losses. Thus, we propose two methods to improve the performance of the original PLC algorithm in G.711. One adaptively utilizes voiced/unvoiced information of adjacent good frames regarding to the current lost frame. The other is based on adaptive gain control according to energy variation across the frames. We evaluate the performance of the proposed PLC algorithm by measuring a PESQ value under different random and burst packet loss simulating conditions. It is shown from the experiments that the performance of the proposed PLC algorithm outperforms that of PLC employed in ITU-T Recommendation G.711.