Please help me!! Asking about Real-valued continuous wavelet transform and Complex-valued continuous wavelet transform

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Supatat Hovanotayan
Supatat Hovanotayan on 31 Jul 2019
Hi Everyone!!
My name is Supatat, Now I am doing research about detecting aburpt transition of roll angular velocity of rail vehicle using continuous wavelet transform.
I have used MATLAB2014 and MATLAB2019 to perform continuous wavelet transform. The difference between 2014 and 2019 version is the wavelet coefficient. MATLAB2014 version returns real-valued wavelet coefficient while 2019 version returns complex-valued wavelet coefficient.
This is the analyzed roll angular velocity signal
This is the continuous wavelet transform result form MATLAB2014[using morlet wavelet 'morl']
old.jpg
This is the continuous wavelet transform result form MATLAB2019[using morlet wavelet 'amor']
new.jpg
Form the results above, For 2014 version, we can see that the maximum wavelet coefficient is located at low frequency area[around 1-2Hz]. However, for 2019 version, the maximum one is located at around 10~20Hz. And the order of coefficient are also different.
I don't understand why I got different results (because of the difference between 2 versions as I mentioned?)
Moreover, which result is correct? Could anyone please answer my all questions ?
Thank you very much in advance for your help

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