Gain controller

Details Gain controller Gain controller

1989-12-20

1992-06-30

Isen, Forester W.

Electrical audio signal processing systems and devices

Including frequency control

Automatic tone control

H03G 900

Patent

active

051270587

ABSTRACT:
An improved gain controller for use in an audio equipment for controlling a gain of an audio signal without causing any clipping distortion and keeping a good S/N ratio. The gain controller in accordance with this invention comprises a tone controller for setting a frequency characteristic for attaining a preferable tone, a first electronic volume controller arranged at the front stage of the tone controller for attenuating an input signal, a second electronic volume controller arranged at the rare stage of the tone controller for attenuating the signal therefrom and a microprocessor for controlling the first electronic volume controller, the second electronic volume controller and the tone controller in a cooperative manner, thereby the amount of attenuation at the first electronic volume controller is determined by the microprocessor in response to the selected frequency characteristic in the tone controller and the amount of attenuation at the second electronic volume controller is determined by the microprocessor in response to the total attenuation in the whole system.

REFERENCES:
patent: 3293364 (1966-12-01), Richter
patent: 4396806 (1983-08-01), Anderson
patent: 4885792 (1989-12-01), Christensen et al.
patent: 4888811 (1989-12-01), Takashi
patent: 4926485 (1990-05-01), yamashita
J. R. Cox, "Squealer Killer with Real-Time Equalization", Journal of the Audio Engineering Society, vol. 32, No. 3, Mar. 1984.
Patent Abstracts of Japan, vol. 12, No. 423, Nov. 9, 1988.
Patent Abstracts of Japan, vol. 13, No. 453, Oct. 12, 1989.

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