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What are supra segmental sound?

Johnny NY: What are supra segmental sound?

The term suprasegmental refers to properties of an utterance that apply to groups of segments, rather than to individual segments. For example,stressis generally assigned to a syllable rather than to an individual sound. The three main suprasegmental features are stress, intonation, and tone.
Stress- Emphasis, conveyed through differences in pitch, loudness, or duration, that distinguishes a stress-bearing untion (often a syllable) from neighboring units. In some languages (not English), stress is contrastive (i.e. stress alone can distinguish between two otherwise identical words). An English word with initial stress isescapade. An English word with final stress isunderstand.
Intonation- THe pattern of rising and falling pitch over an utterance. In English, rising pitch is often used to indicate a question ("Mary likes John?", while falling pitch is usually characteristic of a declarative sentence ("Mary likes John.".
Tone- The use of pitch on a sequence of sounds to convey lexical information. In English, tone is not contrastive, but it many languages it is. For example, in Mandarin Chinese, the same syllable has four different meanings, depending on which tone is used.
http://hmongrp.wisc.edu/hmong/help/definitions4.html