Noise reducing circuit

Details Noise reducing circuit Noise reducing circuit

1991-03-26

1993-04-06

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

4552451, 455296, 381 10, 381 94, H04B 1500, H04B 1100, H04H 500

Patent

active

052010627

ABSTRACT:
A noise reducing circuit for reducing various noise in the output of a receiver. A noise attenuating circuit receives a demodulated signal and attenuates the noise in the demodulated signal in accordance with a control signal supplied thereto. A signal strength detecting circuit outputs a field intensity signal indicative of a strength of a radio wave signal inputted to the receiver. An output noise level detecting circuit outputs a noise level signal indicative of a noise level in the demodulated signal after the noise is attenuated. A fuzzy inferring circuit performs fuzzy inference in accordance with fuzzy production rules given by membership functions for the field intensity signal and the noise level signal, respectively so as to output an inference output. A control signal generating circuit produces the control signal on the basis of the inference output to control the noise attenuating circuit.

REFERENCES:
patent: 3851253 (1974-11-01), Eastmond
patent: 4480535 (1984-10-01), Kishi
patent: 4628529 (1986-12-01), Borth et al.
patent: 4703501 (1987-10-01), Sugai et al.
patent: 4811404 (1989-03-01), Vilmur et al.
patent: 4817151 (1989-03-01), Bod et al.
patent: 4833715 (1989-05-01), Sakai
patent: 5036543 (1991-07-01), Ueno
patent: 5113446 (1992-05-01), Kennedy

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