A Low-Band Spectrum Envelope Reconstruction Method for PSOLA-Based F0 Modification
Summary :
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.
- Publication
- IEICE TRANSACTIONS on Information Vol.E87-D No.10 pp.2426-2429
- Publication Date
- 2004/10/01
- Publicized
- Online ISSN
- DOI
- Type of Manuscript
- LETTER
- Category
- Speech and Hearing
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Ryo MOCHIZUKI, Tetsunori KOBAYASHI, "A Low-Band Spectrum Envelope Reconstruction Method for PSOLA-Based F0 Modification" in IEICE TRANSACTIONS on Information,
vol. E87-D, no. 10, pp. 2426-2429, October 2004, doi: .
Abstract: 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.
URL: https://global.ieice.org/en_transactions/information/10.1587/e87-d_10_2426/_p
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@ARTICLE{e87-d_10_2426,
author={Ryo MOCHIZUKI, Tetsunori KOBAYASHI, },
journal={IEICE TRANSACTIONS on Information},
title={A Low-Band Spectrum Envelope Reconstruction Method for PSOLA-Based F0 Modification},
year={2004},
volume={E87-D},
number={10},
pages={2426-2429},
abstract={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.},
keywords={},
doi={},
ISSN={},
month={October},}
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TY - JOUR
TI - A Low-Band Spectrum Envelope Reconstruction Method for PSOLA-Based F0 Modification
T2 - IEICE TRANSACTIONS on Information
SP - 2426
EP - 2429
AU - Ryo MOCHIZUKI
AU - Tetsunori KOBAYASHI
PY - 2004
DO -
JO - IEICE TRANSACTIONS on Information
SN -
VL - E87-D
IS - 10
JA - IEICE TRANSACTIONS on Information
Y1 - October 2004
AB - 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.
ER -
English
