The horizontal axis shows the frequencies in critical bands, from 1 to 20, the vertical axis shows the energy level in dB in the bands. A curve are fitted to the energy output of the filter. In every 10 ms new spectrum is measured and shown together with 9 earlier ones on the screen. On the computer screen the change of the energy of the spectral components in time is presented. The logarithmic energy output of the filters during the pronunciation of words, sentences are presented in 10 ms steps.
Light colours present the high energy level, the dark one the low energy levels.
Colours change in 6dB s steps. Phonemes with noise components are presented by yellow and read colours, vowels are presented by white and blue ones. In the case of the best fitting we compare the two spectrograms. White rectangles are drown where the difference is negative, and green when difference is positive. On the computer screen the energy levels of the spectral components are presented.