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    Wyświetlanie 1-5 z 5
    Tytuł:
    Transfer Characteristics of Vocal Tract Closed by Mask Cavity
    Autorzy:
    Vojnović, M.
    Mijić, M.
    Šumarac Pavlović, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/177542.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mask
    transfer characteristics
    vocal tract
    Opis:
    This paper analyses the changes in transfer characteristics of the vocal tract when closed by a mask, i.e. a chamber. The analysis was performed in two ways: by analytical estimation and by measurements in the vocal tract physical model for the case of mask with inner volume V = 430 cm3, corresponding to the oxygen masks used in combat airplanes. It was shown that closing the vocal tract with a mask cavity increases the first formant frequency by about 10% in front and high vowels (/e/, /i/, and /u/) and the frequencies of the first two formants by about 5% in the remaining two vowels (/a/ and /o/). It was also revealed that longitudinal and transversal resonances in the mask chamber can lead to errors in the recognition of the vowel formant frequencies. The results point to the need for additional knowledge about resonances in mask application.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 307-311
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Overpressure Breathing on Vowel Formant Frequencies
    Autorzy:
    Vojnović, Milan
    Mijić, Miomir
    Šumarac Pavlović, Dragana
    Vojnović, Nebojša
    Powiązania:
    https://bibliotekanauki.pl/articles/1953505.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    mask
    overpressure
    transfer characteristic
    vocal tract
    Opis:
    Voice controlled management systems are based on speech recognition techniques. The use of such systems in combat aircraft is complex due to a number of critical factors which affect the accuracy of speech recognition, such as high level of ambient noise and vibration, use of oxygen masks, serious psycho-physical stress of speakers, etc. One of the specificity of the oxygen mask application is overpressure breathing. The results of the simulations presented in this paper show that the presence of overpressure on the order of 1000 Pa in the vocal tract has a significant influence on the first two formant frequencies. The formants discrimination field is significantly reduced when oxygen mask is used, influencing both perceptive and automatic discrimination of spoken vowels.
    Źródło:
    Archives of Acoustics; 2021, 46, 1; 177-181
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Real-Time Vocal Tract Model for Elongation of Segment Lengths in a Waveguide Model
    Autorzy:
    Qureshi, Tahir Mushtaq
    Ishaq, Muhammad
    Powiązania:
    https://bibliotekanauki.pl/articles/176990.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    digital waveguide
    vocal tract
    elongation of cylindrical segment
    Opis:
    A vocal tract model based on a digital waveguide is presented in which the vocal tract has been decomposed into uniform cylindrical segments of variable lengths. We present a model for the real-time numerical solution of the digital waveguide equations in a uniform tube with the temporally varying cross section. In the current work, the uniform cylindrical segments of the vocal tract may have their different lengths, the time taken by the sound wave to propagate through a cylindrical segment in an axial direction may not be an integer multiple of each other. In such a case, the delay in an axial direction is necessarily a fractional delay. For the approximation of fractional-delay filters, Lagrange interpolation is used in the current model. Variable length of the individual segment of the vocal tract enables the model to produce realistic results. These results are validated with accurate benchmark model. The proposed model has been devised to elongate or shorten any arbitrary cylindrical segment by a suitable scaling factor. This model has a single algorithm and there is no need to make section of segments for elongation or shortening of the intermediate segments. The proposed model is about 23% more efficient than the previous model.
    Źródło:
    Archives of Acoustics; 2019, 44, 2; 287-300
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Symmetric Approach in the Three-Dimensional Digital Waveguide Modeling of the Vocal Tract
    Autorzy:
    Mushtaq, Tahir
    Kamran, Ahmad
    Qureshi, Muhammad Zubair Akbar
    Iqbal, Zafar
    Powiązania:
    https://bibliotekanauki.pl/articles/31339832.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    symmetric
    digital waveguide
    vocal tract
    delay lines
    rectilinear uniform grid
    Opis:
    Simulation of wave propagation in the three-dimensional (3D) modeling of the vocal tract has shown significant promise for enhancing the accuracy of speech production. Recent 3D waveguide models of the vocal tract have been designed for better accuracy but require a lot of computational tasks. A high computational cost in these models leads to novel work in reducing the computational cost while retaining accuracy and performance. In the current work, we divide the geometry of the vocal tract into four equal symmetric parts with the introduction of two axial perpendicular planes, and the simulation is performed on only one part. A novel strategy is defined to implement symmetric conditions in the mesh. The complete standard 3D digital waveguide model is assumed as a benchmark model. The proposed model is compared with the benchmark model in terms of formant frequencies and efficiency. For the demonstration, the vowels /ɔ/, /i/, /ɛ/, /ɑ/, and /u/ have been selected for the simulations. According to the results, the benchmark and current models are nearly identical in terms of frequency profiles and formant frequencies. Still the current model is three times more effective than the benchmark model.
    Źródło:
    Archives of Acoustics; 2023, 48, 3; 317-324
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new elliptical model of the vocal tract
    Autorzy:
    Kobus, A.
    Kuniszyk-Jóźkowiak, W.
    Smołka, E.
    Suszyński, W.
    Codello, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/333373.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    model eliptyczny
    aparat głosowy
    przewidywania liniowe
    jąkanie
    elliptical model
    vocal tract
    PARCOR
    linear prediction
    disfluency
    stuttering
    Opis:
    In this paper a new model of the vocal tract is proposed. It is based on elliptical cylinders. It uses the vocal tract model based on PARCOR coefficients and midsaggital measurements of the voice tube. PARCOR coefficients were obtained from linear prediction coefficients which had been obtained by Levinson-Durbin method. Midsaggital lengths, understood as the height of a real vocal tract, were taken from X-Ray pictures, and they were averaged from the vocal tracts of a few people, who uttered the same vowels. The paper bases on Polish vowels: a,e,o,u,i,y.
    Źródło:
    Journal of Medical Informatics & Technologies; 2011, 17; 131-139
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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