Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-07-20
1987-07-21
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
307273, H04N 504
Patent
active
046822267
ABSTRACT:
A monostable multivibrator provides accurate control of a timed output signal relative to an input pulse provided thereto. A pulse width control circuit of the multivibrator having a variable resistor is coupled to an RC circuit for controlling the extent to which a capacitor therein is charged without affecting the circuit's RC time constant. The rate of discharge of the timing capacitor thus remains unchanged resulting in a substantially constant discharge slope over a range of time delays. In addition, the duty cycle of the multivibrator may be varied over a wide range by merely changing the value of a single resistor therein which also does not affect the discharge rate of the multivibrator's timing circuit and thus does not introduce unwanted variations in the timing of the output pulse.
REFERENCES:
patent: 3469116 (1969-10-01), Nomura
patent: 3479529 (1969-11-01), van Dine
patent: 3719835 (1973-03-01), Eberhard
patent: 4253117 (1981-02-01), Kadlec
patent: 4544852 (1985-10-01), Moosmann et al.
Chin Tommy P.
Harvey David E.
Zenith Electronics Corporation
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