Defect detecting apparatus

Details Defect detecting apparatus Defect detecting apparatus

1978-03-10

1980-02-19

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

360 38, H04N 576

Patent

active

041897455

ABSTRACT:
A defect detecting apparatus for detecting a minor defect of a length in the order of a time period corresponding to one half cycle of a carrier included in a reproduced video signal which has been recorded in frequency modulation form or a defect of the reproduced signal due to irregular phase change of the carrier to correct the video signal is disclosed. The apparatus comprises a band-pass filter for extracting a spectrum component due to the defect distributed in a playback demodulator output frequency spectrum including a high-pass filter for attenuating a video signal component and a low-pass filter for attenuating a frequency-multiplied carrier component, and a level comparator which produces an output when an output level of the band-pass filter exceeds a predetermined level.

REFERENCES:
patent: 3909518 (1975-09-01), Baker
patent: 3925811 (1975-12-01), Kenney
patent: 3969759 (1976-07-01), Amery
patent: 4001496 (1977-01-01), Clemens et al.
patent: 4006295 (1977-02-01), Oprandi et al.
patent: 4038686 (1977-07-01), Baker

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