An adaptive receiver buffer adjust algorithm for VoIP applications considering voice characters

A new adaptive receiver buffer adjust algorithm is proposed for VoIP applications with the consideration of voice characters and network conditions. It divides network status into two modes: normal mode and spike mode, according to the delay of the coming packets and the size of buffer. In normal mode, the receiver adjusts the buffer delay at the beginning of every talk-spurt according to the delay jitters collected during the last talk-spurt. In spike mode, two buffer adjust methods are proposed. One is to adjust the buffer delay for every packet based on a prediction of the delay according to the delay of former packets; the other is to adjust the buffer delay based on a prearranged way. Simulations and experiments show that this strategy can well conceal the delay jitter and reduce the packet loss rate.