A Multimedia CELP/Subband Coder for ATM Networks
Robert E. Van Dyck, Jignasa N. Patel, E. Simotas, Q. Lin · 2005
The transmission of compressed audio and video data over ATM packet networks is quickly becoming a practical way to implement a multimedia teleconferencing system. To reduce the required bit rate of the combined audio/video sequence to that of basic rate ISDN, we encode the video using a subband coder and encode the audio using a CELP coder. In this paper, we examine the effects that packet losses, and the variable delay and delay jitter of ATM networks have on our audio coding system. Results for a large time-bandwidth product network are presented. Specifically, ways to make the speech coding more robust to packet loss are examined.