A low-band spectrum envelope modeling for high quality pitch modification

Ryo Mochizuki, Tetsunori Kobayashi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    A low-band spectrum envelope reconstruction method was tested to see if it could improve the sound quality of speech modified by the PSOLA(Pitch Synchronous OverLap Add) method. In the conventional TD(Time Domain)-PSOLA method, the spectrum envelope extracted using a Hanning window with a two-pitch-period length had no reliable information in the band of frequencies lower than original F 0. This problem causes the sound degradation of the F 0 modified speech. In the proposed method, the low-band spectrum envelope was properly modified according to the F 0 modification rate. The amplitude of the F 0 harmonic components in the low-band was reproduced based on the spectral tilt of the spectrum envelope. Subjective listening test results suggest this proposed method yields better sound quality than the conventional TD-PSOLA method when the downward modification rate exceeds 0.4 octave.

    Original languageEnglish
    Title of host publicationICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
    Volume1
    Publication statusPublished - 2004
    EventProceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing - Montreal, Que, Canada
    Duration: 2004 May 172004 May 21

    Other

    OtherProceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing
    CountryCanada
    CityMontreal, Que
    Period04/5/1704/5/21

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    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Signal Processing
    • Acoustics and Ultrasonics

    Cite this

    Mochizuki, R., & Kobayashi, T. (2004). A low-band spectrum envelope modeling for high quality pitch modification. In ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings (Vol. 1)