Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-05-06
1988-08-23
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
340715, H04N 1704
Patent
active
047664932
ABSTRACT:
A device for verifying the operational conditions of a monitor, to distinguish between a computer malfunction and a monitor malfunction by separating the signal cable of the monitor from the computer in the event that the computer system gets out of order. The horizontal synchronizing signal input terminal is connected to the base of a transistor, the collector of which is connected to the base of a switching transistor through a rectifying diode and smoothing condenser, the collector of the switching transistor is connected to a power supply terminal and to the base of an amplifying transistor for amplification of the video signals, so that when the horizontal synchronizing signals are input, the switching transistor is in an on-state so as not to affect the amplifying transistor, while in the case where horizontal synchronizing signals are not input, the switching transistor is turned off so that a power source at the power supply terminal turns on the amplifying transistor to test the operation of the display tube.
REFERENCES:
patent: 3548403 (1970-12-01), Johnson
patent: 4536792 (1985-08-01), Harshbarger
patent: 4568975 (1986-02-01), Harshbarger
patent: 4703319 (1987-10-01), Schine
Britton Howard W.
Gold Star Co. Ltd.
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