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热词
    • 72. 发明授权
    • Loop extender
    • 循环延长器
    • US4130735A
    • 1978-12-19
    • US786563
    • 1977-04-11
    • Charles W. Chambers, Jr.Frederick J. KikoRobert J. Kretschmann
    • Charles W. Chambers, Jr.Frederick J. KikoRobert J. Kretschmann
    • H04M19/00H04Q1/30
    • H04M19/006
    • A loop extender for adding a series-aiding boost voltage to a subscriber loop of a telephone system and having a d.c. boost voltage supply, an amplifier circiit having an active device connecting the voltage supply in series with a conductor of said loop for applying to the loop a magnitude of boost voltage that is dependent upon the gain of the amplifier circuit, and a further circuit, including a feedback for the amplifier circuit, for controlling the gain of said amplifier circuit in such a way that said gain is increased to cause an increase in the applied boost voltage in response to a rise in the magnitude of the loop current to a first predetermined threshold and/or in such a way that said gain is decreased to cause a decrease in the applied boost voltage in response to a decrease in the magnitude of the loop current to a second predetermined threshold.
    • 一个环形延长器,用于向电话系统的用户环路添加一系列辅助升压电压,并具有直流。 升压电源,放大器具有有源器件,该有源器件将电压源与所述环路的导体串联连接,以向环路施加取决于放大器电路的增益的升压电压的幅度,以及另外的电路,包括 用于放大器电路的反馈,用于以这样的方式控制所述放大器电路的增益,使得增加所述增益以响应于环路电流的幅度上升到第一预定阈值而引起施加的升压电压的增加 和/或以使得所述增益减小以响应于环路电流的幅度减小到第二预定阈值而引起所施加的升压电压降低的方式。