User`s manual

18.4.2 NORMALIZED SCALOGRAMS
The Scalogram is a colormap display of the magnitude square of the matrix of
Wavelet coefficients. It is possible to interpret every cell of the Scalogram as
proportional to the energy of the signal in a domain located around give time and
frequency points.
Due to the uncertainty in time, the energy content it is smeared in time and
somewhat difficult to interpret.
Figure 18.6 - Wavelet Analyisis of loudspeaker impulse response - Not normalized
If we are interested to the time-frequency energy decay of the system, the
normalized view is more clear. Since every frequency slice it is normalized to its
energy time maximum, the map can be loosely interpreted as the time-frequency
energy decay of the system. The red area is a clear view of the time response of
the system versus frequency and can be taught as an extension of the excess
phase group delay method shown on section 10.4.4.
224 18 WAVELET ANALYSIS