Frequency modulator comprising an adjusting circuit

Details Frequency modulator comprising an adjusting circuit Frequency modulator comprising an adjusting circuit

1995-05-04

1997-01-07

Mis, David

Modulators

Frequency modulator

332124, 360 30, 455 44, 455110, 386 26, H03C 300, H03C 308, G11B 2006

Patent

active

055921329

ABSTRACT:
In a frequency modulator (1) having an adjusting circuit by which frequency modulator an applied luminance signal of a color video signal that contains synchronization pulses is frequency modulated, while the chrominance signal of the color video signal is modulated on a carrier, that has a quiescent frequency if no color information is available. A capacitor is provided for an automatic mode of operation, and is charged or discharged, respectively, in dependence on the period duration of the modulator output signal and in dependence on the period duration of the quiescent frequency of the chrominance carrier. The steepness of the voltage/frequency characteristic curve of the modulator is set dependent upon the charge condition of the capacitor, while the charging-to-discharging ratio is selected such that the charge of the capacitor is maintained constant on average, if the modulator frequency is equal to a predefined nominal frequency and increases or decreases, respectively, if the modulator frequency falls short of or exceeds the nominal frequency during the synchronization pulses.

REFERENCES:
patent: 4554517 (1985-11-01), Parniere et al.
patent: 4839615 (1989-06-01), Sato
patent: 4918529 (1990-04-01), Douziech et al.
patent: 5157359 (1992-10-01), Nogami et al.
patent: 5517159 (1996-05-01), Hwang

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