Magnitude and phase of the signal using cwt

12 次查看（过去 30 天）

Giovanni Pirro 2024-5-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2122996-magnitude-and-phase-of-the-signal-using-cwt

评论： Abhimenyu 2024-6-12

Hi,

I have a signal in time that I want to analize in the frequency domain using wavelet transform (to balance time and frequency resolution). When I check the magnitude scalogram that is automatically generated using the function cwt, the value of the magnitude that i read is somehow corresponding to the value I am expecting from the time signal. When I try to extract this values computing abs and angle of the coefficients I get from cwt and compare them with expected magnitude and phase, I see there is some scaling factor. I tried to play with the sampling frequency, and it seems to be dependent also on this, but I could not figure out looking into the documentation how to get rid of this scaling factor.

coefs = cwt(signal, scales, wavelet);

mag=abs(coefs);

ph=angle(coefs);

I am taking the magnitude and phase at the freqeuncy where I have the peak, of course, using max(). That's the one I want to extract.