Noise reduction circuit having voltage to current converting mea

Details Noise reduction circuit having voltage to current converting mea Noise reduction circuit having voltage to current converting mea

1982-12-20

1984-07-24

Gensler, Paul L.

Wave transmission lines and networks

Amplitude compression and expansion systems

330110, 307542, H04B 164

Patent

active

044620080

ABSTRACT:
In a noise reduction circuit comprising a combining circuit which generates a combined signal in response to signals supplied thereto, a main channel which supplies an information signal substantially unchanged to the combining circuit, and an auxiliary channel which receives the information signal and which supplies a modified information signal to the combining circuit for combining with the unchanged information signal, the auxiliary channel includes a high pass filter with a variable cut-off frequency which generates a filtered output signal in response to the information signal supplied thereto, a voltage-current converting circuit which converts the voltage level of the filtered output signal to a current and which supplies the current to the combining circuit, and an amplitude limiting circuit which limits the amplitude of the current supplied to the combining circuit.

REFERENCES:
patent: 3818362 (1974-06-01), van Sluys
patent: 3828280 (1974-08-01), Dolby
patent: 3848194 (1974-11-01), Nishimura et al.
patent: 3903485 (1975-09-01), Dolby
patent: 3932768 (1976-01-01), Takahashi et al.
patent: 4220875 (1980-09-01), Lawton
patent: 4412189 (1983-10-01), Kominami et al.

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