A Low-Band Spectrum Envelope Reconstruction Method for PSOLA-Based F_0 Modification(Speech and Hearing)

概要

論文の詳細を見る
A low-band spectrum envelope reconstruction method was tested to see if it could improve the sound quality of F_0 modified speech with the PSOLA (Pitch Synchronous OverLap Add) method. In the conventional PSOLA method, the extracted spectrum envelope using a Manning window with two-pitch-period length had no reliable information in the band of frequencies lower than the original F_0. This problem causes sound degradation of the F_0 modified speech when the F_0 is shifted downward. 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 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.
社団法人電子情報通信学会の論文
2004-10-01