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The Continuous Wavelet Transform

Module by: Aniruddha Sen. E-mail the author

The Continuous Wavelet Transform allows us to see the correlation of all the different lengths wavelets to the signal itself in the time domain. Use the cwt command in Matlab to obtain the transform. What is interesting about this transform, unlike the Fourier transform, is that it allows one to see breaks within the original signal and the exact position of those breaks as seen in the following figure.

Figure 1: Notice the definite break in the middle of the sine wave.
Sine Wave with Break
A sine wave with a break

We can now use this wavelet transform on other non-periodic signals to get a more detailed response from the Fourier Transform.

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