Automatic phase control circuit

Details Automatic phase control circuit Automatic phase control circuit

1986-09-16

1987-08-04

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

358337, H04N 591

Patent

active

046849017

ABSTRACT:
An automatic phase control (APC) circuit with improved reliability of phase control, in which a phase of a reference signal from a crystal oscillator is alternately switched between two phases by a switch. The APC circuit includes a phase locked loop (PLL) for stabilizing a phase of a signal, e.g., a playback color signal of a VTR, with the phase of the reference signal, which is changed alternnately in phase between the two phases. An irregular detection (ID) circuit monitors the irregularity of the PLL. When a first monitored output of the ID circuit appears successively over two horizontal cycles, a burst ID processing for the PLL is actuated. When a second monitored output of the ID circuit follows after the first monitored output, the alternation timing of the reference signal is forcibly shifted by the switch.

REFERENCES:
patent: 4539602 (1985-09-01), Okano
patent: 4607360 (1986-08-01), Fukui
"National Technical Report", vol. 25, No. 1, Feb. 1979, [Video Signal Process of PAL, SECAM VTR], Auther: Chojuro Yamashita.

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