Phase-lock-loop circuit for a television apparatus

Details Phase-lock-loop circuit for a television apparatus Phase-lock-loop circuit for a television apparatus

1986-10-27

1987-08-25

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 1A, 331 25, 358158, H04N 506

Patent

active

046895825

ABSTRACT:
A digital phase-lock-loop circuit includes a generator that produces a horizontal rate output signal at a controlled frequency and a phase detector responsive to the output signal and to an incoming synchronizing signal. The phase detector is coupled to the generator control port via a loop filter. When the phase between the output signal and the synchronizing signal that synchronizes the phase-lock-loop circuit changes as a result of, for example, head switching in a two-head VTR that supplies the synchronizing signal, a signal representative of such phase change is produced. The phase change representative signal is fed forward to the generator, by bypassing the loop filter of the phase-lock-loop circuit. The phase change representative signal produces an immediate phase shift of the output signal such that the loop filter is not affected by the head switching.

REFERENCES:
patent: 4484152 (1984-11-01), Lee
A technical publication dated 1982 and published by RCA, Inc. Consumer Electronics Division, Indianapolis, Indiana, entitled Color Television Basic Service Data for CTC 111 series chassis.

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