OPP: DSP (Digital Signal Processing)

What a wonderful resource for Arduino signal processing:

http://coolarduino.wordpress.com

I found this post very useful when I was learning how to send various audio signals in to the Arduino (see Arduino Audio Input Module):

http://coolarduino.wordpress.com/2012/06/22/audio-input-to-arduino/

One of his projects is a musical note recognition device.  I wonder if it could be used to transcribe simple songs, like old arcade game soundtracks and the like.

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