The results are shown below. Most interesting is to watch the noise in the time-frequency (scale) domain move towards the low-frequency end of the images (the bottom of the images). The CWTs maintain information about individual disturbances at all scales and times; compare to the Digital Spectrum Analyzer results, which are time-averaged spectra rather than time-resolved as realized in the CWTs.
Animated loop of all Continuous Wavelet Transform spectra images. (322 KB)
Time to download
14.4 kbps: 3 m 57 s;
28.8 kbps: 1 m 58 s;
56 kbps: 1m 01 s;
and ISDN: 27 s.
Kasdin, N.J. and Walter, T. (1992), "Discrete Simulation of Power Law
Noise," in Proceedings of the 1992 IEEE Frequency Control Symposium, pp. 274-283.
----- (1998), Wavelet Toolware Version 1.0, software.