| 摘要 |
An improved gain controller for use in an audio equipment for controlling the gain of an audio signal without causing any clipping distortion and keeping a good S/N ratio comprises a tone controller (1) for setting a frequency characteristic for attaining a preferable tone, a first electronic volume controller (2) arranged at the front stage of the tone controller (1) for attenuating an input signal, a second electronic volume controller (3) arranged at the rear stage of the tone controller (1) for attenuating the signal therefrom and a microprocessor (4) for controlling the first electronic volume controller (2), the second electronic volume controller (3) and the tone controller (1) in a cooperative manner. The amount of attenuation at the first electronic volume controller (2) is determined by the microprocessor (4) in response to the selected frequency characteristic in the tone controller (1) and the amount of attenuation at the second electronic volume controller (3) is determined by the microprocessor (4) in response to the total attenuation in the whole system. |
