Affective prosody is quantified via F0, intensity, articulation rate, and spectral slope.

Evidence

As a measure of tempo, articulation rate was calculated by dividing the number of syllables in the canonical transcription of the utterance by the file length, excluding pauses longer than 100 ms. Spectral slope is reflected in the spectral information described by the Hammarberg Index (Hammarberg et al. 1980 ), which is defined as the intensity difference between the maximum intensity in a lower frequency band [0–2000 Hz] versus that in a higher frequency band [2000–5000 Hz]. — Dijk, Pim van, Physiology, Psychoacoustics and…, 1366

Categorization

• DEFINE: The Hammarberg Index is a precise operational definition for spectral slope/vocal effort in prosody analysis.