Circuit for detecting existence of an information signal

Details Circuit for detecting existence of an information signal Circuit for detecting existence of an information signal

1985-04-18

1986-02-25

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

455222, 369 59, 369124, 307350, 307542, H03K 1716, H04B 1500

Patent

active

045729654

ABSTRACT:
A circuit for detecting existence of an information signal comprising an input circuit provided for supply with the information signal, a clamp circuit for clamping a signal obtained from the input circuit to a predetermined fixed DC level, a level detector for detecting the amplitude level of an output of the clamp circuit and for 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 assuming a first 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.

REFERENCES:
patent: 3760255 (1973-09-01), Grodinsky
patent: 3983417 (1976-09-01), Rheinfelder
patent: 4124819 (1978-11-01), Hansen

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