To process images, a computer assigns red, green and blue values to every pixel. How does a computer manage sound? What are the values assigned?
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May be you are asking how does the computer make the wave pressure on the air? There is a electro magnet on the speaker that get activated with the electric signal sent by the computer, this magnet is attached to a membrane, this membrane will move back and forward when the magnet is activated generating the pressure waves they are speaking about. The more frequent the electric signal the more amount of waves pressure per time on the air and higher the pitch you hear.
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