Looking around my classroom I hear lots of noises, mainly from students. A program could be developed which measures the ambient noise in the room. If the noise increases above a certain level then a 'Shhh' noise could be played, automatically hushing the students. If the ambient noise drops, then the 'Shhh' will turn off. If the noise continues then the 'Shhh' noise can raise in volume relative to the ambient noise until the level drops down. One can hope anyway!
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