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

Ryo Mochizuki*, Tetsunori Kobayashi

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


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 F0. This problem causes the sound degradation of the F0 modified speech. In the proposed method, the low-band spectrum envelope was properly modified according to the F0 modification rate. The amplitude of the F0 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
Pages (from-to)I645-I648
JournalICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Publication statusPublished - 2004
EventProceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing - Montreal, Que, Canada
Duration: 2004 May 172004 May 21

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering


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