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1. 发明授权

US4088963A Gain control circuit 失效
标题翻译：增益控制电路
公开(公告)号：US4088963A
公开(公告)日：1978-05-09
申请号：US694725
申请日：1976-06-10
申请人： Fujio Machida , Kazuya Takahashi
发明人： Fujio Machida , Kazuya Takahashi
IPC分类号： H03G3/30
CPC分类号： H03G3/3015
摘要： A gain control circuit includes an audio signal attenuator circuit and a circuit for controlling the current in the audio signal attenuator circuit. The audio signal attenuator circuit is inserted between an input terminal of an amplifier circuit for amplifying an audio signal and an output terminal of a diode for detecting and rectifying part of the audio signal appearing at the output terminal of the amplifier circuit. The signal attenuator circuit and the current control circuit comprise a plurality of transistors and operate when, in response to application of an audio signal to the amplifier circuit, a DC voltage of certain level is produced at the output terminal of the rectifying diode. Part of the audio signal applied to the amplifier circuit is bypassed and attenuated, while at the same time stabilizing the DC bias in the amplifier circuit.
摘要翻译：增益控制电路包括音频信号衰减器电路和用于控制音频信号衰减器电路中的电流的电路。音频信号衰减器电路被插入在用于放大音频信号的放大器电路的输入端和用于检测和整流出现在放大器电路的输出端的音频信号的一部分的二极管的输出端之间。信号衰减器电路和电流控制电路包括多个晶体管，当响应于向放大器电路施加音频信号时，在整流二极管的输出端产生一定电平的直流电压。施加到放大器电路的音频信号的一部分被旁路和衰减，同时稳定放大器电路中的DC偏置。

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