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B) Energy spectra corresponding to the wavelets in (a) all have identical energy and hence the same area under their curves. Note that only the positive part of the energy spectrum is shown. negative parts of the signal are reasonably coincidental with those of the wavelet. 15. 15. At location b3, the signal and the wavelet are essentially out of phase which results in a large negative value returned for T(a,b). At location b4, the wavelet and the signal are again out of phase, similar to location b3.

27c. These are located using arrows at the top of the phase plot. 27d. 27 Segment of a chirp signal with associated transform plots – the Morlet wavelet: (a) Chirp signal segment. (b) Real part of the Morlet wavelet transform. (c) Phase. (d) Modulus. 2 (e) A schematic of the ridge found from the maxima of the rescaled scalogram T (a, b) /a . The instantaneous frequency at time bR can be found from aR. 13, and using a Morlet wavelet. Then, using a change of variable t′ = (t − b)/a, it can be shown that maxima in the rescaled scalogram correspond to the instantaneous frequencies through their associated scales.

Hence, T(a,b) tends to zero as the dilation a tends to zero width. 15. Thus, when the wavelet function is either very small or very large compared with the signal features the transform gives near zero values. Continuous wavelet transforms are not usually computed at arbitrary dilations and isolated locations but rather over a continuous range of a and b. 7 where the Mexican hat wavelet has been used. This plot of T(a,b) against a and b is known as a wavelet transform plot. 7c). 7 Wavelet transform plots of a sinusoidal waveform: (a) Five cycles of a sinusoid of period p.

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