Multipoint video teleconferencing apparatus for processing and c

Details Multipoint video teleconferencing apparatus for processing and c Multipoint video teleconferencing apparatus for processing and c

1995-02-24

1998-09-22

Harvey, David E.

Television

Two-way video and voice communication

User positioning

348 15, H04N 715

Patent

active

058121854

ABSTRACT:
In a video teleconferencing system, line interfaces are connected to communication channels for receiving data-compressed integrated frame format signals from a video teleconferencing apparatus. Each of the integrated frame format signals contains the respective video frames of user terminals. Data decompression decoders are respectively connected to the interfaces for decompressing the data-compressed integrated frame format signals to produce data-decompressed integrated frame format signals. A controller, connected to the interfaces, receives control signals from the channels and produces an address signal. Extraction circuits are respectively connected to the decoders for extracting desired video frames from each of the data-decompressed integrated frame format signals in accordance with the address signal. The output signals of the extraction circuits are integrated by a video integrator and data-compressed by an encoder for transmission via the interface.

REFERENCES:
patent: 5408261 (1995-04-01), Kamata et al.
Sabri et al., "Video Conferencing Systems," Proceedings of the IEEE, vol. 73, No. 4, Apr., 1985, New York, pp. 671-688.
Tanigawa et al., "Personal Mulitmedia-Multipoint Teleconference System," IEEE Infocom'91-Proceedings vol. 3, Apr. 7-11, 1991, Bal Harbor, Florida, pp. 1127-1144.
Addeo et al., "A Multi-Media Multi-Point Communication Services Capability for Broadband Networks," International Switching Symposium 1987--Innovations in Switching Technology, Mar. 15-20, 1987, Phoenix, Arizona, pp. 423-428.
Kundig et al., "An Experimental Multimedia Communication System," ICC'93 Geneva--Conference Record, May 23-26, 1993, Geneva, pp. 838-842.

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