Hi John,
The DSP is audio. Its got a sharper cutoff but can be affected by the AGC
which is also audio. The crystals filters FL1 -FL4 are IF and closer to the
front end and cut interference before the AGC.
Yes, in non critical situations, the DSP filters are sharper, but if a loud
adjacent
While a still wet behind the ears student several hundred years ago, a
professor told me that The best filters for any receiver are at the
antenna terminals, before any RF enters the receiver. Once you let it
in, it's hard to control. Unfortunately, filters are a bit hard to
implement that
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