Circuit for detecting existance of information signal

Details Circuit for detecting existance of information signal Circuit for detecting existance of information signal

G - Physics

01

R

328/167

G01R 19/165 (2006.01) G01R 29/00 (2006.01) G11B 7/00 (2006.01) G11B 19/12 (2006.01) G11B 20/10 (2006.01)

Patent

CA 1191559

CIRCUITS FOR DETECTING EXISTENCE OF AN IMFORMATION SIGNAL ABSTRACT OF THE DISCLOSURE A circuit for detecting existence of an information signal comprising input circuit means provided to be supplied with the information singal, clamp circuit means for clamping a signal obtained from the input circuit means to a predetermined fixed DC level, a level detector for detecting the amplitude level of an output of the clamp circuit means and producing a DC output with its level corresponding to the detected amplitude level, and a level comparator for comparing the DC output from the level detector with a predetermined reference voltage to produce an output signal taking a fist level when the DC output is higher than the reference voltage and a second level when the DC output is lower than the reference voltage. The first level or second level of the output signal from the level comparator indicates that the information signal is supplied to the input circuit means.

410982

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