A short demo program Kevin Banks wrote to enable you to test-drive the Goertzel algorithm. This is Listing 1 in Kevin Banks' “The Goertzel Algorithm,” first printed in September 2002 issue of Embedded Systems Programming magazine. The article describes the Goertzel algorithm, which can perform tone detection using much less CPU horsepower than the Fast Fourier Transform.
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Where is it?
Its here:
https://github.com/pramasoul/jrand/blob/master/goertzel.c