MULTICAST VIDEO CONFERENCE TERMINAL, VIDEO CONFERENCE SYSTEM AND ITS CONTROLLING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a video conference terminal in which collision of voices can be avoided even when multicast is used. SOLUTION: A voice signal 100 is digitized at a video input section 1 and encoded at a video encoding section 2 before being transmitted as encoded voice data 103. A vocal information processing section 3 transmits vocal information 113 based on voice level data 102 from the voice input section 1, lip motion information 107 from a lip motion discriminating section 7, and right of speaking information 112 from a right of speaking token processing section 13. Encoded video data 116 from other terminal is delivered to a speaker through a voice decoding section 8, a mixer section 9 and an output section 10. The mixer section 9 synthesizes only voice data transmitted from a terminal designated by vocal information 115 from a vocal information receiving section 14 selectively.