Lockup inhibiting arrangement for a phase locked loop tuning sys

Details Lockup inhibiting arrangement for a phase locked loop tuning sys Lockup inhibiting arrangement for a phase locked loop tuning sys

1977-01-24

1978-08-29

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325423, 325459, 358193, H04N 550, H04B 126

Patent

active

041106938

ABSTRACT:
In a phase locked loop tuning system for a television receiver including a frequency divider for prescaling the frequency of a local oscillator signal generated by a controlled oscillator, a lockup inhibiting arrangement is provided for causing the controlled oscillator to temporarily oscillate at a frequency for which the amplitude of the local oscillator signal is sufficiently high to overcome any self-oscillation of the prescaler before phase locked loop control is enabled whenever the receiver is initially turned on or when a channel in a new band is selected.

REFERENCES:
patent: 3480865 (1969-11-01), Sanders
patent: 3626301 (1971-12-01), Develet, Jr.
patent: 3697885 (1972-10-01), Avins
patent: 3769602 (1973-10-01), Griswold
patent: 3805192 (1974-04-01), Ocnaschek et al.
patent: 4000476 (1976-12-01), Walker
patent: 4009439 (1977-02-01), Rast
patent: 4031549 (1977-06-01), Rast et al.

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