• 文中介绍一种新型总线形式、双工通话对讲系统给出完整电路原理图调试方法

    The paper introduces a new type of common line talk back system. Complete circuit diagram and an adjusting method are presented in this paper.

    youdao

  • 系统利用得到来电号码存储黑名单中的号码进行比较,判断振铃线路抑或控制模拟挂机电路挂机。

    The system USES Caller ID, with the store's blacklist of Numbers, the judgement is connected to phone lines ringing, or simulated hang up control circuit hang up.

    youdao

  • 系统利用得到来电号码存储黑名单中的号码进行比较,判断振铃线路抑或控制模拟挂机电路挂机。

    The system USES Caller ID, with the store's blacklist of Numbers, the judgement is connected to phone lines ringing, or simulated hang up control circuit hang up.

    youdao

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