梳状滤波

为梳状滤波器定义一个离散传递函数.

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combFilterModel[f_, \[Alpha]_, sr_: 44100] := TransferFunctionModel[{{1/( 1 - \[Alpha] z^-Round[sr/f])}}, z, SamplingPeriod -> 1/sr]

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combFilterModel[300, \[Alpha]]

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用 BodePlot 绘制传递函数图形.

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BodePlot[combFilterModel[300, -.9], {0, 20000}, ScalingFunctions -> {"Linear", Automatic}, PlotLayout -> "Magnitude", ImageSize -> Medium]

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用 RecurrenceFilter 对音频对象滤波.

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a = AudioNormalize[Import["ExampleData/rule30.wav"]]

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RecurrenceFilter[combFilterModel[300, -.9], a]

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