Dayton Audio OmniMic V2 Precision Measurement System User Manual
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Wavelet Spectrogram
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shows a combined time/frequency representation of the impulse response. The Wavelet
Spectrogram in OmniMic uses a very fast algorithm that allows the display to occur in real time. In all time/frequency
displays there is a mathematical "uncertainty principle" which limits the degree of time resolution that can be obtained for
a given frequency resolution, and vice versa. In other words, the more detailed the time character of the display, the less
detailed will be the frequency character. The Wavelet Spectrogram shows the optimized presentation, giving as much
combined resolution as possible. The horizontal axis is time, the vertical axis is frequency, and color shows the relative
intensity (in dB). You can select the octave resolution, in a control below the plot, to determine the desired resolution
tradeoff. An ideal wavelet spectrogram (flat response, no resonances or reflections) will look like a vertical tapered horn,
like this: