A pitch determination algorithm based on subharmonic-to-harmonic ratio

In the present paper, a pitch determination algorithm (PDA) based on Subharmonic-to-Harmonic Ratio (SHR) is proposed. The algorithm is motivated by the results of a recent study on the perceived pitch of alternate pulse cycles in speech [1]. The algorithm employs a logarithmic frequency scale and a spectrum shifting technique to obtain the amplitude summation of harmonics and subharmonics, respectively. Through comparing the amplitude ratio of subharmonics and harmonics with the pitch perception results, the pitch of normal speech as well as speech with alternate pulse cycles (APC) can be determined. . Evaluation of the algorithm is performed on CSTR’s database and on synthesized speech with APC. The results show that this algorithm is one of the most reliable PDAs. Furthermore, superior to most other algorithms, it handles subharmonics reasonably well.

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