> so bare with me.

Um, that could get me arrested, at least if we do it in public.

> Since human speech usually is below 4000 hz, the minimum sample rate I
> would need is 8,000 samples per second. Since the signal itself's
> highest frequency should be around 4000 hz, a 12 bit resolution (4096
> possible values) should work. Is this correct?

The signal frequency has nothing to do with the A/D resolution.  Yes, you
need to sample at 8KHz minimum.  And this assumes a very sharp external
filter that cuts off at 4KHz.  It may be easier to sample a bit faster, like
16KHz for example, then do software low pass filtering to get the 8KHz
samples.

In either case, you don't need 12 bit resolution if you just want to get
voice from here to there.  Voice will be quite understandable at 10 bit
resolution.

> I have been looking at the PIC16C77X MCUs.. I was also looking at the
> PDF datasheet at:

I would stay away from those PICs.  They useful when you really need 12 bit
A/D resolution and therefore have to put up with all the other stuff to get
it.  10 bit A/D is a lot easier and gives you a much wider choice of PICs.


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