Now you have to provide samples ***AND*** changing
information with an algorthm to decode successfully.
Your samples are then not complete and useless without
other information supplied.

Superhetrodyning in a radio assumes a variable
superhetrodyning frequency when it gets decoded

Let's see you regenerate the original carrier and
information from that without the carrier frequency
known.

When you listen to the audio on your radio can you tell
the carrier frequency without the dial?

"Joel Kolstad" wrote in
message ...
Assuming all the "information" (the carrier and
whatever sideband(s) you care
about) is still within your bandpass frequencies,
you've lost nothing and
there is no aliasing with any non-zero signals.

Superheterodyning is still common to get the RF down
to an IF that can be
digitized directly. As Ray mentioned earlier, the
problem with trying to
digitize, say, a narrowband 900MHz signal using a
5Msps ADC is that the effect
of any clock jitter going into the ADC gets
multiplied by the 900/5, so at
some point obtaining a decent oscillator becomes
impractically expensive.

---Joel