Signal detecting circuit

Details Signal detecting circuit Signal detecting circuit

1976-12-23

1985-02-05

Blum, Theodore M.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330154, H03F 126, H03F 130

Patent

active

044980523

ABSTRACT:
A time averaging circuit which increases significantly 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.

REFERENCES:
patent: 2234461 (1941-03-01), Tubbs
patent: 2256512 (1941-09-01), Artzt
patent: 2273511 (1942-02-01), Bruck
patent: 2904627 (1959-09-01), Cotsworth
patent: 2978646 (1961-04-01), Shumard

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