Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-09-12
1991-01-15
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
455 3, 455 4, 455151, 307140, H04N 5268, H04B 1116
Patent
active
049857720
ABSTRACT:
A TV decoder low loss switching system includes relay operated switch contacts for directly connecting an input signal without loss to a decoder tuner in the normal or enabled mode or bypassing the input signal to a TV in the bypass mode. The switch is parallelled by an impedance to permit a small amount signal singal to be applied to the tuner (in the bypass mode) for data purposes. In one embodiment, a second set of simultaneously actuated contacts connects the output of the decoder to the output terminal. In another embodiment, a channel 3/4 modulator is supplied by the decoder and its output connected via a PIN diode to the output terminal. The PIN diode is biased into conduction by actuation of a transistor switch responsive to the microprocessor enabling the decoder. The conduction of the PIN diode permits the channel 3/4 modulator signal to pass to the output terminal.
REFERENCES:
patent: 3686573 (1972-08-01), McVoy
patent: 4276562 (1981-06-01), Stewart et al.
patent: 4577221 (1986-03-01), Skinner, Sr. et al.
patent: 4630313 (1986-12-01), Damoci
patent: 4717970 (1988-01-01), Long
patent: 4783846 (1988-11-01), Wachob
patent: 4941048 (1990-07-01), Hartson et al.
Long Michael E.
Stramello Peter
Groody James J.
Powell Mark R.
Zenith Electronics Corporation
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