Table 2 Extraction procedure of the acoustic parameters
From: Vocal usage learning and vocal comprehension learning in harbor seals
Parameter | Definition |
|---|---|
Duration (s) | Temporal interval from the start to the end of the vocalization. |
Spectral center of gravity (Hz) | The weighted average frequency of the vocalization’s spectrum. The spectrum was calculated with Praat’s “Sound: To Spectrum” (default parameters). Then, the center of gravity was calculated using “Spectrum: Get center of gravity” (default parameters). |
Percentage voiced (%) | The pitch was calculated with Praat’s “Sound: To Pitch” (default parameters, except for pitch_floor = 50, pitch_ceiling = 400). The number of voiced frames was divided by the number of all frames. |
Median harmonicity (dB) | Harmonicity was calculated with Praat’s “Sound: To Harmonicity (cc)” (default parameters, except for minimum_pitch = 50). After this the median of the harmonicity values were calculated. |
Dominant frequency (Hz) | The spectrum was calculated with Praat’s “Sound: To Spectrum” (default parameters). Then, we selected the frequency bin with the highest power. |