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Analog to digital conversion - sample rate
I've been trying to stay out of the conversation, but I do want to clear
a few things. I would like to point out that this topic is the subject of
an entire college. So, it is very difficult to simplify it down to just a
couple of paragraphs. Let me hit the highlights.
A/D converters don't see the signal as a set of sine waves.
we look at signals as a set of sine waves because it allows us create a
system of mathematics that does a very good job of describing filters both
analog and digital. You could create a system of mathematics based of
different frequency square waves, but sine waves result in much simpler
The Nyquist rate is a theoretical concept that results from the
mathematics and it indicates to us the maximum frequency that can be
represented after sampling a signal. As has been stated, it is necessary
to filter a signal before sampling to avoid significant frequency content
about the Nyquist rate. The topic of filters is a huge one.
Higher sampling rates are better, but twice the sampling rate doesn't mean
that your sound will be twice as good. It is a very interesting topic and
for those of your interested in it, I highly recommend that you take
courses or do some experimentation. It is a fun topic to explore.