Television – Two-way video and voice communication – User positioning
Patent
1994-09-02
1997-04-01
Peng, John K.
Television
Two-way video and voice communication
User positioning
348 13, 455 51, H04N 710, H04N 714
Patent
active
056171358
ABSTRACT:
A multi-point visual communication system which includes an adaptive filter part for controlling a spatial frequency characteristic of a video signal, a filter selector for selecting a video quality to be transmitted from its own site on the basis of integrated requests received from sites, and a filter control for adaptively controlling a filter characteristic taking both of a video information quantity and situations of a telecommunication network into consideration, and wherein a video signal processed by the adaptive filter part is subjected to an encoding operation and then transmitted to the telecommunication network. Thereby, the video quality can be selected according to users' requests, and the video quality of the multi-point visual communication can be improved without incurring an excessive increase of a video information quantity. Further, through the video signal processing taking both the video characteristic and the telecommunication network situations into consideration, a comparatively high quality of video transmission can be realized when viewed from an information quantity.
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Proceeding D-228 of the Autumn General Meeting of the Institute of Electronics.
William J. Clark, Multipoint Multimedia Conferencing, IEEE Communications Magazine, pp. 44-50 May 1992.
Kinoshita Taizo
Noda Fumio
Shibata Koichi
Flynn Nathan J.
Hitachi , Ltd.
Peng John K.
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