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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of sleepiness in the voice on speaker recognition performance
    Autorzy:
    Staroniewicz, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2146628.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    speaker recognition
    sleepiness
    rozpoznawanie mówcy
    senność
    Opis:
    The issue of the influence of speaker state on voice recognition has been analysed mainly in relation to forensics and biometric security systems. Sleepiness in the voice is a rather under-researched problem, and the few works in this area focus almost exclusively on the recognition of sleepiness rather than on its influence on the change of the speaker's voice characteristics. This paper discusses the issue of the influence of the speaker's state on voice recognition, describes the acquisition method of the acoustic database of voice drowsiness recordings used in the tests. It also discusses the subjective sleepiness scales used in the study and presents the results of the influence of sleepiness on the effectiveness of automatic speaker recognition based on a classical system using the Mel-Frequency Cepstral Coefficients parameterisation and the Gaussian Mixture Models classification.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021214
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical directivity simulations of speaker arrays for omnidirectional sound source quality assessment
    Autorzy:
    Chojnacki, Bartłomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/2146663.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    directivity assessment
    speaker design
    ISO 354
    ISO 3382
    szacowanie kierunkowości
    projekt głośnika
    Opis:
    Omnidirectional sound sources are standard devices used in numerous acoustic measurements, such as the ones described in ISO3382, ISO140, or ISO354 standards. They are used when information on the sound diffraction at an object is required. State of the art findings describe several engineering designs of omnidirectional sound sources; some commercial applications can be also found. However, there is no universal design method for this kind of sound sources, neither in terms of the size and number of the transducers nor any general electroacoustic principles. This paper describes the use of Finite Elements Method (FEM) to derive the directivity patterns of different speaker arrays, such as spherical speaker arrays and the most popular polyhedrons. The number of transducers studied in the paper varies from 4 to 36. The influence of transducer size and the enclosure size was also preliminarily investigated. The simulation results were assessed with new strict omnidirectionality quality measures, and the influence of the transducers' number or size on a final omnidirectional sound source performance was verified.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 1; art. no. 2022101
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Voice pathology assessment using x-vectors approach
    Autorzy:
    Kotarba, Katarzyna
    Kotarba, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2146638.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    x-vectors
    speaker embeddings
    voice pathology
    MFCC
    GFCC
    x wektory
    osadzenie głośnika
    patologia głosu
    Opis:
    Voice pathology assessment using sustained vowels has proven to be effective and reliable. However, only a few studies regarding detection of pathological speech based on continuous speech are available. In this study we evaluate the usefulness of various regression models trained on continuous speech recordings from Saarbruecken Voice Database in the detection of voice pathologies. The recordings were used for extraction of speaker embeddings called x-vectors based on mel-frequency cepstral coefficients and gammatone frequency cepstral coefficients. Since the dataset used in this study is imbalanced, various over- and undersampling techniques were applied to the training set to ensure robustness of models’ decision boundaries. The models were trained on both imbalanced and resampled training sets using 5-fold cross-validation. The best results were obtained for Multi Layer Perceptron trained on GFCC-based x-vectors, achieving accuracy of 0.8184, F1-score of 0.8212, and ROC AUC score of 0.8810 for the testing set.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 1; art. no. 2021108
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled speakers directivity measurements for small acoustic omnidirectional source development
    Autorzy:
    Chojnacki, Bartłomiej
    Kamisiński, Tadeusz
    Juros, Klara
    Kaczor, Daniel
    Powiązania:
    https://bibliotekanauki.pl/articles/127736.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    omnidirectional
    point sound sources
    coupled speaker set
    sound radiation patterns
    źródła dźwięku punktowego
    zestaw głośników
    wzorce radiacji dźwięków
    Opis:
    Acoustic monopole construction is unsolved task, which engineers try to solve for many years. In the past they constructed many innovative solutions, such as spark or laser-gap sound sources, but those concepts caused many equipment troubles. It is impossible to select type of the measurements signal for this kind of sound sources, also any sparks and laser beams can provide strong electromagnetic distortions around the operation zone. In current state of art we are trying to provide non-standard solutions while traditional omnidirectional sound source, based on spatial configuration of electroacoustic transducers, is not described correctly and can be expanded. Paper presents concept of acoustic monopole source based on coupled configuration for electrodynamic loudspeakers, similar to isobaric setup but non-constant volume between the speakers. By using FEM modelling we will present directivity patterns and project ideas, describing how overall results corresponds with geometrical parameters of speaker configuration and parameters. Presentation summary contain results of prototype device directivity patterns measurements. Received characteristics shows big potential in using cone-to-cone coupled speaker setup to reach acoustic monopole in frequency range defined by distance between transducers. Achieved knowledge allows to provide broadband, easy to build and small acoustic monopole with many possible applications.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 1; 1-6
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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