音频滤波

大部分内置滤波器可直接支持对音频信号的滤波.

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a = ExampleData[{"Audio", "Apollo11SmallStep"}, "Audio"]

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低通滤波器.

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lp = LowpassFilter[a, Quantity[800, "Hz"], 101]

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高通滤波器.

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hp = HighpassFilter[a, Quantity[1600, "Hz"], 101]

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Periodogram[{a, lp, hp}, 2000, PlotRange -> {{0, 3000}, Automatic}, Frame -> True, ImageSize -> Medium, PlotLegends -> {"Original", "Lowpass", "Highpass"}]

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用维纳滤波器移除杂音.

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WienerFilter[a, 25]

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