[BC] IBOC All-digital MW receivers can easily handle analog AM.

[Dan Strassberg]

Phil Alexander wrote the following nonsense for what must be the hundredth
time:

Try it this way. Broadcast receivers are about the only analog electronic
equipment left, and in a few years analog electronic manufacture will be
history.

----

Phil, you MUST realize that building an "all-digital" receiver to receive
amplitude-modulated MW broadcasts has to be one of the SIMPLEST conceivable
applications of DSP. The sampling and ADC problems are well within the state
of the art and you can go straight from RF to baseband with no IF (in the
traditional sense) by intentionally undersampling the modulated RF carrier.
Moreover, at higher frequencies, the "all-digital" receivers of which you so
often speak are mostly NOT all digital. Most of them--even those that
receive "digital" modulation, such as n-QAM (which is as much analog as it
is digital)--convert from the carrier frequency to the IF in the analog
domain. The reason for staying in the analog domain to implement so much of
the receiver's block diagram is NOT the analog nature of digital modulation,
however. The reason is that today, and for years to come, the sampling and
A/D conversion problems are and will be much more straightforward and the
solutions much more cost effective when implemented at a modest intermediate
frequency. So the reason you keep trotting out for analog receiver
technology just having to go holds no water and never did. Have you been
taking lessons from the folks in DC on how to make a point? From where I
sit, it seems like it. I can't believe that you aren't fully aware that the
line you have been spouting here and elsewhere for so long is and always has
been flat-out just not so..

--
Dan Strassberg, dan.strassberg at att.net
eFax 707-215-6367