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filterbank

Full-weight CWT filter bank for deep learning

Since R2022b

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    Syntax

    psif = filterbank(clayer)

    Description

    example

    psif = filterbank(clayer) returns the full-weight continuous wavelet transform (CWT) filter bank for the cwtLayer, clayer.

    Examples

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    Open Live Script

    Create a cwtLayer for a signal of length 2048 samples. Specify the analytic Morlet wavelet.

    clayer = cwtLayer(SignalLength=2048,Wavelet="amor");

    Obtain the full-weight CWT filter bank of the layer.

    psif = filterbank(clayer);

    Plot the filter bank.

    slen = clayer.SignalLength;
f = 0:1/slen:1-1/slen;
plot(f,psif')
xlim([0 1/2])
xlabel("Cycles/Sample")
ylabel("Magnitude")
title("Full-Weight Filter Bank")

    Figure contains an axes object. The axes object with title Full-Weight Filter Bank, xlabel Cycles/Sample, ylabel Magnitude contains 82 objects of type line.

    Create a CWT filter bank. Specify the same wavelet and signal length you used to create the CWT layer. Obtain the two-sided frequency responses of the wavelet filters in the filter bank. Compare with the full-weight CWT filter bank.

    fb = cwtfilterbank(SignalLength=2048,Wavelet="amor", ...
    Boundary="periodic");
psidft = freqz(fb,FrequencyRange="twosided");
max(abs(psidft(:)-psif(:)))
    ans = single
    5.9544e-08

    Input Arguments

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    CWT layer, specified as a cwtLayer object.

    Output Arguments

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    Full-weight CWT filter bank, returned as a matrix.

    Data Types: double

    Version History

    Introduced in R2022b

    See Also

    Functions

    Objects