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Re: [Tftb-help] Urgent Help needed on wavelet (fwd)

From: Eric Chassande-Mottin
Subject: Re: [Tftb-help] Urgent Help needed on wavelet (fwd)
Date: Wed, 5 Sep 2007 10:23:28 +0200 (CEST)

Thanks for your prompt reply. I have some ideas on what you are talking about and I started agree with you. I have re-read the source that I have got, and I realise that the "tau" is defined as the time scale in his defintion, which I think is different than "a" in euqation 1 which equals to "fo/f" or "f/fo", and thus results a different multi-resolution features.

Ok, I understand your point, now. I was wrong yesterday when I said that tfrrmsc computes exactly W(tau,omega). tfrrmsc computes a time-scale
representation (t,a) like in the Eq (1) of your previous message.
you want a 1/scale-frequency representation.

I have tried to compute my work using tfrrmsc, and it results a good time resolution at high frequency region, and poor time resolution when frequency is low.

Another question is, is there anyway for me to compute the multi-resolution properties like what the paper describe? Do I need to go into the m file and change it?

yes, you'll have to. I would extract from tfrrmsc.m the part of the code which calculates tfr and adapt the loops so that you implement Eq (3).

W(tau,omega) = (tau^-0.5) x Integrate [f(t) x h(t/tau) x exp(j*omega*tau)] dt (3)


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