MULTIPOINT TELECONFERENCE SYSTEM PROVIDING HIGH-QUALITY SPEECH.

This paper outlines a multimedia multipoint teleconference system providing high-quality speech at 64 kbit/s on digital leased circuits. It also proposed three new techniques for the system. The first is a multipoint control procedure based on CCITT Draft Recommendation G. 72y. The second is a voice summing technique suitable for different voice bandwidths and different speech coding algorithms. The third is a sound image localization control technique which makes it easier to spatially recognize individual speakers at multiple conference sites.