I am working on ECG signal processing with wavelet transform. I want to add two different wavelet coefficients from two different levels. But as their length is not same so how can I add them? Can I use wprcoef (Matlab) command to get approximation value of these two coefficients and add them ?
Rakshit,
You can add wavelet coefficients from two different levels of the signal if the wavelet transform is undecimated. For a decimated WT, the wavelet coefficients can be added from different levels after interpolation operation in order to get the same sized subbands.
Regards,
Sumaiya.
Like Sumaiya, I assume you used a decimated DWT; if it is the case, you can't simply "add", but you have to use a reconstruction algorithm, with an interpolation operation (inserting 0 and filtering basically).
Dear Rakshit
You can add by interpolation in decimated wavelet decomposition and without in undecimated wavelet but the question is why are you doing it. Different level coefficients are having different characteristics such as bandwidth and center frequency. The coefficients are having parent-child relation and can be used to get transition behavior and other property of the signal. So first it is based on application and coefficients behavior.
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