Device for deriving a clock signal from a synchronizing signal a

Details Device for deriving a clock signal from a synchronizing signal a Device for deriving a clock signal from a synchronizing signal a

1996-02-20

1999-03-02

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327142, 327154, 327155, 327156, 327160, H03K 522, H03L 7199

Patent

active

058776400

ABSTRACT:
A device for deriving a clock signal having a specific frequency, from an electrical signal, for example, a video signal, the device including an input terminal (1) for receiving the synchronizing signal; a phase comparator (5) having a first input coupled to the input terminal, a second input and an output; a voltage controlled oscillator (15) having an input coupled to the output of the phase comparator, and an output; a counter (23) having a first input coupled to the output of the voltage controlled oscillator, a second input for receiving a preset control signal, and an output coupled to the second input of the phase comparator; a preset control signal generator (30) having an input coupled to the input terminal, and an output coupled to the second input of the counter, the counter being adapted to set its count value to a preset value in response to the preset control signal applied to its preset control signal input. The preset control signal generator includes a window signal generator (48) for determining a window signal in response to a specified count value in the counter; and a detector (34, 36) for detecting whether at least one edge in the synchronizing signal falls outside a time interval defined by the window signal, and for generating the preset control signal in response to this detection, the detector having an input coupled to the input of the preset control signal generator and an output coupled to the output of the preset control signal generator.

REFERENCES:
patent: 3573634 (1971-04-01), Rachel
patent: 3701953 (1972-10-01), Lubarsky, Jr.
patent: 5012198 (1991-04-01), Okada et al.
patent: 5019907 (1991-05-01), Murakoshi et al.
patent: 5043966 (1991-08-01), Zwaans
patent: 5457428 (1995-10-01), Alder et al.
patent: 5635875 (1997-06-01), Kusakabe

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