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slembcke/pitch.rb

Created June 12, 2012 14:58
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Overly simplistic pitch detection
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pitch.rb
SAMPLE_RATE = 44100
DURATION = 2
def tone(freq, phase, t)
Math.sin(t*freq*2.0*Math::PI + phase)
end
sum = 0.0;
(DURATION*SAMPLE_RATE).to_i.times{|sample|
t = sample/Float(SAMPLE_RATE)
sum += tone(440, 0.0, t)*tone(440, 0.0, t)
}
puts sum*(0.5*DURATION/SAMPLE_RATE)
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