Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-10-13
1985-05-14
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
455187, 455195, H04N 716, H04K 100
Patent
active
045175950
ABSTRACT:
In a pay television channel selector, a reception contract selecting portion comprises parallel circuits which are disposed in correspondence with channels and whose impedances are made different between the contracted and uncontracted channels, and a control circuit device whose output level changes depending upon the impedances of the parallel circuits, so that the scrambled broadcast of the contracted channel is descrambled on the basis of the output control signal of the control circuit device. The tapping of the uncontracted channel ascribable to the imperfection of a double lock preventive mechanism of multi-throw switches used as channel selecting switches can be prevented.
REFERENCES:
patent: 3760097 (1973-09-01), Burroughs
patent: 3801915 (1974-04-01), Ostuni et al.
patent: 4197503 (1980-04-01), Dini
patent: 4232396 (1980-11-01), Grimes
Alps Electric Co. ,Ltd.
Buczinski S. C.
Dunne Gerard F.
Shoup Guy W.
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