Digital subscriber line modem utilizing echo cancellation to reduce near-end cross-talk noise
    5.
    发明授权
    Digital subscriber line modem utilizing echo cancellation to reduce near-end cross-talk noise 失效
    数字用户线调制解调器利用回波消除来减少近端串扰噪声

    公开(公告)号:US06263077B1

    公开(公告)日:2001-07-17

    申请号:US09028141

    申请日:1998-02-23

    IPC分类号: H04B320

    摘要: A digital subscriber line communication system does not require the use of a plain old telephone service (POTS) splitter in the resident's home. Digital signal-processing techniques are utilized to accommodate varying subscriber line conditions coming from POTS telephone equipment. The digital signal-processing techniques eliminate the need for a splitter by reducing susceptibility to distortion resulting from varying subscriber line characteristics. The digital subscriber line modem can utilize quadrature amplitude modulated (QAM) signals and frequency division multiplexing. The digital subscriber line modem includes a control circuit that implements an echo canceler and an analyzer to reduce near-end cross-talk noise. The analyzer performs spectral analysis to preemphasize or to predistort the transmitted signals in accordance with the cross-talk noise.

    摘要翻译: 数字用户线路通信系统不需要在居民的家中使用普通老式电话服务(POTS)分离器。 利用数字信号处理技术来适应来自POTS电话设备的不同用户线路状况。 数字信号处理技术通过减少由于不同的用户线路特性导致的失真的敏感性,消除了对分路器的需要。 数字用户线路调制解调器可以利用正交幅度调制(QAM)信号和频分复用。 数字用户线路调制解调器包括实现回波消除器的控制电路和分析器,以减少近端串扰噪声。 分析仪执行频谱分析,以根据串扰噪声预加重或预失真发送的信号。