Chapter | two
From Acoustic Sound to Electrical Signals
CHAPTER OUTLINE
In order to be able to measure, manipulate, or describe sound, we generally have to convert it from an acoustic to an electrical signal.
Sound exists in purely acoustical terms as pressure variations in the air. By using an appropriate transducer, for example a microphone, these pressure variations can be transformed into variations in current or voltage.
If we wish to record the sound, we then have to convert these electrical variations into another form. In the past these variations were widely used to leave magnetic traces on an audio tape or physical variations in the surface of a vinyl record. Today we mostly convert the sound ...
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