To make sound-system media {records}, microphones can detect sound and make voltage changes that cause a pointed needle to vibrate sideways and cut a plastic disc {recording music}. Plastic discs are soft wax-like material and turn like a record as needle vibrates. Signals can make larger groove widths for high frequencies and smaller groove widths for low frequencies. Machine uses plastic disc to make a metal mold {master}. A press pushes soft vinyl into mold to make a disc.
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7-Machine-Kinds-Electronic-Sound
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Date Modified: 2022.0224