On Sat, Apr 7, 2012 at 7:36 PM, Sergey Dryga <sergey@dryga.us> wrote:

>  Getting a clean pulse: use comparator, it will give you a clean digital
> signal.
> It's possible to use a comparator in a PIC and do processing using the
> same PIC.
>
> Extracting frequency is more problematic, but can be done in e.g. dsPIC, =
as
> others suggested.  If you need to detect a specific frequency, LM565
> phase-locked loop is good for audio frequencies.
>


I was thinking about the comparator, but since the amplitude of the signal
gradually falls over a period of a few seconds, how would I constantly
follow and update the cutoff?
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.