Signal detecting circuit

Details Signal detecting circuit Signal detecting circuit

H - Electricity

04

B

325/120

H04B 1/10 (2006.01) G01R 19/00 (2006.01) G01V 1/36 (2006.01)

Patent

CA 1155183

ABSTRACT OF THE DISCLOSURE A time averaging circuit which increases signifi- cantly the signal to noise ratio of a received signal. The output of a multiplier which provides near D.C. signals with the noise is fed to a metal core transformer through an operational amplifier. The secondary winding output of the transformer is partly subtracted from the input in the operational amplifier, enhancing the D.C.-like signal components. Time integration via the feed back loop results in the A.C. noise components being relatively reduced in amplitude. The A.C.-noise components from the secondary of the transformer and the output of the operational amplifier are subtracted in a second operational amplifier, the output signal of which has substantially increased signal to noise ratio. A pre-processing circuit includes a multiplier which multiplies the received signal with a narrow band-width portion thereof, tuned to the signal frequency, which enriches the near D.C. energy.

242716

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