Extending the sawtooth wave form inspired pitch estimator with an auditory-based preprocessing stage.
Arturo Camacho · The Journal of the Acoustical Society of America · 2009
The sawtooth wave form inspired pitch estimator (SWIPE) [A. Camacho, J. Acoust. Soc. Am. 124, 1638–1652 (2008)] is extended by introducing an auditory-based preprocessing stage consisting of two main steps. First, a system consisting of a gammatone filterbank followed by half-wave rectifiers and low-pass filters is applied to the signal. This system tends to boost low-order harmonics of the signal, as shown in a work by Klapuri [A. Klapuri, IEEE Trans. Audio, Speech, Lang. Process. 16, 255–266 (2008)]. Second, the square root of the amplitude spectrum is computed on every channel, and they are summed to form a summary square-root spectrum (SSRS). SWIPE is then applied to this SSRS. Results show that the proposed method significantly outperforms the original SWIPE on music and telephonelike speech, albeit producing a small decrease in performance on high-fidelity speech.