Frequency locking system using sound intermediate frequency (IF)

Details Frequency locking system using sound intermediate frequency (IF) Frequency locking system using sound intermediate frequency (IF)

1993-12-15

1995-05-16

Groody, James J.

Television

Synchronization

Automatic phase or frequency control

348536, 348738, H04N 504

Patent

active

054165270

ABSTRACT:
A frequency controlled clock circuit for use in a television receiver utilizes a detected sound intermediate frequency (IF) signal for use in controlling a voltage controlled oscillator and thereby provide immunity from ghost signals in the transmitted video signal. A phase locked loop responds to phase errors detected from the voltage controlled oscillator and a reference signal from the sound IF signal to control the frequency of the voltage controlled oscillator.

REFERENCES:
patent: 4514763 (1985-04-01), Rindal
patent: 4953021 (1990-08-01), Ishikawa et al.

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