wavelet transfer function analysis

[Prof_Dee]

Has anyone implemented a transfer function analysis using wavelets?

By analogy awavelet power spectrum can be defined as the wavelet transformation of its autocorrelation function.

Similarly it should be possible to calculate a cross-wavelet transformof two time series and a cross-wavelet coherence.

Can this be doen using LabVIEW?

[niarena]

Hi Prof Dee,  you can do it with the Advanced Signal Processing Toolkit

Check this intro to the wavelet processing:

https://zone.ni.com/reference/en-XX/help/371419D-01/lvasptconcepts/wa_intro/

[niarena]

look at this

https://zone.ni.com/reference/en-XX/help/371419D-01/lvwavelettk/wa_discrete_wavelet_transform/

[Prof_Dee]

Thanks for your replies. I think I need to supply more details of the problem.

I am looking to find Gain, Phase and Coherence to test the relations between a stimulus and response as is done in the waveform measurements frequency response function.

[niarena]

I found a forum where they use Labview with a Matlab script for the coherence analysis, check it out

http://forums.ni.com/t5/LabVIEW/Can-Labview-perform-wavelet-coherence/m-p/1881209#M635706

[niarena]

Also chekc the helpme file for the WA Configure Scalogram Indicator VI

Displays the square magnitude or the phase of the wavelet coefficients on an intensity graph.

https://zone.ni.com/reference/en-XX/help/371419D-01/lvwavelettk/wa_plot_scalogram/

[Prof_Dee]

Thanks for these suggestions.  I have reached the conclusion that LabVIEW is not capable of Wavelet Transfer Function Analaysis whereas MatLab is.  I don't have Matlab, so will have to wait until National Instruments expands the wavelet function in LabVIEW to match those in Matlab (if ever).