What voice qualities do intonations include?

Intonation includes the voice quality known as pitch variation, which refers to the changes in pitch that occur during speech, specifically the rise or fall of vocal frequency. Intonation also involves the voice qualities of prosody and speaking rate.

Prosody refers to the characteristics of speech that go beyond individual words, such as rhythm, stress, and intonation.

Speaking rate refers to the speed at which a person speaks.

These features of voice create a melody to the speech, adding emotional nuance and meaning to spoken language.