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5 条记录 (耗时 0.012 秒)

    Echo canceller
    4.
    发明公开
    Echo canceller 失效
    回声消除器

    公开(公告)号：EP0333227A3

    公开(公告)日：1990-01-03

    申请号：EP89104848.0

    申请日：1989-03-17

    申请人： FUJITSU LIMITED

    发明人： Tanaka, Yoshinori ,  Unagami, Shigeyuki ,  Inoue, Masayoshi

    IPC分类号： H04B3/23

    CPC分类号： H04B3/232 ,  H04B3/237 ,  H04B3/238

    摘要： An echo canceller provided with an expected echo generating unit (101), which generates an ex- p.ected echo of a transmission signal, and a frequency offset correction unit (75) which detects a phase error between an echo in a received signal and an expected echo from the expected echo generating unit (101) and corrects the frequency offset for the expected echo by an offset frequency estimate based on the phase error, wherein use is made of the expected echo after offset correction by the frequency offset correction unit (75) so as to suppress the echo in the received signal, the frequency offset correction unit (75) using the phase error obtained after normalizing the phase error by )the magnitude of the echo in the received signal. By this, it is possible to perform frequency offset correction adaptive to the far-end echo characteristics. Further, it is desirable to perform the frequency offset correction after it is confirmed that the rate of change of the output from a subtractor for cancellation of the near-end echo has become almost zero.

    摘要翻译： 一种回波消除器，具备：生成发送信号的反馈回波的预期回波生成部（101）;以及检测接收信号中的回波之间的相位误差的频率偏移修正部（75） 来自期望回波产生单元（101）的期望回波，并且基于相位误差通过偏移频率估计校正期望回波的频率偏移，其中使用由频率偏移校正单元进行偏移校正之后的期望回波（ 所述频率偏移校正单元（75）使用在将所述相位误差归一化之后获得的相位误差）所述接收信号中的所述回声的大小，来抑制所述接收信号中的回声。 由此，可以进行适应于远端回声特性的频率偏移校正。 此外，在确认来自用于消除近端回波的减法器的输出的变化率几乎变为零之后，希望执行频率偏移校正。

    Echo canceller
    5.
    发明公开
    Echo canceller 失效
    Echokompensator。

    公开(公告)号：EP0333227A2

    公开(公告)日：1989-09-20

    申请号：EP89104848.0

    申请日：1989-03-17

    申请人： FUJITSU LIMITED

    发明人： Tanaka, Yoshinori ,  Unagami, Shigeyuki ,  Inoue, Masayoshi

    IPC分类号： H04B3/23

    CPC分类号： H04B3/232 ,  H04B3/237 ,  H04B3/238

    摘要： An echo canceller provided with an expected echo generating unit (101), which generates an ex- p.ected echo of a transmission signal, and a frequency offset correction unit (75) which detects a phase error between an echo in a received signal and an expected echo from the expected echo generating unit (101) and corrects the frequency offset for the expected echo by an offset frequency estimate based on the phase error, wherein use is made of the expected echo after offset correction by the frequency offset correction unit (75) so as to suppress the echo in the received signal, the frequency offset correction unit (75) using the phase error obtained after normalizing the phase error by )the magnitude of the echo in the received signal. By this, it is possible to perform frequency offset correction adaptive to the far-end echo characteristics. Further, it is desirable to perform the frequency offset correction after it is confirmed that the rate of change of the output from a subtractor for cancellation of the near-end echo has become almost zero.

    摘要翻译： 设置有产生发送信号的预期回波的预期回波产生单元（101）的回波消除器以及检测接收信号中的回波与预期回波之间的相位误差的频率偏移校正单元（75） 预期回波发生单元（101），并且基于相位误差校正预期回波的频率偏移量，其中使用由偏移校正单元（75）进行偏移校正之后的预期回波，以便 使用在相位误差标准化之后获得的相位误差乘以接收信号中的回波幅度来抑制接收信号中的回波。 由此，可以进行适应于远端回波特性的频偏校正。 此外，在确认用于消除近端回波的减法器的输出的变化率变得几乎为零之后，期望进行频率偏移校正。