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    Wyświetlanie 1-15 z 15
    Tytuł:
    The influence of ski helmets on sound perception and sound localisation on the ski slope
    Autorzy:
    Ružić, Lana
    Tudor, Anton
    Radman, Ivan
    Kasović, Mario
    Cigrovski, Vjekoslav
    Powiązania:
    https://bibliotekanauki.pl/articles/2177410.pdf
    Data publikacji:
    2015-04-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    skiing
    ski helmet
    sound localization
    hearing
    Opis:
    Objectives The aim of the study was to investigate whether a ski helmet interferes with the sound localization and the time of sound perception in the frontal plane. Material and Methods Twenty-three participants (age 30.7±10.2) were tested on the slope in 2 conditions, with and without wearing the ski helmet, by 6 different spatially distributed sound stimuli per each condition. Each of the subjects had to react when hearing the sound as soon as possible and to signalize the correct side of the sound arrival. Results The results showed a significant difference in the ability to localize the specific ski sounds; 72.5±15.6% of correct answers without a helmet vs. 61.3±16.2% with a helmet (p < 0.01). However, the performance on this test did not depend on whether they were used to wearing a helmet (p = 0.89). In identifying the timing, at which the sound was firstly perceived, the results were also in favor of the subjects not wearing a helmet. The subjects reported hearing the ski sound clues at 73.4±5.56 m without a helmet vs. 60.29±6.34 m with a helmet (p < 0.001). In that case the results did depend on previously used helmets (p < 0.05), meaning that that regular usage of helmets might help to diminish the attenuation of the sound identification that occurs because of the helmets. Conclusions Ski helmets might limit the ability of a skier to localize the direction of the sounds of danger and might interfere with the moment, in which the sound is firstly heard.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2015, 28, 2; 389-394
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Vector Sensors to Acoustic Surveillance of a Public Interior Space
    Autorzy:
    Łopatka, K.
    Kotus, J.
    Czyżewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/176963.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound localization
    acoustic vector sensors
    acoustic events
    Opis:
    A method for precise sound sources detection and localization in interiors is presented. Acoustic vector sensors, which provide multichannel output signals of acoustic pressure and particle velocity were employed. Methods for detecting acoustic events are introduced. The algorithm for localizing sound events in the audience is presented. The system set up in a lecture hall, which serves as a demonstrator of the proposed technology, is described. The accurracy of the proposed method is evaluated by the described measurement results. The analysis of the results is followed by conclusions pertaining the usability of the proposed system. The concept of the multimodal audio-visual detection of events in the audience is also introduced.
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 851-860
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Auditory occupancy grids with a mobile robot
    Autorzy:
    DeJong, B. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/384355.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    auditory occupancy grids
    sound localization
    occupancy grids
    mobile robot
    Opis:
    This paper presents the use of auditory occupancy grids (AOGs) for mapping of a mobile robot’s acoustic environment. An AOG is a probabilistic map of sound source locations built from multiple measurements using techniques from both probabilistic robotics and sound localization. The mapping is simulated, tested for robustness, and then successfully implemented on a threemicrophone mobile robot with four sound sources. Using the robot’s inherent advantage of mobility, the AOG correctly locates the sound sources from only nine measurements. The resulting map is then used to intelligently position the robot within the environment and to maintain auditory contact with a moving target.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 3; 3-12
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multimodal Perceptual Training for Improving Spatial Auditory Performance in Blind and Sighted Listeners
    Autorzy:
    Bǎlan, O.
    Moldoveanu, A.
    Moldoveanu, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/177275.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    front-back confusions
    HRTF
    sound localization
    training
    virtual auditory environment
    Opis:
    The use of individualised Head Related Transfer Functions (HRTF) is a fundamental prerequisite for obtaining an accurate rendering of 3D spatialised sounds in virtual auditory environments. The HRTFs are transfer functions that define the acoustical basis of auditory perception of a sound source in space and are frequently used in virtual auditory displays to simulate free-field listening conditions. However, they depend on the anatomical characteristics of the human body and significantly vary among individuals, so that the use of the same dataset of HRTFs for all the users of a designed system will not offer the same level of auditory performance. This paper presents an alternative approach to the use on non-individualised HRTFs that is based on a procedural learning, training, and adaptation to altered auditory cues.We tested the sound localisation performance of nine sighted and visually impaired people, before and after a series of perceptual (auditory, visual, and haptic) feedback based training sessions. The results demonstrated that our subjects significantly improved their spatial hearing under altered listening conditions (such as the presentation of 3D binaural sounds synthesised from non-individualized HRTFs), the improvement being reflected into a higher localisation accuracy and a lower rate of front-back confusion errors.
    Źródło:
    Archives of Acoustics; 2015, 40, 4; 491-502
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibilities of spatial hearing testing in occupational medicine
    Autorzy:
    Przewoźny, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2177417.pdf
    Data publikacji:
    2016-06-28
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    spatial hearing
    directional hearing
    sound localization
    hearing testing in workers
    auditory fitness for duty
    hearing impairment
    Opis:
    Dysfunctions of the organ of hearing are a significant limitation in the performance of occupations that require its full efficiency (vehicle driving, army, police, fire brigades, mining). Hearing impairment is associated with poorer understanding of speech and disturbed sound localization that directly affects the worker’s orientation in space and his/her assessment of distance and location of other workers or, even most importantly, of dangerous machines. Testing sound location abilities is not a standard procedure, even in highly specialized audiological examining rooms. It should be pointed out that the ability to localize sounds which are particularly loud, is not directly associated with the condition of the hearing organ, but is rather considered an auditory function of a higher level. Disturbances in sound localization are mainly associated with structural and functional disturbances of the central nervous system and occur also in patients with normal hearing when tested with standard methods. The article presents different theories explaining the phenomenon of sound localization, such as interaural differences in time, interaural differences in sound intensity, monaural spectrum shape and the anatomical and physiological basis of these processes. It also describes methods of measurement of disturbances in sound localization which are used in Poland and around the world, also by the author of this work. The author analyzed accessible reports on sound localization testing in occupational medicine and the possibilities of using such tests in various occupations requiring full fitness of the organ of hearing.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2016, 29, 4; 527-538
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of the acoustic wave scattering on the aircraft surface using the boundary element method
    Autorzy:
    Nowicki, Dawid
    Suder-Dębska, Katarzyna
    Czajka, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/24201977.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    sound localization
    boundary element method
    sound scattering
    noise
    aircraft
    Smart Acoustics
    lokalizacja dźwięku
    metoda elementów brzegowych
    rozproszenie dźwięku
    hałas
    samolot
    Opis:
    Sound localization tools are important in the environmental protection and the human searches. The article is one of the stages of the implementation of the concept of using aircraft to localize sound sources. The use of a fixed-wing aircraft instead of a multirotor would increase the total flight time, and expand the surveyed area. It is important to determine the most favourable positions of the receivers on the surface of the aircraft. The scattering effects of the sound waves coming from the ground source and aircraft engine on the acoustic field on the aircraft surface are not homogeneous. In the article the authors present the modelling of the scattering of the sound waves over the airplane surface with the usage of boundary element methods. After determining the effects from the sound source on earth and from the aircraft engine the conclusion was made, that the influence from the engine noise is greater than that from the ground source, and in order to localize the low amplitude signals, the aircraft need to glide. Considering only the effects of the ground source, the optimal areas for the microphones placement were determined.
    Źródło:
    Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023107
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Detection and Localization of Audio Event for Home Surveillance Using CRNN
    Autorzy:
    Suruthhi, V. S.
    Smita, V.
    Rolant Gini, J.
    Ramachandran, K. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055274.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    convolutional recurrent neural network
    CRNN
    gated recurrent unit
    GRU
    long short-term memory
    LSTM
    sound event localization and detection
    SELD
    Opis:
    Safety and security have been a prime priority in people’s lives, and having a surveillance system at home keeps people and their property more secured. In this paper, an audio surveillance system has been proposed that does both the detection and localization of the audio or sound events. The combined task of detecting and localizing the audio events is known as Sound Event Localization and Detection (SELD). The SELD in this work is executed through Convolutional Recurrent Neural Network (CRNN) architecture. CRNN is a stacked layer of convolutional neural network (CNN), recurrent neural network (RNN) and fully connected neural network (FNN). The CRNN takes multichannel audio as input, extracts features and does the detection and localization of the input audio events in parallel. The SELD results obtained by CRNN with the gated recurrent unit (GRU) and with long short-term memory (LSTM) unit are compared and discussed in this paper. The SELD results of CRNN with LSTM unit gives 75% F1 score and 82.8% frame recall for one overlapping sound. Therefore, the proposed audio surveillance system that uses LSTM unit produces better detection and overall performance for one overlapping sound.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 735--741
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    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:
    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:
    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:
    Providing Surround Sound with Loudspeakers: A Synopsis of Current Methods
    Autorzy:
    Blauert, J.
    Rabenstein, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/177153.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surround sound
    holography
    wavefield synthesis
    ambisonics
    amplitude panning
    summing localization
    Opis:
    Available methods for room-related sound presentation are introduced and evaluated. A focus is put on the synthesis side rather than on complete transmission systems. Different methods are compared using common, though quite general criteria. The methods selected for comparison are: INTENSITY STEREOPHONY after Blumlein, vector-base amplitude panning (VBAP), 5.1-SURROUND and its discrete-channel derivatives, synthesis with spherical harmonics (AMBISONICS, HOA), synthesis based on the boundary method, namely, wave-field synthesis (WFS), and binaural-cue selection methods (e.g., DIRAC). While VBAP, 5.1-SURROUND and other discrete-channel-based methods show a number of practical advantages, they do, in the end, not aim at authentic sound-field reproduction. The so-called holophonic methods that do so, particularly, HOA and WFS, have specific advantages and disadvantages which will be discussed. Yet, both methods are under continuous development, and a decision in favor of one of them should be taken from a strictly application-oriented point of view by considering relevant application-specific advantages and disadvantages in detail.
    Źródło:
    Archives of Acoustics; 2012, 37, 1; 5-18
    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
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