Lock-in noise rejection circuit

Details Lock-in noise rejection circuit Lock-in noise rejection circuit

1975-12-29

1977-04-19

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307246, 329122, H04B 112

Patent

active

040191486

ABSTRACT:
A lock-in filter that may be used to detect an AC data signal in the presence of high level noise signals that may occur in such systems as those used for acoustical telemetry in boreholes includes a pair of parallel capacitors receptive of the data and noise signals and circuitry operating in response to signals in the capacitors for alternately switching the capacitors to receive the noise and data signals in phase with the data signal.

REFERENCES:
patent: 3532997 (1970-10-01), Faye
patent: 3550023 (1970-12-01), Webb
patent: 3559081 (1971-01-01), Baudino et al.
patent: 3787774 (1974-01-01), Tietze
patent: 3904970 (1975-09-01), Shawhan

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