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

Ryo Mochizuki; Tetsunori Kobayashi

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

Ryo Mochizuki^*, Tetsunori Kobayashi

^*Corresponding author for this work

School of Fundamental Science and Engineering

Research output: Contribution to journal › Conference article › peer-review

3 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 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 language	English
Pages (from-to)	I645-I648
Journal	ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Volume	1
Publication status	Published - 2004
Event	Proceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing - Montreal, Que, Canada Duration: 2004 May 17 → 2004 May 21

ASJC Scopus subject areas

Software
Signal Processing
Electrical and Electronic Engineering

Cite this

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title = "A low-band spectrum envelope modeling for high quality pitch modification",

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 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.",

author = "Ryo Mochizuki and Tetsunori Kobayashi",

year = "2004",

language = "English",

volume = "1",

pages = "I645--I648",

journal = "Proceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing",

issn = "0736-7791",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

note = "Proceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing ; Conference date: 17-05-2004 Through 21-05-2004",

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T1 - A low-band spectrum envelope modeling for high quality pitch modification

AU - Mochizuki, Ryo

AU - Kobayashi, Tetsunori

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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.

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M3 - Conference article

AN - SCOPUS:4544232303

SN - 0736-7791

VL - 1

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JO - Proceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing

JF - Proceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing

T2 - Proceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing

Y2 - 17 May 2004 through 21 May 2004

ER -

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

Abstract

ASJC Scopus subject areas

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