Digital, frequency-translated, plural-channel, vestigial sideban

Details Digital, frequency-translated, plural-channel, vestigial sideban Digital, frequency-translated, plural-channel, vestigial sideban

1977-09-30

1980-01-08

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

325 9, 325 10, 325 11, 325 50, 343204, H04N 710, H04B 714, H04B 168, H04J 300

Patent

active

041830547

ABSTRACT:
A television communication system distributes plural VSB digitally encoded TV channels via an optical transmission link to one or more distribution terminals. At the headend the frequency band of each of the VSB signals is shifted down to baseband and transmitted in digital format. At each station along the network, the digitized baseband VSB television signal is converted into analog format and then reshifted through an up-converter to its original IF band so as to be compatible with the television receiver circuitry of the subscribers served by the distribution station. Advantageously, the present invention may employ optical communication techniques for coupling the digitally encoded frequency-shifted VSB television signals between stations. To maintain signal strength and quality, repeater units may be located in the optical communication link. Each repeater converts an incoming optical signal to an electrical signal for amplification and then reconverts the improved electrical signal back into optical form for further transmission along the link.

REFERENCES:
patent: 3665316 (1972-05-01), Jeffers
patent: 3715664 (1973-02-01), Ikrath
patent: 3824597 (1974-07-01), Berg
patent: 4002980 (1977-01-01), Herz
patent: 4004078 (1977-01-01), Gorog
patent: 4062043 (1977-12-01), Zeidler
patent: 4074127 (1978-02-01), Mochida

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