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## [Tftb-help] achieving the power spectrum by integration of the WVD

 From: Hallgrímur Th . Björnsson Subject: [Tftb-help] achieving the power spectrum by integration of the WVD Date: Mon, 30 Jul 2007 14:22:55 +0200

 Hello there.   I‘m trying to achieve the power spectrum by integrating the TFR obtained from using the WVD of  the toolbox. In my understanding, I should approximately arrive at a similar conclusion as using the fft. The problem is that, when plotting the resulting value from the integration, there seems to have been a frequency shift by 2 * f. So, if I have a sinusoid of frequency 50Hz, the spectrum by integrating the WVD shows a 100Hz component. I have tried to use the CWD also, and the same problem is also in that case.   Here is my Matlab code:   close all clear t=linspace(0,1,1000); f1=50; figure x=sin(2*pi*f1*t); subplot(2,1,1) plot(abs(fft(x)))   [TFR,T,F]=tfrwv(x);   intg=integ(TFR); subplot(2,1,2)   plot(intg)   Can anyone help?   Thanks

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