![]() ![]() ![]() A raspy sound like a washing machine or a librarian going "shhhh" will be a very complex wave. We can record that electrical representation of sound to a magnetic tape or a vinyl record, or we can take samples of it tens of thousands of times per second, and record and playback those samples using a computer.Īudio, whether it's sound in the air, or electricity down a wire, can be represented as a wave, with the amplitude of the wave representing how loud it is - how big the vibration is - and the frequency of the wave representing its pitch - whether it's a low thud or hum, or something in the middle like someone saying "ah", or something very high like hissing.Ī very pure sound like from a flute or a tuning fork will look like a pure sine wave. We can also make a microphone in a similar way: its vibration against the permanent magnet, picked up from the vibration of the surround air, causes the electromagnet to move, which creates electricity. This is a speaker: it causes the air around it to vibrate. We can use an electromagnet to create sound from electricity: by placing a coil of wire near a permanent magnet, attaching a paper cone to it, and then turning electricity to it off and on very quickly. That vibration causes the surrounding air to vibrate: sound! Much like our larynx can create sound by creating vibrations, our ears can pick up those vibrations. Audio, or sound, is a variation of air pressure, caused by the vibration of an object, like vocal cords or a guitar string or a hammer hitting a nail. ![]()
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