Pulse width limiter

Details Pulse width limiter Pulse width limiter

1981-01-12

1982-06-08

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 508, H04N 504

Patent

active

043342434

ABSTRACT:
A pulse width limiter is described for extracting horizontal sync pulses from a composite sync signal and applying the extracted sync pulses to a horizontal phase detector. The pulse width limiter includes a signal processing path and a pulse width sensor. The signal processing path has an input terminal for receiving the composite sync pulse and an output terminal which is coupled to the phase detector. A switch couples the input terminal to the output terminal under normal conditions and decouples the input terminal from the output terminal in response to a disabling signal. The pulse width sensor also receives the composite sync pulse and detects the width of each pulse therein. When the pulse width sensor senses that a particular pulse has a width greater than a predetermined width, the sensor applies a disabling signal to the switch in the signal processing path thereby preventing portions of the pulses greater than the predetermined width from being coupled to the phase detector.

REFERENCES:
patent: 3172951 (1965-03-01), Field
patent: 3688037 (1972-08-01), Epri
patent: 4064541 (1977-12-01), Schneider et al.

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