Correlation between mother wavelet and ECG signal

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remo
remo 2013-4-11
评论： debojit sharma 2023-5-16
Hi all,
I am doing wavelet denoising for my ECG signal. In order to choose best mother wavelet for my signal, i have to correlate it first with my input signal.
How can i correlate a mother wavelet and ECG signal in Matlab? I can correlate two ECG signals, but not a mother wavelet and a ECG signal.
This due to the fact that i cannot get mother wavelet in an array. All i get is "db4" or "db8" as a character. How can i get a mother wavelet into an array and correlate with my signal?
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remo
remo 2013-5-10
Hi Mr.Phani,
Thank you for your time in answering my question.
Now i am able to get Morlet wavelet in matlab. But, wavelet of interest to me is Db4,5,6 . I cannot get these wavelets since there are no builtin functions just like for Morlet wavelet.
ATHIRA
ATHIRA 2013-11-1
use wavefun in matlab.we will get both wavelet and scaling function.Then change the size of the wavelet function to match with the signal and then find out correlation

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Wayne King
Wayne King 2013-11-1
The results for wavelet denoising should not be that heavily dependent on the choice of wavelet.
For EEG data, I would recommend starting with one of Daubechies' least asymmetric wavelets with at least 4 vanishing moments, 'sym4' for example.
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debojit sharma
debojit sharma 2023-5-16
For time-frequency analysis, Can I use symlets wavelet family in CWT?
I mean if I use the in-built function of MatLab 'cwt' to find CWT coefficient of a signal as follows:
cfs=cwt(y,scales,'sym4','plot');
cfs=abs(cfs);
Is it valid to use symlet wavelet here for CWT? In earlier version of MatLab this was there.

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