Hi all,

What algorithms/filters/whatever would I start looking into to use a
microcontroller/FPGA/digital ICs/analog components to detect the frequency
of a single audio source such a as an electric guitar input? I don't really
even need the actual frequency number, I just somehow need to convert the
input wave into a square wave/pulse that can be used to pulse an LED, for
example.

I used my oscilloscope to look at the signal generated by the guitar, and
it's pretty clean, but it:

1. doesn't look exactly like a sin wave
2. decreases in amplitude over time (and becomes almost exactly like a
sawtooth wave at low amplitudes)

How would I go about extracting the frequency out of this, or getting a
clean pulse corresponding to the frequency (like a square wave, or
whatever)?
--=20
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