Television – Two-way video and voice communication – User positioning
Patent
1991-11-29
1994-11-15
Eisenzopf, Reinhard J.
Television
Two-way video and voice communication
User positioning
348 12, 455 51, 455 61, H04B 350, H04H 102
Patent
active
053652649
ABSTRACT:
A bi-directional video signal transmission system is equipped with transmission lines having coupled upsteam and downstream segments. With the entire band of a RF signal being taken as a modulation frequency band, an image signal modulated to a frequency band and RF-multiplexed in the upstream segment is introduced into the downstream segment at the modulated frequency and is then branched to demodulate the same frequency band, thereby obtain one video signal transmission channel. In response to a request by a subscriber, a channel management section assigns and releases the transmission channels and further outputs a control command whereby a transceiver control section performs switching-control of the transmission frequencies to transceiver units.
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patent: 4982430 (1991-01-01), Freeza et al.
patent: 5130793 (1992-07-01), Bordry et al.
Inoue Akino
Kanaya Etsumi
Misawa Motohiro
Yamaguchi Kazuaki
Eisenzopf Reinhard J.
Matsushita Electric - Industrial Co., Ltd.
Pham Chi
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