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1. 发明授权

US4434325A Volume control for an audio apparatus 失效
标题翻译：音频设备的音量控制
公开(公告)号：US4434325A
公开(公告)日：1984-02-28
申请号：US396772
申请日：1982-07-09
申请人： Kozo Kobayashi , Mamoru Minamishima
发明人： Kozo Kobayashi , Mamoru Minamishima
IPC分类号： G11B20/04 , H03G1/00 , H03G3/00 , H03G3/04 , H03G3/02
CPC分类号： H03G1/0047 , H03G3/00 , H03G3/04
摘要： This invention relates to a volume control for an audio apparatus and more particularly to a fader for fading in or out a level of an audio signal. The volume control of the invention comprises a charge and discharge circuit having a capacitor charged and discharged by a constant current in response to a fade-in or fade out operation, and a function generator to generate a signal having a logarithmic waveform periodically repeated. A control signal generator compares the voltage across the capacitor of the charge and discharge circuit with the logarithmic waveform signal from the function generator to generate a control signal logarithmically varying in accordance with variation in the voltage across the capacitor of the charge and discharge circuit. An impedance controller logarithmically changes an impedance of an audio signal line in accordance with the control signal to logarithmically change the level of the audio signal in substance.
摘要翻译：音频装置的音量控制技术领域本发明涉及一种用于音频装置的音量控制，更具体地说，涉及一种用于衰减或降低音频信号电平的衰减器。本发明的音量控制包括充电和放电电路，其具有响应于淡入或淡出操作由恒定电流充电和放电的电容器，以及产生具有周期性重复的对数波形的信号的功能发生器。控制信号发生器将充电和放电电路的电容器两端的电压与来自函数发生器的对数波形信号进行比较，以产生根据充放电电路两端电容的变化对数变化的控制信号。阻抗控制器根据控制信号对数改变音频信号线的阻抗，以对数地改变音频信号的电平。

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