Flip your chart program over and take a look at a weekly chart, and pull back and look at a weekly across three years or five years.

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By analyzing the distance between points on the CAPTCHA's distorted pitch chart and the pitch charts of possible answers to the puzzle, his program was able to remove the noise and "listen" to the file just as accurately as a human.

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Brooks demonstrated a program he'd written that guesses the audio file's contents, overlaying those guesses on the pitch level chart of the noisy audio file.

FORBES: Magazine Article