Knock Sensor Filtering
 

I'm looking to use the stock knock sensor on my 2000. I've read that the stock knock circuit on the DIYPNP is fairly primitive. It can receive the signal, however it has no way of filtering the noise that is characteristic of the Miata's engine and thus becomes useless above 3k RPM.
Could I run the sensor input through the DB connector and into an arduino for filtering? The only tricky part would be is figuring out what filtering needs to happen exactly.
Thoughts?

The Arduino can't filter the knock signal. It lacks the DSP and raw processing power to do it in realtime.

i am also curious. I use to have a megasquirt KnockSense, but i could not get it working above 3000rpm before it read everything as Knock... While tuning i just used homemade Detination headphones to detect it.
but really, im looking for a more automated way to know when knock is happening