Volume control apparatus
    1.
    发明授权
    Volume control apparatus 失效
    音量控制装置

    公开(公告)号:US4451796A

    公开(公告)日:1984-05-29

    申请号:US300458

    申请日:1981-09-08

    申请人: Satoshi Yasumura

    发明人: Satoshi Yasumura

    CPC分类号: H03G3/3005 H03G3/04

    摘要: A volume control apparatus for use in an acoustic apparatus with a sound signal source and an amplifier which is usable as an alarm or warning apparatus. The volume control apparatus is provided with a motor for operating a volume control variable resistor, a manually operatable presetting variable resistor and first, second and third selectively operable manual switching means. Upon each power supply, the volume control variable resistor is always automatically set by the motor to a position corresponding to a preset position of the presetting variable resistor regardless of its position prior to the power supply.By selectively operating the first and second switching means at a desired moment after the power supply, the volume control variable resistor is set by the motor from the position corresponding to the preset position of the presetting variable resistor to a desired position regardless of its previous position.By operating the third switching means at a desired moment after the power supply, the presetting variable resistor can be adjusted while listening to a sound produced by a speaker.

    摘要翻译: 一种用于具有声音信号源和可用作报警或警告装置的放大器的声学装置中的音量控制装置。 音量控制装置设置有用于操作音量控制可变电阻器的电动机,可手动操作的预设可变电阻器和第一,第二和第三选择性操作的手动开关装置。 在每个电源上,音量控制可变电阻器始终由电动机自动设置到与预置可变电阻器的预设位置相对应的位置,而不管其在电源之前的位置如何。 通过在电源之后的期望时刻选择性地操作第一和第二开关装置,音量控制可变电阻器由电动机从与预设可变电阻器的预设位置相对应的位置设定到期望位置,而不管其前一位置 。 通过在电源之后的期望时刻操作第三开关装置,可以在收听由扬声器产生的声音的同时调节预置可变电阻器。