Amplitude

Amplitude

Formal definition: Amplitude in units Decibels is calculated as where Pf is the power at any one frequency and were baseline is (arbitrarily) set to 70dB as a default.

Fig 1: Equation of Amplitude

Amplitude is measured in dB scale, but note that the power is un-scaled, hence the baseline is arbitrary. You can adjust the baseline value in options->feature calculation->amplitude baseline. SAPII uses amplitude as one of the criteria for segmenting syllables and adjustments are based on relative values (namely, you adjust the amplitude slider to be slightly above the cage noise observed in the spectral image). Other than that, however, amplitude is not used for any other procedure.

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