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    Sound muting circuit with automatic sound return
    9.
    发明授权
    Sound muting circuit with automatic sound return 失效
    声音静音电路，具有自动回音功能

    公开(公告)号：US3870956A

    公开(公告)日：1975-03-11

    申请号：US39794273

    申请日：1973-09-17

    Applicant: ADMIRAL CORP

    Inventor： WOLFF ROBERT A

    IPC: H03G1/02 ,  H03G3/00 ,  H03G3/34 ,  H04B1/10

    CPC classification number: H03G1/02 ,  H03G3/005 ,  H03G3/34

    Abstract: A circuit to mute the sound of a television receiver or radio receiver by remote control including a muting switch and wherein the circuit disables the sound for a predetermined time after which the sound automatically is reconnected. If desired the sound may be returned earlier than the present time by depressing the muting switch a second time. A flip-flop circuit is triggerd from the muting switch to turn off a transistor connected in the sound system. While the sound system is disconnected a capacitor charges slowly through the base emitter junction of another transistor until the other transistor is suddenly turned off to provide a trigger for resetting the flip-flop which allows the first transistor to be turned on and sound to be reconnected to its output.

    Abstract translation: 一种通过包括静音开关的遥控器使电视接收机或无线电接收机的声音静音的电路，并且其中所述电路在预定时间内禁用声音，之后自动重新连接声音。 如果需要，可以通过再次按下静音开关来再次返回声音的时间。 触发器电路从静音开关触发，以关闭连接在声音系统中的晶体管。 当声音系统断开时，电容器通过另一个晶体管的基极发射极结缓慢充电，直到另一个晶体管突然关闭，以提供复位触发器的触发器，允许第一晶体管导通并且声音被重新连接 到其输出。

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