Sound Detection (3.5kHz signal)

... the RoboAudioStix [...] provides a /dev/dsp device that provides data from line in on the board. We can perform a Fast Fourier Transform and check the power bands, or we can use Goertzel's algorithm (essentially a DFT for a few frequencies). Or, since we're starting much earlier this year, we should have plenty of time to implement both... Goertzel's is really fast. Oh, just found another one we could try out -- the Chirp-Z Transform (CZT).

Brian Davidson, 6.30.06