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    • 10. 发明授权
    • Analog subscriber circuit
    • 模拟用户电路
    • US06590977B1
    • 2003-07-08
    • US09338141
    • 1999-06-22
    • Kiyoshi Taguchi
    • Kiyoshi Taguchi
    • H04M100
    • H04M19/04H04M1/573H04M19/005
    • A subscriber circuit is capable of realizing a CLIP service in an old-fashioned switching system. The subscriber circuit has a ringer transmitting circuit, which is connected to line A and line B, and which transmits a ringer signal in accordance with a ringer transmission request signal from a host system; a battery feed circuit, which supplies speech current to line A and line B; and a timer, which detects, in accordance with a change in the level of a ringer transmission request signal from the above-mentioned host system, the end of transmission of a ringer signal transmitted by the ringer transmitting circuit, starts timer operation, and ends this timer operation after a predetermined time has elapsed. The battery feed circuit supplies speech current to line A and line B from the above-mentioned battery feed circuit during the operation period of the timer.
    • 用户电路能够在老式交换系统中实现CLIP服务。 用户电路具有连接到线路A和线路B的振铃器发射电路,并且根据来自主机系统的振铃器发送请求信号发送振铃信号; 电池馈电电路,其向线路A和线路B提供语音电流; 以及定时器,其根据来自上述主机系统的振铃发送请求信号的电平的变化检测由振铃器发送电路发送的振铃信号的发送结束,开始定时器操作,并结束 经过预定时间之后的该定时器操作。 在定时器的操作期间,电池供给电路将来自上述电池供给电路的线路A和线路B的语音电流供给。