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    • 4. 发明授权
    • Echo canceller
    • 回音消除器
    • US5528687A
    • 1996-06-18
    • US201336
    • 1994-02-24
    • Yoshinori TanakaShigeyuki UnagamiMasayoshi Inoue
    • Yoshinori TanakaShigeyuki UnagamiMasayoshi Inoue
    • H04B3/23H04B3/20
    • H04B3/232H04B3/237H04B3/238
    • An echo canceller provided with an expected echo generating unit which generates an expected echo of a transmission signal and a frequency offset correction unit which detects a phase error between an echo in a received signal and an expected echo from the expected echo generating unit and corrects the frequency offset for the expected echo by an offset frequency estimated based on the phase error, wherein use is made of the expected echo after offset correction by the frequency offset correction unit so as to suppress the echo in the received signal, the frequency offset correction unit 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.
    • 一种回波消除器,其具有生成发送信号的预期回波的预期回波发生单元和检测接收信号中的回波与来自预期回波发生单元的期望回波之间的相位误差的频偏校正单元, 通过基于相位误差估计出的偏移频率的期望回波的频率偏移,其中使用由偏移校正单元进行偏移校正之后的预期回波,以抑制接收信号中的回波,频率偏移校正单元 使用在相位误差归一化接收信号中的回波幅度之后获得的相位误差。 由此,可以进行适应于远端回波特性的频偏校正。 此外,期望在确认用于消除近端回波的减法器的输出的变化率已经变为几乎为零之后执行频率偏移校正。
    • 5. 发明授权
    • Automatic equalization device and method of starting-up the same
    • 自动均衡装置及其启动方法
    • US4571733A
    • 1986-02-18
    • US527573
    • 1983-08-17
    • Takashi KakuShigeyuki UnagamiMasayoshi Inoue
    • Takashi KakuShigeyuki UnagamiMasayoshi Inoue
    • H04B3/10H04L25/03H04B3/06
    • H04L25/03133
    • An automatic equalization device used in a data communication system includes a unit for extracting a single pulse from a training signal sent from a transmitter and initializing a tap coefficient using the extracted single pulse. The automatic equalization device also includes a first equalization circuit and a second equalization circuit. In the first equalization circuit, an auto-correlation series of the signal corresponding to the single pulse is calculated to provide a symmetric single pulse. In the second equalization circuit, an inverse matrix is calculated from the symmetric single pulse using the auto-correlational series of single pulses. By these calculations, the speed of the initial setting of the tap coefficient is increased.
    • PCT No.PCT / JP82 / 00479 Sec。 371日期1983年8月17日 102(e)日期1983年8月17日PCT申请日1982年12月28日PCT公布。 公开号WO83 / 02373 日期:1983年7月7日。在数据通信系统中使用的自动均衡装置包括用于从发送器发送的训练信号中提取单个脉冲并使用提取的单个脉冲初始化抽头系数的单元。 自动均衡装置还包括第一均衡电路和第二均衡电路。 在第一均衡电路中,计算与单个脉冲对应的信号的自相关序列,以提供对称的单个脉冲。 在第二均衡电路中,使用单个脉冲的自相关系列从对称单脉冲计算逆矩阵。 通过这些计算,抽头系数的初始设定的速度增加。