Wavelet scale error.

Hi all
I am trying to denoise an ECG signal using discrete wavelet transform. i have done a VI for this purpose . but when wiring the ECG signal to the input of the attached VI it gives an error ( the wavelet scale must be greater than zero ).
can you guys have a look at my VI and see what is wrong with it ?
thank you .
Bill David
Attachments:
ECG Data Denoise.vi ‏217 KB
ECG Data Denoise.vi ‏217 KB

Dear Bill!
That is quite a loaded question. Filter design is a whole science by itself, and I don't believe that a non-trivial solution exists in your case.
What is my desired noise-to signal ratio? What manner of noise do I have? What is an acceptable degradation of signal accuracy (peaks and transients)?
These are all questions that you most consider, and then shoot for an optimal compromise.
I would say the easiest solution would be to try and set different thresholds, manual settings and constants, and check the output signal to see what works best for you. Also, keep in mind that the main advantage of wavelet filters is that the can keep sharp edges and transitions while maintaining good noise reduction. Because of this special treatment of meaningful edges, noise that is next to an edge will not be filtered well.
You can even use more then one filter to target specific frequency areas and problems.
Please check this whitepaper for more details of ECG signal filtering. There is also quite exellent academic literature on tre subject, for instance here or here.
Kind regards:
Andrew Valko
National Instruments AE
Andrew Valko
National Instruments Hungary

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