Recovery system for a control loop

Details Recovery system for a control loop Recovery system for a control loop

1984-11-30

1986-10-14

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

455265, H04N 944

Patent

active

046175873

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. A latching circuit, subject to disabling only when receiver's color killer circuit operates in a color unkilling mode, is switched into a first latched mode of operation if voltage held by capacitor reaches a first extreme of its variation range, said first latched mode of operation forcing an unbalance of a first sense upon the voltage comparator inputs. Latching circuit is switched into a second latched mode of operation, forcing an opposite sense unbalance upon the voltage comparator inputs, if voltage held by capacitor reaches opposite extreme of its variation range.

REFERENCES:
patent: 3806668 (1974-04-01), Hilliker
patent: 3934191 (1976-01-01), Garskamp
patent: 4020500 (1977-04-01), Harwood
patent: 4088959 (1978-05-01), Sumi
patent: 4266245 (1981-05-01), Balaban
patent: 4485354 (1984-11-01), Shanley et al.
patent: 4555667 (1985-11-01), Cressey
patent: 4569064 (1986-02-01), Collin
U.S. patent application Ser. No. 666,835 of Shanley, filed 10/31/84.

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