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Most
recording that is done today uses analog microphones (transducers)
that convert the mechanical energy of sound into an electrical
signal whose voltage varies by the strength of the sound
as it vibrates the diaphragm of the microphone. If this
varying voltage is to be recorded on a digital medium, its
variations
must be converted to a binary digital code. This is accomplished
using an analog to digital converter (or A/D converter).
This converter samples the signal at designated intervals
(thousands of times per second) and quantizes the sample
into the binary code.
The process, then, looks like this.
Eventually the digital code has to be
converted back to analog form, since we live in an analog
world and the code must become mechancial energy again where
sound pressure that will vibrate our eardrums can be recreated
by speakers. So this has to happen using a digital to analong
(D/A) converter.
And then:
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