Circuit for detecting a video mode

Details Circuit for detecting a video mode Circuit for detecting a video mode

1989-03-17

1991-02-05

Psitos, Aristotelis M.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358310, 360 27, 369 48, H04M 9491

Patent

active

049910272

ABSTRACT:
The detection of whether an input FM signal, such as a reproduced signal, which includes particular frequency components representing predetermined information, was recorded in a first or second mode, with the modes having different frequency bands. A first output signal is produced when a particular frequency component in one of the frequency bands is detected and a second output signal is produced when a different frequency component, approximately equal to the difference between twice a predetermined frequency included in the other of the frequency bands and the particular frequency in the one frequency band, is detected. A mode identifying signal indicative of the frequency band occupied by the FM signal is produced in response to the first and second output signals.

REFERENCES:
patent: 4642704 (1987-02-01), Doutsubo
patent: 4686585 (1987-08-01), Sato

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