Where is the baseband information stored if it isn't
encoded into the sampling?

"Hal Murray" wrote in message
...
So, if I have a signal with a 1000 hz carrier, with
a bandwidth of 50 hz,
you think I can sample it at just 150 hz and get
accurate reproduction?
That's just wrong.

No, that's the whole point of this discussion.

You have to understand aliasing. The signal you want
aliases
down into the baseband. Your anti-aliaising filter
has
to get rid of all the junk you don't want. In this
case it
includes the baseband. Since there is no baseband
signal
(or other out-of-band junk) you can reconstruct the
original
signal.

It's a common trick with software radios.

You do need some extra information that doesn't go in
through
the A/D channel. That's the design of the system, in
particular
what the anti-aliasing filter lets through.

Maybe the reason that this is so confusing is that
you also need
that info the the normal/baseband case. But since
that's the normal
case we don't bother mentioning it.

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