paralanguage

n. non verbal vocal features that accompany speech in order to communicate specific meanings

Paralanguage refers to the non-verbal elements of communication used to modify meaning and convey emotion. Paralanguage may be expressed consciously or unconsciously, and it includes the pitch, volume, and, in some cases, intonation of speech. Sometimes the definition is restricted to vocally-produced sounds. The study of paralanguage is known as paralinguistics.
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Noun
1. the use of manner of speaking to communicate particular meanings
(synonym) paralinguistic communication
(hypernym) communication
(part-meronym) manner of speaking, speech, delivery