Audio Compression and Echo Cancellation for Low Bit Rate VideoTeleconferencing

Abstract

The constraints for audio compression and echo cancellation in low bit rate videoteleconferencing (56 to 128 thousand bits per second) difeer in many important respects from audio-only teleconferencing. Algorithms which have been optimized for audio-only communications may be improved significantly or require significant improvement. In this talk, audio requirements will be presented, and we shall demonstrate with a tape how PictureTel has addressed these problems in their latest commercial product. A summary of the talk follows.