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Author:Airaksinen, Manu
Title:Analysis/Synthesis Comparison of Vocoders Utilized in Statistical Parametric Speech Synthesis
Tilastollisessa parametrisessa puhesynteesissä käytettyjen vokooderien analyysi-synteesi-vertailu
Publication type:Master's thesis
Publication year:2012
Pages:[8] + 103 s. + liitt. 10      Language:   eng
Department/School:Signaalinkäsittelyn ja akustiikan laitos
Main subject:Akustiikka ja äänenkäsittelytekniikka   (S-89)
Supervisor:Alku, Paavo
Instructor:Raitio, Tuomo
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201305163102
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Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  655   | Archive
Keywords:vocoder
speech synthesis
vocoder parametrization
analysis/synthesis
statistical distribution
vokooderi
puhesynteesi
HMM
vokooderiparametri
analyysi-synteesi
tilastollinen jakauma
GlottHMM
STRAIGHT
HSM
Abstract (eng): This thesis presents a literature study followed by an experimental part on the state-of-the-art vocoders utilized in statistical parametric speech synthesis.
In the experimental part, the analysis/synthesis properties of three selected vocoders (GlottHMM, STRAIGHT and Harmonic/Stochastic Model) are examined.
The performed tests were the analysis of vocoder parameter distributions, statistical testing on the effect of emotions to the vocoder parameter distributions, and a subjective listening test evaluating the vocoders' relative analysis/synthesis quality.

The results indicate that the STRAIGHT vocoder has the most Gaussian parameter distributions and most robust synthesis quality, whereas the GlottHMM vocoder has the most emotion sensitive parameters and best but unreliable synthesis quality.
The HSM vocoder's LSF parameters were found to be more Gaussian than the GlottHMM vocoder's LSF parameters.
HSM was found to be sensitive to noise, and it scored the lowest score on the subjective listening test.
Abstract (fin): Tässä työssä esitetään kirjallisuuskatsaus ja kokeellinen osio tilastollisessa parametrisessa puhesynteesissä käytetyistä vokoodereista.
Kokeellisessa osassa kolmen valitun vokooderin (GlottHMM, STRAIGHT ja Harmonic/Stochastic Model) analyysi-synteesi -ominaisuuksia tarkastellaan usealla tavalla.
Suoritetut kokeet olivat vokooderiparametrien tilastollisten jakaumien analysointi, puheen tunnetilan tilastollinen vaikutus vokooderiparametrien jakaumiin sekä subjektiivinen kuuntelukoe jolla mitattiin vokooderien suhteellista analyysi-synteesi -laatua.

Tulokset osoittavat että STRAIGHT-vokooderi omaa eniten Gaussiset parametrijakaumat ja tasaisimman synteesilaadun.
GlottHMM-vokooderin parametrit osoittivat suurinta herkkyyttä puheen tunnetilan funktiona ja vokooderi sai parhaan, mutta laadultaan vaihtelevan kuuntelukoetuloksen.
HSM-vokooderin LSF-parametrien havaittiin olevan Gaussisempia kuin GlottHMM-vokooderin LSF parametrit, mutta vokooderin havaittiin kärsivän kohinaherkkyydestä, ja se sai huonoimman kuuntelukoetuloksen.
ED:2012-12-17
INSSI record number: 45710
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