Failsafe bandpass filter/decoder

Details Failsafe bandpass filter/decoder Failsafe bandpass filter/decoder

1990-10-01

1991-08-20

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307521, 328167, 333172, 333174, H03K 500, H03H 700

Patent

active

050417452

ABSTRACT:
A failsafe bandpass filter/decoder system comprising: an active bandpass filter which comprises a high-pass filter section having selected resistors which can only decrease in value during a failure mode and, in series with the high-pass filter section, a low-pass filter section having selected resistors which can only increase in value during a failure mode, whereby under any failure mode, the pass band of the filter will be reduced; and a level detector having an upper threshold voltage trip point and a lower threshold voltage trip point, both trip points having to be exceeded by the input wave form to produce a proper (square wave) output.

REFERENCES:
patent: 3532908 (1970-10-01), Jennings
patent: 3725802 (1973-04-01), Darrow
patent: 3946328 (1976-03-01), Boctor
patent: 4001710 (1977-01-01), Darrow
patent: 4016517 (1977-04-01), Sahasrabudhe et al.
patent: 4290027 (1981-09-01), Parker
patent: 4368440 (1983-01-01), Darrow

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