Pitch shifting apparatus

Details Pitch shifting apparatus Pitch shifting apparatus

2007-04-25

2009-02-10

McFadden, Susan (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

07490035

ABSTRACT:
A pitch shifting apparatus detects peak spectra P1and P2from amplitude spectra of inputs sound. The pitch shifting apparatus compresses or expands an amplitude spectrum distribution AM1in a first frequency region A1including a first frequency f1of the peak spectrum P1using a pitch shift ratio which keeps its shape to obtain an amplitude spectrum distribution AM10for a pitch-shifted first frequency region A10. The pitch shifting apparatus similarly compresses or expands an amplitude spectrum distribution AM2adjacent to the peak spectrum P2to obtain an amplitude spectrum distribution AM20. The pitch shifting apparatus performs pitch shifting by compressing or expanding amplitude spectra in an intermediate frequency region A3between the peak spectra P1and P2at a given pitch shift ratio in response to the each amplitude spectrum.

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Tsuyoshi Mekata et al., “Hochoki eno Oyo o Koryo Shita Formant Kyocho Hoho no Kento”, The Acoustical Society of Japan (ASJ), Heisei 5 Nendo Shunki Kenkyu Happyokai Koen Ronbunshu, -I-, Mar. 17, 1993, pp. 285 and 286.
Jean Laroche et al., “New Phase-Vocoder Techniquest for Pitch-Shifting, Harmonizing and Other Exotic Effects”, Proc. 1999 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, New Paltz, New York, Oct. 17-20, 1999, pp. 91-94.

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