Knock Detection

[Robert Harris]

Course you could simply take the knock sensor output, condition it, 16 bit A/d 
it once only and apply the signal to a DSP running a modest program and get any 
output you want.  Simple ass PC hams take wide spectrum HF audio, put it into a 
SB16 card, run a program on the PC and clean it up so only the desired signal 
is present.  Stand alone units are from 100 to 300 bucks, and they recover a 
lot better signal in a lot more crap.  Join the 21st century - use a simple DSP 
and KISS.
Just my usual overbearing obnoxious 2 bucks worth - your mileage may vary.

If the first ingredient ain't Habanero, then the rest don't matter.
Other Obsessions: Ferro-Equinary , 1972 "Killer Whale" Mustang
Currently Interred in the Peoples Democratic Republic of California - Stalag 
Montclair
Puck da guns - ban Politicians!!!!!
Robert Harris <bob at bobthecomputerguy.com>


-----Original Message-----
From:	Eric Ekberg [SMTP:etekberg at ou.edu]
Sent:	Thursday, November 06, 1997 10:18 AM
To:	diy_efi at coulomb.eng.ohio-state.edu
Subject:	Re: Knock Detection

> In fact, I think it would be an excellent project to build a circuit that
> has 16 a/d lines connected to 16 24d/b octave bandpass filters, which in
> turn connect to the same knock sensor.  One can then use a microprocessor
> with the 16 a/d lines built in (or added, doesn't matter) to read the
> frequency spectrum of the knock sounds, and make necessary adjustments to
> timing, fuel, spark voltage, or what have you.

16 atod converters?? That would be a huge waste of resources.