A low-band spectrum envelope reconstruction method for PSOLA-based F 0 modification

Ryo Mochizuki*, Tetsunori Kobayashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A low-band spectrum envelope reconstruction method was tested to see if it could improve the sound quality of F0 modified speech with the PSOLA (Pitch Synchronous Overlap Add) method. In the conventional PSOLA method, the extracted spectrum envelope using a Hanning window with two-pitch-period length had no reliable information in the band of frequencies lower than the original F0. This problem causes sound degradation of the F0 modified speech when the F0 is shifted downward. 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 were reproduced based on the spectral tilt of the spectrum envelope. Subjective listening tests suggest the proposed method yields improved sound quality than the conventional TD-PSOLA method when the downward modification rate exceeds 0.4 octave.

Original languageEnglish
Pages (from-to)2426-2429
Number of pages4
JournalIEICE Transactions on Information and Systems
Issue number10
Publication statusPublished - 2004 Oct


  • F modification
  • Spectrum envelope
  • Speech synthesis

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering
  • Artificial Intelligence


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