Just a thought.

[Peter Skinner]

     Is it possible to have a band pass filter act as a lp or hp filter.  
I was thinking I could drop the input signal frequency, run it through 
the filter, the raise it back up the same amount.  This would be the low 
pass.  Has this been done, or is it too far off-base?
Maybe the filter would not be able to span the entire Freq range.
Any thoughts?  Thanks.

PS

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