Catv system in which chanel selection signal is transmitted from

Television – Two-way video and voice communication – User positioning

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348 13, 455 42, H04N 7173, H04N 714

Patent

active

057292817

ABSTRACT:
A center station 1 generates an all-channel signal 2 obtained by multiplexing signals on all channels, and transmits the signals to a selective distribution station 10 through 1 wire transmission line such as an optical fiber. Subscribers' transmitting devices 40.sub.1 to 40.sub.N transmit requests for channels to be received by corresponding subscribers' receiving devices 30.sub.1 to 30.sub.N to the selective distribution station 10 in a radio transmission system. The selective distribution station 10 selects the signals on the channels requested from the all-channel signal 2 in response to requests to receive channels serving as up-signals transmitted in a radio transmission system from the subscribers' transmitting devices 40.sub.1 to 40.sub.N, and distributes and transmits the selected signals to the subscribers' receiving devices 30.sub.1 to 30.sub.N as down-signals.

REFERENCES:
patent: 4994909 (1991-02-01), Graves et al.
patent: 5421030 (1995-05-01), Baran
patent: 5448555 (1995-09-01), Bremer et al.
patent: 5481757 (1996-01-01), Mihara et al.
39th Annual Convention and Exposition of the National Cable Television Association, May 21-23, 1990, "HDTV MUSE Signals on Cables and Optical Fibers", pp. 160-168, Yozo Utsumi et al.

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