Noise trap circuit

Details Noise trap circuit Noise trap circuit

1987-05-04

1989-10-03

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Echo systems

367901, 455283, G01S 966

Patent

active

048721450

ABSTRACT:
A noise trap circuit particularly suitable for use in an electro-acoustic system, operates to suppress low level signals or noise while allowing a relatively large signal to pass unattenuated between input and output terminals of the circuit. Blocking elements between the input and output terminals establish a high impedance path to the noise but switch to a conductive state when the large signals are present at the input terminals. Shunt elements across the output terminals provide a low resistance path or "crowbar" when only the noise is present at the input terminals, but switch to a non-conductive state when the large signals are sensed at the circuit input.

REFERENCES:
patent: 3558917 (1971-01-01), Crouse
patent: 3716726 (1973-02-01), Trimble
patent: 3798559 (1974-03-01), Tomita et al.
patent: 4035734 (1977-07-01), Flormann et al.
patent: 4121183 (1978-10-01), Murphy

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