Oscillator synchronizing system for eliminating static phase err

Details Oscillator synchronizing system for eliminating static phase err Oscillator synchronizing system for eliminating static phase err

1984-10-31

1986-09-09

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 25, 331 8, 331 17, 331 19, 331 20, H04N 945, H04N 9455

Patent

active

046112391

ABSTRACT:
Non-inverting amplifier, with bandpass filter in regenerative feedback path, forms color reference oscillator in a color TV receiver. Phase shift circuit, responsive to an oscillator output, supplies signals to a first phase shifted signal amplifier, which shares a load with the non-inverting amplifier, and is subject to control by complementary outputs of a phase comparator functioning to compare the phase of an oscillator output with the phase of incoming color synchronizing bursts. A voltage comparator, responsive to the respective phase comparator outputs, is periodically enabled by field rate keying pulses. The voltage comparator output controls the charging or discharging of a capacitor during the keying intervals. A second phase shifted signal amplifier, responsive to the output of the phase shift circuit, and delivering its output to the oscillator's feedback path, is subject to control in dependence upon a comparison of a control voltage derived from the voltage held by the capacitor with a reference DC voltage.

REFERENCES:
patent: 4020500 (1977-04-01), Harwood
patent: 4047223 (1977-09-01), Hofmann
patent: 4229759 (1980-10-01), Harwood et al.
patent: 4249199 (1981-02-01), Harwood et al.
patent: 4485353 (1984-11-01), Fang et al.
patent: 4485354 (1984-11-01), Shanley, II et al.
U.S. patent application Ser. No. 594,398, to Harwood. (filed 3/28/84).

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