49.
    发明专利
    未知

    公开(公告)号:DE69909292T2

    公开(公告)日:2004-04-22

    申请号:DE69909292

    申请日:1999-10-13

    Abstract: In a DMT telecommunciations transmission system having at least two VDSL systems, each comprising a pair of modems, and belonging to a single binder group common to both VDSL systems, a method is described for keeping DMT frames aligned to the same frame timing. In this way, orthogonality holds and adjacent carriers can be used for different transmission directions without an capacity loss due to NEXT cross-talk. The steps are: estimating the time mis-alignment and power of cross-talk DMT signals added to a received DMT signal. The estimate is used by the modem to synchronise its own frame timing to a main cross-talker's frame timing auto-correlation is used on the received signal and a delayed copy of the received signal correlation maxima determine the frame boundaries of different DMT components of the received signal.

    50.
    发明专利
    未知

    公开(公告)号:DE69910015D1

    公开(公告)日:2003-09-04

    申请号:DE69910015

    申请日:1999-05-11

    Abstract: A circuit, for digitizing an analogue signal includes an analogue to digital converter, a clip processor adapted to estimate a value for clipped digital signal samples, and a buffer adapted to dynamically store a plurality of digitized samples produced by the analogue to digital converter. The clip processor is adapted to read digitized samples from the buffer and replace clipped digitized samples with the estimated values, thereby mitigating the effects of clipping in an output of the circuit.

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