Apparatus for shifting a tuning window

Details Apparatus for shifting a tuning window Apparatus for shifting a tuning window

1977-05-12

1979-05-22

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325468, 358191, H04B 126, H04N 544

Patent

active

041561996

ABSTRACT:
A television window tuning system has duty cycle adjustment means for selectively varying the duty cycle of the tuner associated local oscillator signal. Increasing the duty cycle of the local oscillator signal effectively shifts the tuning window in frequency space in one direction while decreasing the duty cycle shifts the window in the opposite direction. In one embodiment of the invention, the duty cycle adjustment means is set for producing a 0% duty cycle oscillator signal for deriving a tuning window particularly adaptable for use with conventional AFC systems.

REFERENCES:
patent: 3980951 (1976-09-01), Breeze et al.
patent: 4031549 (1977-06-01), Rast et al.
patent: 4038689 (1977-07-01), Rzeszewski et al.

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