Circuit and method for automatically controlling the carrier fre

Details Circuit and method for automatically controlling the carrier fre Circuit and method for automatically controlling the carrier fre

1992-08-25

1994-09-13

Mis, David

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

360 30, 331 2, H03C 309, H03L 100, H03L 700, H03L 706

Patent

active

053472403

ABSTRACT:
A circuit for automatically controlling a carrier frequency of a video tape recorder includes a voltage controlled oscillator, a phase detector for generating an error signal representing a phase difference between an output signal of the voltage controlled oscillator and a reference signal, an integrating circuit for converting the error signal into an error voltage, and a frequency modulator with the same structure and characteristics as the voltage controlled oscillator for generating a carrier signal having a carrier frequency equal to a frequency of the reference signal in response to both the error voltage and a voltage level of a luminance component of a video signal voltage controlled oscillator changes the oscillation frequency to have the same value as the frequency of the reference signal in response to the error voltage.

REFERENCES:
patent: 4567448 (1986-01-01), Ikeda
patent: 4686584 (1987-08-01), Kojima et al.
patent: 4749961 (1988-06-01), Kato et al.
patent: 5043677 (1991-08-01), Tomasetti et al.
patent: 5075639 (1991-12-01), Taya
patent: 5138282 (1992-08-01), Bailey et al.
patent: 5157359 (1992-10-01), Nogami et al.

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