Continuous Wavelet Transform
cwt = CWT(x,nvoice,wavelet,oct,scale)
signal, dyadic length n=2^J, real-valued
number of voices/octave
string 'Gauss', 'DerGauss','Sombrero', 'Morlet'
Default=2
Default=4
matrix n by nscale where nscale = nvoice .* noctave