Class D power amplifier---what about class-D CD?
Why would you want it to represent a number? This is a bit like
reading a voltage with an A/D, then instantly converting it back
to a voltage (with steps) to record it onto e.g. vinyl. The intervening
digital stage has been pointless.
Because if it represents a specific number, then it's much easier to read
its intended value -- because you have a priori information about the nature
of the signal. This is one of the ways digital transmission reduces the
effects of noise (both amplitude and phase).
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