If you want to solve his original problem, detecting treble and bass energy in an audio signal, you might want to read up on the Goertzel algorithm. http://en.w

If you want to solve his original problem, detecting treble and bass energy in an audio signal, you might want to read up on the Goertzel algorithm. http://en.wikipedia.org/wiki/Goertzel_algorithm http://en.wikipedia.org/wiki/Goertzel_algorithm For limited numbers of bands it will use less battery power and be faster.