Noise reduction circuit

Details Noise reduction circuit Noise reduction circuit

1975-06-20

1976-09-14

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 59, 330136, 330141, 330144, 330149, H03G 330

Patent

active

039809641

ABSTRACT:
A noise reduction circuit for uncompressed and randomly compressed audio signals comprises a variable gain stage providing a gain which varies with the magnitude of a DC control signal fed to a control terminal thereby, an AC to DC converter for generating a DC signal proportional to the amplitude of the AC signal fed thereto and a filter for passing middle and upper frequencies and for eliminating or substantially reducing the low frequencies fed thereto and coupled between the audio signal input and the input to said AC to DC converter.

REFERENCES:
patent: 2358045 (1944-09-01), Barney
patent: 3757254 (1973-09-01), Takahashi et al.
patent: 3798562 (1974-03-01), Takahashi et al.

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