Dual-loop jitter correction circuit for correcting the time base

Details Dual-loop jitter correction circuit for correcting the time base Dual-loop jitter correction circuit for correcting the time base

1981-09-14

1984-08-28

Psitos, Aristotelis M.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358325, 358326, 369 45, H04N 944, G11B 700

Patent

active

044687095

ABSTRACT:
In a jitter correction circuit for correcting a time base error caused in a color television signal readout from a video disc due to a fluctuation in a disc rotating speed and an eccentricity of the disc, a first closed loop control circuit includes a first phase difference detector for detecting a first phase deviation of a horizontal synchronizing signal of the color television signal and a first variable time constant lag filter for producing a first control signal in response to the first phase deviation and a second closed loop control circuit includes a second phase difference detector for detecting a second phase deviation of a color burst signal of the color television signal and a second variable time constant lag filter for producing a second control signal in response to the second phase deviation. When the first phase deviation is greater than a predetermined level, only the first control signal is supplied to a voltage controlled oscillator to produce clock pulses for driving a delay device formed by a number of charge coupled devices. When the first phase deviation is reduced to the predetermined level, a sum of the first and second control signals is supplied to the voltage controlled oscillator.

REFERENCES:
patent: 3560634 (1971-02-01), Diller et al.
patent: 3580991 (1971-05-01), Krause
patent: 3637936 (1972-01-01), Krause
patent: 3820154 (1974-06-01), Faroudja et al.
patent: 4057833 (1977-11-01), Braat
patent: 4090215 (1978-05-01), Buchan et al.
patent: 4193085 (1980-03-01), Imamura
patent: 4313129 (1982-01-01), Fukui

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