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    Wyświetlanie 1-7 z 7
    Tytuł:
    The impact of muscle tone on the development of auditory perception – research orientation
    Autorzy:
    Pawlukowska, Wioletta
    Siwczak, Katarzyna
    Szylińska, Aleksandra
    Turoń, Agnieszka
    Rotter, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/552400.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
    Tematy:
    directional hearing, auditory perception, sound source localization, delayed motor development,
    proper motor development.
    Źródło:
    Family Medicine & Primary Care Review; 2017, 4; 382-386
    1734-3402
    Pojawia się w:
    Family Medicine & Primary Care Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Combination of Spectrum Subtraction and Cross-power Spectrum Phase Method for Time Delay Estimation
    Autorzy:
    Bin, Feng
    Lei, Xu
    Powiązania:
    https://bibliotekanauki.pl/articles/177562.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    sound source localization
    time delay estimation
    generalized cross correlation
    phase of cross power spectrum
    spectral subtraction
    Opis:
    In order to solve the problem of large error of delay estimation in low SNR environment, a new delay estimation method based on cross power spectral frequency domain weighting and spectrum subtraction is proposed. Through theoretical analysis and MATLAB simulation, among the four common weighting functions, it is proved that the cross-power spectral phase weighting method has a good sharpening effect on the peak value of the cross-correlation function, and it is verified that the improved spectral subtraction method generally has a good noise reduction effect under different SNR environments. Finally, the joint simulation results of the whole algorithm show that the combination of spectrum subtraction and cross-power spectrum phase method can effectively sharpen the peak value of cross-correlation function and improve the accuracy of time delay estimation in the low SNR environment. The results of this paper can provide useful help for sound source localization in complex environments.
    Źródło:
    Archives of Acoustics; 2020, 45, 3; 453-458
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Objectivization of Audio-Visual Correlation Analysis
    Autorzy:
    Kunka, B.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/177202.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound perception
    sound source localization
    virtual sound source shifting
    bi-modal perception
    cross-modal perception
    image proximity effect
    ventriloquism effect
    visual attention
    perceptual illusion
    eye-gaze tracking
    Opis:
    Simultaneous perception of audio and visual stimuli often causes concealment or misrepresentation of information actually contained in these stimuli. Such effects are called the "image proximity effect" or the "ventriloquism effect" in the literature. Until recently, most research carried out to understand their nature was based on subjective assessments. The authors of this paper propose a methodology based on both subjective and objectively retrieved data. In this methodology, objective data reflect the screen areas that attract most attention. The data were collected and processed by an eye-gaze tracking system. To support the proposed methodology, two series of experiments were conducted – one with a commercial eye-gaze tracking system Tobii T60, and another with the Cyber-Eye system developed at the Multimedia Systems Department of the Gdańsk University of Technology. In most cases, the visual-auditory stimuli were presented using a 3D video. It was found that the eye-gaze tracking system did objectivize the results of experiments. Moreover, the tests revealed a strong correlation between the localization of a visual stimulus on which a participant’s gaze focused and the value of the "image proximity effect". It was also proved that gaze tracking may be useful in experiments which aim at evaluation of the proximity effect when presented visual stimuli are stereoscopic.
    Źródło:
    Archives of Acoustics; 2012, 37, 1; 63-72
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microphone Based Acoustic Vector Sensor for Direction Finding with Bias Removal
    Autorzy:
    Wajid, Mohd
    Kumar, Arun
    Bahl, Rajendar
    Powiązania:
    https://bibliotekanauki.pl/articles/2141636.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic measurements
    acoustic sensor
    acoustic vector sensor
    direction-of-arrival estimation
    finite element analysis
    microphones
    particle velocity
    sound source localization
    Opis:
    The acoustic vector sensor (AVS) is used to measure the acoustic intensity, which gives the direction-of-arrival (DOA) of an acoustic source. However, while estimating the DOA from the measured acoustic intensity the finite microphone separation (d) in a practical AVS causes angular bias. Also, in the presence of noise there exists a trade off between the bias (strictly increasing function of d) and variance (strictly decreasing function of d) of the DOA estimate. In this paper, we propose a novel method for mitigating the angular bias caused due to finite microphone separation in an AVS. We have reduced the variance by increasing the microphone separation and then removed the bias with the proposed bias model. Our approach employs the finite element method (FEM) and curves fitting to model the angular bias in terms of microphone separations and frequency of a narrowband signal. Further, the bias correction algorithm based on the intensity spectrum has been proposed to improve the DOA estimation accuracy of a broadband signal. Simulation results demonstrate that the proposed bias correction scheme significantly reduces the angular bias and improves the root mean square angular error (RMSAE) in the presence of noise. Experiments have been performed in an acoustic full anechoic room to corroborate the effect of microphone separation on DOA estimation and the efficacy of the bias correction method.
    Źródło:
    Archives of Acoustics; 2022, 47, 2; 151-167
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Localization of Sound Sources in Normal Hearing and in Hearing Impaired People
    Autorzy:
    Niewiarowicz, M.
    Kaczmarek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/177064.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    localization of sound source
    ADHA
    angle of directional hearing
    tinnitus
    left-right answer system
    Opis:
    This article presents results of investigations of the angle of directional hearing acuity (ADHA) as a measure of the spatial hearing ability with a special emphasis on people with hearing impairments. A modified method proposed by Zakrzewski has been used – ADHA values have been determined for 8 azimuths in the horizontal plane at the height of the listeners’ head. The two-alternative-forced-choice method (2AFC), based on a new system of listeners’ responses (left – right instead of no difference – difference in location of sound sources) was the procedure used in the experiment. Investigations were carried out for two groups of subjects: normal hearing people (9 persons) and hearing impaired people (sensorineural hearing loss and tinnitus – 9 persons). In the experiment different acoustic signals were used: sinu- soidal signals (pure tones), 1/3 octave noise, amplitude modulated 1/3 octave noise, CCITT speech and traffic noises and signals corresponding to personal character of tinnitus for individual subjects. The results obtained in the investigations showed, in general, a better localization of the sound source for noise type signals than those for tonal signals. Inessential differences exist in ADHA values for particular signals between the two groups of subjects. On the other hand, significant differences for tinnitus signals and traffic noise signals were stated. A new system of listeners’ responses was used and appeared efficient (less dispersion of results compared to the standard system).
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 683-694
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie holografii akustycznej w ocenie mocy wypromieniowanej przez mikropompę zębatą
    Application of acoustic holography in assessing the power radiated by micro gear pump
    Autorzy:
    Osiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/270003.pdf
    Data publikacji:
    2012
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    mikropompa zębata
    holografia akustyczna
    źródła dźwięku
    lokalizacja
    micro gear pump
    acoustic holography
    sound source
    localization
    Opis:
    W artykule przedstawiono przykładowe wyniki badań akustycznych wykonanych dla mikropompy zębatej. Badania przeprowadzono z wykorzystaniem zestawu do holografii akustycznej. Wykorzystana aparatura pozwala na określenie wypromieniowanej mocy akustycznej oraz na przeprowadzenie lokalizacji źródeł dźwięku, bazując na algorytmie STSF przestrzennej transformacji pól dźwiękowych.
    In article are examples of acoustic test results carried out on the microhydraulic gear pump. Testing was conducted using a set of sound to holography. Used apparatus allows definition of radiated sound power and to carry out the location of the sound sources based on algorithm STSF spatial transformation of sound fields.
    Źródło:
    Inżynieria Maszyn; 2012, R. 17, z. 4; 93-106
    1426-708X
    Pojawia się w:
    Inżynieria Maszyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Localization of noise sources in electric cookers based on sound pressure and intensity measurements
    Autorzy:
    Jakubek, Bartosz
    Barczewski, Roman
    Tabaszewski, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/127684.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    electric cooker
    acoustic pressure
    sound intensity
    noise source localization
    kuchenka elektryczna
    ciśnienie akustyczne
    natężenie dźwięku
    lokalizacja źródeł hałasu
    Opis:
    The main aim of the study was to compare the features of acoustic maps created on the basis of measurements of sound pressure and intensity in a near acoustic field. Data for comparisons were obtained within the framework of acoustic tests of electric cookers. The results of these studies may help in the selection of acoustic mapping and optimization methods according to individual needs and/or requirements concerning selectivity, measurement bandwidth, dynamics and the ability to locate sound-emitting areas. The paper also presents the results of the spectral analysis of the dominant sources of noise in the cooker, which was helpful in identifying and locating paths of noise propagation from the inside of the cooker.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 2; 1-14
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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