Visualization of phase characteristics of a vocal tract using phase-conversion method with electroglottograph signals

Okada, Masahiro

doi:10.1250/ast.42.150

Cited by 1 publication

(3 citation statements)

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“…We explain the principle of calculating phase spectrograms and why phase rotations disappear in the phase spectrograms using EGG signals [15].…”

Section: Principle Of Phase Spectrogram Calculationmentioning

confidence: 99%

“…Participants uttered these sentences after 50 ATR sentences in the above order. more evident than that of females [15]. The participants uttered 54 Japanese sentences comprising 50 sentences in subset A of ATR phonetically balanced sentences [20] and four additional sentences (Table 2) that are often used in Japanese phonetic studies.…”

Section: /Papamomamamo Minnade Mamemakio Cita/mentioning

confidence: 99%

“…In a previous study, we proposed phase spectrograms [15], which allow us to observe the phase characteristics of the vocal tract filter in the time-frequency domain similar to power spectrograms [ϕ(t, ω) in Figure 1]. The phase spectrograms are calculated by subtracting the phase in the time-frequency domain of electroglottograph (EGG) signal from that of speech.…”

Section: Introductionmentioning

confidence: 99%

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Phase characteristics of vocal tract filter can distinguish speakers

Okada,

Ito

2023

Front. Appl. Math. Stat.

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IntroductionSpeaker recognition has been performed by considering individual variations in the power spectrograms of speech, which reflect the resonance phenomena in the speaker's vocal tract filter. In recent years, phase-based features have been used for speaker recognition. However, the phase-based features are not in a raw form of the phase but are crafted by humans, suggesting that the role of the raw phase is less interpretable. This study used phase spectrograms, which are calculated by subtracting the phase in the time-frequency domain of the electroglottograph signal from that of speech. The phase spectrograms represent the non-modified phase characteristics of the vocal tract filter.MethodsThe phase spectrograms were obtained from five Japanese participants. Phase spectrograms corresponding to vowels, called phase spectra, were then extracted and circular-averaged for each vowel. The speakers were determined based on the degree of similarity of the averaged spectra.ResultsThe accuracy of discriminating speakers using the averaged phase spectra was observed to be high although speakers were discriminated using only phase information without power. In particular, the averaged phase spectra showed different shapes for different speakers, resulting in the similarity between the different speaker spectrum pairs being lower. Therefore, the speakers were distinguished by using phase spectra.DiscussionThis predominance of phase spectra suggested that the phase characteristics of the vocal tract filter reflect the individuality of speakers.

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“…We explain the principle of calculating phase spectrograms and why phase rotations disappear in the phase spectrograms using EGG signals [15].…”

Section: Principle Of Phase Spectrogram Calculationmentioning

confidence: 99%

Section: /Papamomamamo Minnade Mamemakio Cita/mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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