Circuit for detecting a drop-out of a frequency modulated video

Details Circuit for detecting a drop-out of a frequency modulated video Circuit for detecting a drop-out of a frequency modulated video

1990-04-13

1991-09-17

Envall, Jr., Roy N.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358314, 360 381, H04N 594

Patent

active

050500023

ABSTRACT:
A drop-out detecting circuit forms a drop-out detecting signal on the basis of the result of comparing the frequency of a frequency modulated video signal reproduced from a slant track on a magnetic tape with a reference frequency. The level of a reproduction state detecting signal formed on the basis of the envelope of the reproduced frequency modulated video signal is compared with a predetermined level and the above reference frequency is varied on the basis of the compared result.

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patent: 4604659 (1989-08-01), Itoh et al.
patent: 4623994 (1986-11-01), Nabshima et al.
patent: 4737723 (1988-04-01), Mita

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