Improvement of Packet Loss Concealment Algorithm by Using state gain control and fixed codebook estimation

상태별 이득 제어 및 fixed codebook estimation을 이용한 G.729에서의 Packet Loss Concealment 알고리즘 개선

In real time packetized voice applications, missing frames is a major source of voice quality degradation. Thus packet loss concealment(PLC) algorithms are needed to guarantee the QoS of the VoIP. Still current speech codecs for VoIP work poor when consecutive packet losses are issued. In this paper, we proposed a new PLC algorithm for the G.729 codec. Our algorithm works better especially when the consecutive packet loss occurs mainly because it adopts an adaptive gain controller utilizing the number of missing packet information combined with a fixed codebook vector estimation algorithm and LPC bandwidth expansion.