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9 条记录 (耗时 0.015 秒)

    Phase-locked loop circuit
    1.
    发明公开
    Phase-locked loop circuit 失效
    Phasenregelkreisschaltung。

    公开(公告)号：EP0072751A2

    公开(公告)日：1983-02-23

    申请号：EP82401522.6

    申请日：1982-08-11

    申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  FUJITSU LIMITED

    发明人： Iwata, Atsushi ,  Kaneko, Takao ,  Ito, Akihiko ,  Saito, Tadahiro ,  Fukui, Hirokazu

    IPC分类号： H03L7/08

    CPC分类号： H03L7/0895

    摘要： The phase-locked loop circuit provides a phase comparator which receives input signals through a first input terminal, a loop filter which receives a first output and a second output of the phase comparator, and a voltage-controlled oscillator which produces output signals of an oscillation frequency proportional to the first output and the second output of the loop filter, the signals corresponding to output signals produced by the voltage-controlled oscillator being supplied to a second input terminal of the phase comparator so that the phase of the signals supplied to the first input terminal of the phase comparator is compared with the phase of the signals supplied to the second input terminal. In the present invention, the loop filter comprise a first capacitor connected to the output terminal of the loop filter, a second capacitor and a third capacitor each having a terminal connected to the output terminal of the loop filter, a charging circuit for electrically charging the first, second, and third capacitors, the charging circuit being connected in parallel with the second capacitor, and a discharging circuit for discharging the first, second, and third capacitors, the discharging circuit being connected in parallel with the third capacitor.

    摘要翻译： 锁相环电路提供一个相位比较器，它通过第一输入端接收输入信号，一个接收相位比较器的第一输出和第二输出的环路滤波器，以及产生振荡输出信号的压控振荡器 频率与环路滤波器的第一输出和第二输出成比例，对应于由压控振荡器产生的输出信号的信号被提供给相位比较器的第二输入端，使得提供给第一 将相位比较器的输入端与提供给第二输入端的信号的相位进行比较。 在本发明中 环路滤波器包括连接到环路滤波器的输出端的第一电容器，第二电容器和第三电容器，每个电容器具有连接到环路滤波器的输出端子的端子;充电电路，用于对第一，第二和/ 第三电容器，充电电路与第二电容器并联连接;以及放电电路，用于对第一，第二和第三电容器进行放电，放电电路与第三电容器并联连接。

    Adaptive echo canceller
    4.
    发明公开
    Adaptive echo canceller 失效
    自适应的ECHO CANCELLER

    公开(公告)号：EP0407962A3

    公开(公告)日：1992-12-23

    申请号：EP90113148.2

    申请日：1990-07-10

    申请人： FUJITSU LIMITED

    发明人： Chujo, Kaoru ,  Kakuishi, Mitsuo ,  Fukui, Hirokazu

    IPC分类号： H04B3/23

    CPC分类号： H04B3/231 ,  H04B3/234 ,  H04B3/238

    摘要： An adaptive echo canceller for suppressing an echo in an input signal by a pseudo echo, includes a pseudo echo generation filter (11) having a predicted impulse response sequence of an echo path as filter coefficients thereof for generating a pseudo echo, a coefficient renewal part (12, 4A) for adaptively renewing the filter coefficients of the pseudo echo generation filter, and a part for suppressing an echo by the pseudo echo which is generated by the pseudo echo generation filter. The coefficient renewal part includes a part (48) for dividing renewed filter coefficients into a plurality of groups each having a certain number of renewed filter coefficients, and a part (48, 49₁, 49₂, 47) for successively selecting one group with a predetermined period and carrying out a correction process with respect to the renewed filter coefficients within the selected group, where the correction process corrects an accumulation of errors of renewal processes.

    Adaptive echo canceller
    6.
    发明公开
    Adaptive echo canceller 失效
    Adaptaver Echokompensator。

    公开(公告)号：EP0407962A2

    公开(公告)日：1991-01-16

    申请号：EP90113148.2

    申请日：1990-07-10

    申请人： FUJITSU LIMITED

    发明人： Chujo, Kaoru ,  Kakuishi, Mitsuo ,  Fukui, Hirokazu

    IPC分类号： H04B3/23

    CPC分类号： H04B3/231 ,  H04B3/234 ,  H04B3/238

    摘要： An adaptive echo canceller for suppressing an echo in an input signal by a pseudo echo, includes a pseudo echo generation filter (11) having a predicted impulse response sequence of an echo path as filter coefficients thereof for generating a pseudo echo, a coefficient renewal part (12, 4A) for adaptively renewing the filter coefficients of the pseudo echo generation filter, and a part for suppressing an echo by the pseudo echo which is generated by the pseudo echo generation filter. The coefficient renewal part includes a part (48) for dividing renewed filter coefficients into a plurality of groups each having a certain number of renewed filter coefficients, and a part (48, 49₁, 49₂, 47) for successively selecting one group with a predetermined period and carrying out a correction process with respect to the renewed filter coefficients within the selected group, where the correction process corrects an accumulation of errors of renewal processes.

    摘要翻译： 一种用于通过伪回波抑制输入信号中的回波的自适应回波消除器包括具有作为其用于产生伪回声的滤波器系数的回波路径的预测脉冲响应序列的伪回波产生滤波器（11），系数更新部分 （12,4A），用于自适应地更新伪回波产生滤波器的滤波器系数，以及用于通过伪回波产生滤波器产生的伪回波抑制回波的部分。 系数更新部分包括用于将更新的滤波器系数分成多个组的部分（48），每个组具有一定数量的更新的滤波器系数;以及部分（48,491,492,47），用于连续地选择具有预定 对所选择的组中的更新的滤波器系数执行校正处理，其中校正过程校正更新处理的错误的累积。

    Phase-locked loop circuit
    7.
    发明公开
    Phase-locked loop circuit 失效
    相位锁定环路

    公开(公告)号：EP0072751A3

    公开(公告)日：1983-08-24

    申请号：EP82401522

    申请日：1982-08-11

    申请人： Nippon Telegraph and Telephone Public Corporation ,  FUJITSU LIMITED

    发明人： Iwata, Atsushi ,  Kaneko, Takao ,  Ito, Akihiko ,  Saito, Tadahiro ,  Fukui, Hirokazu

    IPC分类号： H03L07/08

    CPC分类号： H03L7/0895

    摘要： The phase-locked loop circuit provides a phase comparator which receives input signals through a first input terminal, a loop filter which receives a first output and a second output of the phase comparator, and a voltage-controlled oscillator which produces output signals of an oscillation frequency proportional to the first output and the second output of the loop filter, the signals corresponding to output signals produced by the voltage-controlled oscillator being supplied to a second input terminal of the phase comparator so that the phase of the signals supplied to the first input terminal of the phase comparator is compared with the phase of the signals supplied to the second input terminal. In the present invention, the loop filter comprise a first capacitor connected to the output terminal of the loop filter, a second capacitor and a third capacitor each having a terminal connected to the output terminal of the loop filter, a charging circuit for electrically charging the first, second, and third capacitors, the charging circuit being connected in parallel with the second capacitor, and a discharging circuit for discharging the first, second, and third capacitors, the discharging circuit being connected in parallel with the third capacitor.