Digital matched filter system and its realization are discussed. Two problems about digital matched filter realization and digital spectrum of signal are analyzed.

论述了数字匹配滤波系统及其实现，讨论了采用数字方法在频域实现匹配滤波的信号处理系统中，匹配滤波器实现中的两个实际问题。

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Then digital matched filter (DMF), which is used to synchronize spread spectrum code, especially the multi-rate sampling in DMF is studied.

然后探讨了用于扩频码同步的数字匹配滤波器（DMF），着重分析了DMF的多倍码速率采样问题；

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Phase-matched filter is applied to extract phase of fundamental surface wave, and then time-variable filter is used to correct amplitude spectrum in order to isolate fundamental mode signs.

使用相匹配滤波技术提取基阶面波振型的相位，然后再利用时变滤波进行振幅谱校正，以此分离出基阶振型面波信号。

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This produces a characteristic wiggle on a graph, a so-called power spectrum, which can then be matched against theoretical expectation.

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