Cut-off frequency automatic adjusting filter

Details Cut-off frequency automatic adjusting filter Cut-off frequency automatic adjusting filter

1991-07-17

1993-04-06

Gensler, Paul

Wave transmission lines and networks

Automatically controlled systems

307521, H03H 1104

Patent

active

052007162

ABSTRACT:
A cut-off frequency automatic adjusting filter includes a plurality of filters, one of them being a reference filter, and a feedback circuit for the reference filter. The feedback circuit is formed by a subtracter, a full-wave rectifier, an integrator and an error amplifier. A square wave signal is inputted to the reference filter as a reference signal instead of a sine wave signal in the conventional filter. The feedback circuit generates an electrical signal which causes the cut-off frequency of the reference filter and another filter to be constant.

REFERENCES:
patent: 4818903 (1989-04-01), Kawano
patent: 4888502 (1989-12-01), Jarrett

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