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The ultimate goal is to build a real-time guitar tuner that operates on sound waves picked up through microphones. At the heart of most guitar tuners is some sort of pitch detection algorithm. This post will focus on exploring 3 of those algorithms - zero-crossing, fast fourier transform, and autocorrelation. We will only be concerned with a six-string, standard-tuned guitar. The western musical system has 12 notes, which are along the top row. The frequency of each octave is double the frequency of the previous octave.
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