Defect detecting apparatus

Details Defect detecting apparatus Defect detecting apparatus

H - Electricity

04

N

352/18, 350/37

H04N 5/91 (2006.01) H04N 9/882 (2006.01)

Patent

CA 1116287

ABSTRACT OF THE DISCLOSURE A defect detecting apparatus for detecting a minor detect 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.

298945

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