Frequency drop out detector circuit and method thereof

Details Frequency drop out detector circuit and method thereof Frequency drop out detector circuit and method thereof

1993-10-20

1995-08-01

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358314, 358342, 360 381, 348616, H04N 594, H04N 5945

Patent

active

054384257

ABSTRACT:
A frequency drop out compensating circuit and method thereof is applicable to the signals of both NTSC and PAL systems. The frequency drop out compensating circuit for NTSC/PAL systems in an optical disk system including an amplifier for amplifying an applied FM signal, a pulse generator for converting the frequency drop out signal detected from the amplified FM signal into a pulse signal and a drop out compensator for compensating the drop out when a frequency drop for the signal generated from the pulse generator is generated, has an integrator for integrating the FM signal generated from the amplifier and an integrating current controller for controlling the integrating current of the integrator according to the applied FM signal. Therefore, drop out can be detected and compensated in signals for both NTSC and PAL systems, by controlling the integrating current in consideration of the FM band utilized.

REFERENCES:
patent: 3949416 (1976-04-01), Stalley et al.
patent: 4644415 (1987-02-01), Serizawa et al.
patent: 4893192 (1989-01-01), Takemura
patent: 5050002 (1991-09-01), Suzuki et al.

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