Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-08-21
1988-09-13
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
455180, 455191, H04N 5455, H04B 118
Patent
active
047713321
ABSTRACT:
A channel selection circuit selects signals of a desired frequency from television signals. A channel interpretation circuit determines whether or not the signals thus selected are low-band or high-band. When the signals are low-band, a movable contact is coupled to a D.C. power source. When the signals are high-band, the movable contact is coupled to the ground. A first trap circuit traps the intermediate-frequency components of the selected signals. A second trap circuit connected to the first trap circuit, and a third trap circuit coupled between the output of the second trap circuit and the group and also connected to the movable contact of a switch section, cooperate, thereby trapping predetermined signals. More specifically, when the movable contact is coupled to the D.C. power source, a semiconductor switching device is turned on, thus causing the second and third trap circuits to trap high-band signals and intermediate-frequency signals. When the movable contact is coupled to the ground, the switching device is turned off, thereby causing to the second and third trap circuits to perform the image-trapping of high-band signals and to trap low-band signals.
REFERENCES:
patent: 3962643 (1976-06-01), Ma
patent: 4298290 (1981-09-01), Ijichi
patent: 4379269 (1983-04-01), Ijichi
patent: 4612571 (1986-09-01), Moon
Chin Tommy P.
Kabushiki Kaisha Toshiba
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