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Custom Wavelet Analysis Using Signal Processing Toolkit in LabVIEW

Primary Software: LabVIEW Development Systems>>LabVIEW Full Development System
Primary Software Version: 7.1
Primary Software Fixed Version: N/A
Secondary Software: LabVIEW Toolkits>>Advanced Signal Processing Toolset, LabVIEW Development Systems>>LabVIEW Professional Development System

Problem: I would like to take a continuous wavelet transform of a wavelet of my own design. How would I do this in LabVIEW?

Solution:

The Continuous Wavelet Transform Ex.vi, a function available through the LabVIEW Signal Processing Toolkit, currently offers the Mexican Hat, Meyr, and Morlet wavelets as options for the wavelet input. There is also the option to choose "From Analysis Filter," which refers to the Wavelet Filter.vi. The Wavelet Filter.vi will generate analysis and synthesis wavelet coefficients that can be wired to the Continuous Wavelet Transform. The analysis lowpass, G0[i], highpass, G1[i], synthesis lowpass, H0[i], and highpass H1[i] are all outputs of the Wavelet Filter.vi. The wavelet input to the Wavelet Filter.vi gives access to all the wavelets that ship with LabVIEW (Bior1_3, Coif1, Db01, etc.).

These wavelet definitions are tab-deliminated text files. Each distinct line in the text file represents a different grouping of filter coefficients: one line for G0[i], one for G1[i], etc. In order to do a custom wavelet, the coefficients would need to be calculated and written to a text file in the aforementioned format. This wavelet could then be processed using the Wavelet Filter and Continuous Wavelet Transform.



Note: In the Advanced Signal Processing Toolkit versions 7.5 and later, you can use the Wavelet Design Express VI to design customized wavelets.



Related Links: Products & Services: NI LabVIEW Advanced Signal Processing Toolkit National Instruments LabVIEW Support Homepage

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Report Date: 03/12/2004
Last Updated: 06/30/2009
Document ID: 37B9QVWX

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