75896417
Jan 7, 2000
Oct 28, 2003
teleconferencing systems; audio teleconferencing systems providing improved system operations through the use of an acoustic model of the teleconferencing space to cancel echoes; teleconferencing interfaces; audio/video teleconferencing interfaces; teleconferencing interfaces specifically designed for integration into higher level audio and video teleconferencing systems; audio and video links between two or more sites for providing an audio interface in audio systems
Electrical and Scientific Apparatus