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14 条记录 (耗时 0.021 秒)

    Bell signal generating circuit
    8.
    发明授权
    Bell signal generating circuit 失效
    贝尔信号发生电路

    公开(公告)号：US5335270A

    公开(公告)日：1994-08-02

    申请号：US108282

    申请日：1993-08-19

    申请人： Masayuki Tsurusaki ,  Takashi Watanabe

    发明人： Masayuki Tsurusaki ,  Takashi Watanabe

    IPC分类号： H04M3/02 ,  H04M19/04

    CPC分类号： H04M19/04

    摘要： A bell signal generating circuit for a key telephone set. A dc component of a pulse signal is removed by a photo-coupler to generate a first signal. A high frequency component of the first signal is removed by a filter to generate a second signal. A differential amplifier amplifies the second signal to generate a bell signal. To the differential amplifier, a dc supply voltage based on the dc signal in synchronism when the pulse signal is applied.

    摘要翻译： 一种用于密钥电话机的铃声信号发生电路。 通过光耦合器去除脉冲信号的直流分量以产生第一信号。 第一信号的高频分量被滤波器去除以产生第二信号。 差分放大器放大第二信号以产生振铃信号。 对于差分放大器，当施加脉冲信号时，基于直流信号的直流电源电压同步。

    Telephone line interface circuit
    9.
    发明授权
    Telephone line interface circuit 失效
    电话线接口电路

    公开(公告)号：US5105461A

    公开(公告)日：1992-04-14

    申请号：US521330

    申请日：1990-05-09

    申请人： Masayuki Tsurusaki ,  Setsuo Kimura

    发明人： Masayuki Tsurusaki ,  Setsuo Kimura

    IPC分类号： H04M1/00 ,  H04M1/31 ,  H04M1/738

    CPC分类号： H04M1/312 ,  H04M1/738

    摘要： A telephone line interface circuit for connecting telephone equipment provided with internal speech lines having predetermined DC impedance to external telephone lines, comprising a rectifying circuit connected with the telephone lines for rectifying the DC voltage coming from the telephone lines; a dial pulse sending circuit which makes connection and disconnection between the output terminals of the rectifying circuit and the internal speech lines for sending dial pulses to the telephone lines; and a polarity inversion detecting circuit which discriminates th evoltage relationship between the telephone lines and the internal speech lines for detecting the polarity inversion of the DC voltage coming from the telephone lines.

    摘要翻译： 一种电话线路接口电路，用于将具有预定DC阻抗的内部语音线路的电话设备连接到外部电话线路，包括与电话线连接的整流电路，用于整流来自电话线路的直流电压; 拨号脉冲发送电路，其使得整流电路的输出端子与用于向电话线发送拨号脉冲的内部语音线路之间的连接和断开; 以及极性反转检测电路，其鉴别电话线和内部语音线之间的放大关系，用于检测来自电话线的DC电压的极性反转。

    Key telephone system
    10.
    发明授权
    Key telephone system 失效
    关键电话系统

    公开(公告)号：US5033081A

    公开(公告)日：1991-07-16

    申请号：US580543

    申请日：1990-09-11

    申请人： Masayuki Tsurusaki

    发明人： Masayuki Tsurusaki

    IPC分类号： H04Q3/58 ,  H04M1/60 ,  H04M9/00 ,  H04M9/08

    CPC分类号： H04M9/085 ,  H04M9/002

    摘要： A key telephone system comprising a terminal device and a main apparatus which exchanges speech signals with the terminal device, the terminal device having a loudspeaking circuit for providing a predetermined amount of loss to either one of first speech signals selected to be transmitted to the main apparatus and second speech signals received from the main apparatus to prevent howling in a loudspeaking conversation mode, said system comprising: a first communication unit provided in the terminal device, for sending the first speech signals to the main apparatus through a first channel and receiving the second speech signals from the main apparatus through a second channel separated from the first channel; second communication unit provided in the main apparatus and connected to the first communication unit, for receiving the first speech signals from the first communication unit through the first channel and sending the second speech signals to the first communication unit through the second channel; in the first and second communication unit side tones between the first and second speech signals not being generated, whereby the predetermined amount of the loss caused by the loudspeaking circuit can be set to less than a loss which may be required for howling prevention if the side tones are generated.

    摘要翻译： 一种密钥电话系统，包括终端设备和与终端设备交换语音信号的主设备，终端设备具有一个扬声电路，用于向被选择发送到主设备的第一话音信号中的任一个提供预定量的丢失 以及从主设备接收的第二语音信号以防止在扬声对话模式中的啸叫，所述系统包括：第一通信单元，设置在终端设备中，用于通过第一信道将第一语音信号发送到主设备，并接收第二语音信号 来自主设备的语音信号通过与第一信道分离的第二信道; 第二通信单元，设置在主设备中并连接到第一通信单元，用于通过第一信道从第一通信单元接收第一语音信号，并通过第二信道将第二语音信号发送到第一通信单元; 在第一和第二通信单元中，在不产生第一和第二语音信号之间的第一和第二通信单元中，由扬声器产生的损失的预定量可以被设置为小于防止啸声所需的损失 生成色调。