Sound Detection

This section is for information regarding detection of 3.5 kHz sound used for robot activation.

Update: 1.17.06 by Mark C. A preliminary PSPICE diagram has been submitted. It has four sections: microphone amplifier, passive bandpass filter, charger, and comparator. Levi will put the diagram in the robotics lab. Anyone who wishes to review it may do so during the club meetings (if you don't have access to the lab.) It will need approval (functionality and cost) before it's prototyped.

Update 6.30.06 by Brian D. For the Blue Bot I'll be switching to the RoboAudioStix, which 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).