Reference pulse, how to extract it?

I need your help, any suggestion swill be appreciate.

The problem: I need to find a way to extract the reference pulse from a
engine timing wheel. I do not know what is the simples way to proceed. More
info:

The engine use a timing wheel with 36 even space teeth with a 37e teeth
squeeze between two others that is the reference pulse (the zero). I engine
use a variable reluctance pickup to read the pulse.

I used a LM1815 to get the obtain a clean pulse from that sensor, it work
fine.

Now, I need to find a way to extract the 37e pulses from the other to
generate a reference pulse. So I will end up with one single pulse by wheel
turn.

How I do that?


Jacques St-Pierre


.

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