Hi In Matlab I can calculated the the Spectrogram of an Audio signal with the Short Time Fourier Transformation which uses the the Discrete Fourier Transformation (FFT). I can do the same thing using the Wavelet Transformation by using in Matlab the continuous wavelet Transformation CWT and display me a Scalogram. Which gets explained here http://kelvinchufei.blogspot.com/2008/01/wavelet-scalogram-using-complex-morlet.html" [Broken] But this is very slow. How can I do this with the discrete Wavelet Transformation. Should I not get an equal result, since the discrete FT in the STFT gives me also a good result. I tried to use the "wavedec" function by splitting up the Signals into frames in the same way the STFT gets calutated But the result comes not even close to the image I get with the cwt. Is it because of the scaling Interval of 2^x for the DWT?