Thread: What is the best way to detect a particular frequency,and sound an alarm when it is detected?

i just asked this question.but i wanted to elaborate a bit.
if i use an EEG output,is it possible to identify the occurrence of a particular frequency.if possible how do i do that.

EEG output -> Matlab Real Time Fast Fourier Transforms -> Frequency Spectrum

Investigate this option.

use a bandpass filter, then send output to a comparator, if the output exceeds some threshold, trigger a one shot.