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Using the Viterbi Algorithm for Error Correction in an Autocorrelation-Based Pitch Detector

Abstract - An autocorrelation based method for detecting the fundamental pitch of an audio signal is presented in which the Viterbi algorithm is used in the error correction portion of the detector. The Viterbi algorithm is used to locate the maximum likely pitch path through the audio file. This method is compared to a typical heuristic and median filtering based error correction approach that has been historically used when detecting pitch through the use of autocorrelation. The Viterbi algorithm results are significantly better than the typical error correction methods for choosing the best and most plausible path through the pitch estimates.

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