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NOTIONS OF INTELLIGIBILITY
Intelligibility is the ability to understand speech under given conditions.
Of course, while there are situations where one wants good intelligibility (e.g., for the listener of a speaker in a conference hall or for a traveler attempting to listen to the PA system), there also are situations where one does not want to be disturbed by undue speech (e.g., in a open-plan office); there are even situations where one wants to make sure speech is not understood (e.g., in banks).
Several levels of understanding can be identified:
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