NTSC or pal signal detecting circuit of a laser disk player syst

Details NTSC or pal signal detecting circuit of a laser disk player syst NTSC or pal signal detecting circuit of a laser disk player syst

1994-10-28

1997-01-21

Chin, Tommy P.

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

348558, 386 46, H04N 576, H04N 546

Patent

active

055964222

ABSTRACT:
A circuit for detecting an NTSC signal or a PAL signal in a laser disk player system. In the laser disk player system, the circuit includes an FM video signal processing part for shaping a waveform of the FM video signal picked-up from the optical pick-up part and for outputting the waveform shaped signal; a BPF (Band Pass Filter) and integrator for filtering and integrating the FM video signal shaped in the waveform from the FM video signal processing part, and for outputting an integral value in the form of an electrical signal; and a comparator for comparing the integral value outputted from the BPF and integrator with a determined reference voltage, and for outputting an NTSC or PAL detecting signal. Thereby, the NTSC or PAL signal can be detected quickly.

REFERENCES:
patent: 4864427 (1989-09-01), Tanaka et al.
patent: 4914523 (1990-04-01), Maruta
patent: 5166807 (1992-11-01), Masuda et al.

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