Filter Banks VIs

LabVIEW 2014 Advanced Signal Processing Toolkit Help

Edition Date: June 2014

Part Number: 372656C-01

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Owning Palette: Discrete Wavelet VIs

Requires: Advanced Signal Processing Toolkit. This topic might not match its corresponding palette in LabVIEW depending on your operating system, licensed product(s), and target.

Use the Filter Banks VIs to apply a two-channel filter bank to compute single-level discrete wavelet transform or synthesis, to compute the mother wavelet function and the scaling function from the filter bank, and to get the coefficients of the analysis filters and the synthesis filters for a predefined wavelet.

The VIs on this palette can return general LabVIEW error codes or specific Wavelet Analysis error codes.

Palette ObjectDescription
WA Analysis Filter BankComputes the single-level discrete wavelet transform (DWT) using a two-channel analysis filter bank. This VI decomposes the signal into the low-frequency subband (approx coef) and the high-frequency subband (detail coef). Both subbands have half the sampling rate of signal. Wire data to the signal input to determine the polymorphic instance to use or manually select the instance.
WA Mother Wavelet and Scaling FunctionComputes the mother wavelet function and the scaling function from a filter bank.
WA Synthesis Filter BankComputes the single-level inverse discrete wavelet transform (DWT) using a two-channel synthesis filter bank. This VI reconstructs the original signal with the low-frequency subband (approx coef) and the high-frequency subband (detail coef). Wire data to the approx coef or the DWT coef input to determine the polymorphic instance to use or manually select the instance.
WA Wavelet FilterProvides the coefficients of the analysis filters and the synthesis filters for some commonly used wavelets or reads the analysis filters and the synthesis filters from a text file. The predefined wavelets include orthogonal wavelets (Haar, Daubechies, Coiflets, Symmlets) and biorthogonal wavelets (Biorthogonal, including FBI).

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