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Acoustic Noise Control Device

The circuit described here is used to control the acoustic noise levels produced in a room or office. The main idea behind installing the device is that it employs asks human speech to request the people making noise to be quiet. The circuit is quite complex because the device reacts not only to a certain instantaneous noise level but on its duration as well. For example, the device will ignore coughing and sneezing noises. However, if someone sneezes too often and too loud the device will react with an appropriate warning message.
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