Adaptively controlled multipoint videoconferencing system

Details Adaptively controlled multipoint videoconferencing system Adaptively controlled multipoint videoconferencing system

1993-07-09

1997-11-04

Woo, Stella

Television

Two-way video and voice communication

User positioning

348 17, 379202, 370260, H04N 715

Patent

active

056845278

ABSTRACT:
In a multipoint videoconferencing system including a plurality of visual telephone terminals and a multipoint control unit (MCU) connected thereto, shares of the respective visual telephone terminals are determined in the MCU, based on determination of a speaker determined from voice levels and/or amount of movement in the respective visual telephone terminals. The respective telephone terminals generate pictures at picture rates defined by the respective shares, and generate video data from the pictures at data rates defined by the respective shares. Video data generated in each visual telephone terminal are multiplexed in time division multiplexer in the MCU, and are distributed to the other terminals.

REFERENCES:
patent: 4449238 (1984-05-01), Lee et al.
patent: 4494144 (1985-01-01), Brown
patent: 4965819 (1990-10-01), Kannes
patent: 5003532 (1991-03-01), Ashida et al.
Mounts, F.W., "A Video Encoding System With Conditional Picture-Element Replenishment," The Bell System Technical Journal, vol. 48, No. 7, Sep. 1969, pp. 2545-2554.

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