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    Wyświetlanie 1-4 z 4
    Tytuł:
    Subjective Assessment of the Speech Signal Quality Broadcasted by Local Digital Radio in Selected Locations in Wroclaw under Studio and Home Conditions
    Autorzy:
    Brachmański, Stefan
    Kin, Maurycy
    Zemankiewicz, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/2200727.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Digital Audio Broadcasting
    speech quality
    quality assessment
    Opis:
    In October 2018, local digital radio was launched to cover the agglomeration of Wroclaw. The implementation of this undertaking required many tests, including qualitative ones, that refer to both music and speech. This paper presents the results of subjective tests based on the evaluation of speech quality of signals recorded at various points in Wroclaw. Measurements were carried out in accordance with the recommendations of the International Telecommunication Union as well as in ordinary acoustic conditions in listeners’ flats. The rating was made for male and female voices. The most important conclusion is that for speech signal assessment in meaning of the quality the test conditions do not influence the obtained results. The other fact confirmed in the experiment was that the receiving place of DAB+ signal in the Single-Frequency Network also does not affect the perceived voice quality.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 687--693
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quality Assessment of Musical and Speech Signals Broadcasted via Single Frequency Network DAB+
    Autorzy:
    Kin, Maurycy
    Brachmański, Stefan
    Powiązania:
    https://bibliotekanauki.pl/articles/226936.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quality evaluation
    digital broadcasting
    single frequency network
    speech quality
    music quality
    Opis:
    Paper presents the results of quality assessment of speech and music signals transmitted via DAB+ system with the use of Single Frequency Network (SFN). The musical signals were evaluated in overall quality domain. The subjective research was provided with the use of Absolute Category Rating procedure according to the ITU recommendation and the results have been presented as the MOS values for various bit rates. The speech signals were additionally examined with PESQ method. The results have shown that the assumed quality of 4 MOS, for this kind of broadcasting could be achieved at 48 kb/s for speech and 64 kb/s for music. This fact was confirmed by both: subjective and objective research. The comparison between the results obtained for SFN broadcasting with three emitters with single-emitter broadcast was presented.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 139-144
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deep Neural Network for Supervised Single-Channel Speech Enhancement
    Autorzy:
    Saleem, Nasir
    Irfan Khattak, Muhammad
    Ali, Muhammad Yousaf
    Shafi, Muhammad
    Powiązania:
    https://bibliotekanauki.pl/articles/177497.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    deep neural network
    intelligibility
    speech enhancement
    speech quality
    supervised learning
    Wiener filtering
    Opis:
    Speech enhancement is fundamental for various real time speech applications and it is a challenging task in the case of a single channel because practically only one data channel is available. We have proposed a supervised single channel speech enhancement algorithm in this paper based on a deep neural network (DNN) and less aggressive Wiener filtering as additional DNN layer. During the training stage the network learns and predicts the magnitude spectrums of the clean and noise signals from input noisy speech acoustic features. Relative spectral transform-perceptual linear prediction (RASTA-PLP) is used in the proposed method to extract the acoustic features at the frame level. Autoregressive moving average (ARMA) filter is applied to smooth the temporal curves of extracted features. The trained network predicts the coefficients to construct a ratio mask based on mean square error (MSE) objective cost function. The less aggressive Wiener filter is placed as an additional layer on the top of a DNN to produce an enhanced magnitude spectrum. Finally, the noisy speech phase is used to reconstruct the enhanced speech. The experimental results demonstrate that the proposed DNN framework with less aggressive Wiener filtering outperforms the competing speech enhancement methods in terms of the speech quality and intelligibility.
    Źródło:
    Archives of Acoustics; 2019, 44, 1; 3-12
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of the level of noise and echo on the reaction time of listeners in the perception of logatoms
    Autorzy:
    Brachmański, Stefan
    Dobrucki, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2146651.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    perception
    listener’s time reaction
    speech quality
    percepcja
    czas reakcji słuchacza
    jakość mowy
    Opis:
    The article presents the results of research regarding the impact of the degree of distortion and noise of the logatom (nonsense word) on the listener's reaction time. The study aimed to determine the maximum reaction time of listeners, which will allow determining the time after which the logatom will be exposed in the speech quality assessment method with an alternative choice. The research was carried out with the participation of a group of ten students. A strong relationship between the results obtained and the concentration of the listeners was found, as well as the effect of fatigue, training, and the gender of the listener. The obtained results indicate that in the method with an alternative choice before the logatom emission should appear 1.1 s initial sequence, which will eliminate the situation when the listeners did not recognize the initial phoneme transmitted from the logatom.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021215
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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