Lock detector and confidence system for multiple frequency range

Details Lock detector and confidence system for multiple frequency range Lock detector and confidence system for multiple frequency range

1991-07-09

1992-06-23

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 20, 331 25, 331DIG2, 358158, H03L 706, H04N 505

Patent

active

051246716

ABSTRACT:
An adaptive oscillator control system for use in television receivers or monitors includes a phase locked loop together with a static phase error correction system which responds to long term error signals of significant magnitude within the phase locked loop. An oscillator range control includes a processor establishing a plurality of oscillator frequency ranges identified by oscillator range code numbers. First and second frequency approximations are provided using the oscillator range code number. A confidence circuit examines the consistency of oscillator frequency maintenance within the appropriate frequency range and upon establishing the desired confidence level enables the phase locked loop to provide synchronization. Thereafter, a lock detector responds to the occurrence of frequency and phase lock by the phase lock loop to enable the static phase error corrector and deactivate the oscillator range control system. The lock detector upon detecting horizontal synchronization, for broadcast type video, increases the second frequency approximation range.

REFERENCES:
patent: 4680555 (1987-07-01), Waldeck
patent: 4761587 (1988-08-01), Wharton
patent: 4991023 (1991-02-01), Nicols
patent: 4996596 (1991-02-01), Hirao et al.

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