Noise immune circuit for use with frequency sensor

Details Noise immune circuit for use with frequency sensor Noise immune circuit for use with frequency sensor

1986-05-08

1988-02-23

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307542, 307546, 307520, 328165, H03B 104, H03K 508

Patent

active

047272708

ABSTRACT:
A noise immune circuit for use with pulse type sensors whereby a noise modulated signal is clipped and shaped in a hard limiter to a square wave signal before being filtered by a low pass filter. A Schmitt trigger with substantial feedback then biases the threshold of said hard limiter for discrimination of noise from signal.

REFERENCES:
patent: 4256975 (1981-03-01), Fukushima et al.
patent: 4333024 (1982-06-01), Maussion
patent: 4462008 (1984-07-01), Katakura
patent: 4544951 (1985-10-01), Yoshisato

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