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    Wyświetlanie 1-14 z 14
    Tytuł:
    LibLaura: A Library for Binaural Sound Source Localization
    Autorzy:
    Kruczkowski, P.
    Mąka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/114369.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    software library
    binaural localization
    time delay estimation
    Opis:
    In this work the software library for binaural sound localization is presented. The main purpose of the library are the applications for localization tasks in audio systems based on two microphones. The implemented mechanisms include binaural single sound source localization, ITD (Interaural Time Difference) and ILD (Interaural Level Difference) cues and support real-time analysis. LibLaura is written in C++ language and is easily extensible to support new features, time delay estimators and user-defined callbacks.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 12; 399-401
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid Algorithm Computation Methodology to Accelerate Sound Source Localization
    Autorzy:
    Ibala, C.
    Escobar, F.
    Chanang, X.
    Valderrama, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/397999.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    DSB
    GCC
    interfejs algorytmu
    lokalizacja
    FPPGA
    algorithm interface
    localization
    Opis:
    Latest algorithm solutions for sound source localization have dramatically increased their computation burden. This paper proposes a novel hybrid algorithm with the ability to adapt its search spectrum based on target movement; we also show some studies and metrics to analyze its implementation constraints and remark its advantages over previous solutions. The proposed algorithm provides a good balance between processing power and real-time execution; our approach combines the General Cross Correlation (GCC) with the Delay and Sum Beamforming (DSB) algorithm, such that, less than 50% of thee DSB computation is necessary to locate the sound source.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2012, 3, 3; 99-110
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Passive sound source localization system
    Pasywny system lokalizacji źródeł dźwięku
    Autorzy:
    Baszun, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/341121.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    transformacja fazy
    lokalizacja źródła
    macierze mikrofonów
    phase transform
    source localization
    microphone arrays
    Opis:
    Acoustic source localization system for speech signals based on five microphone array was developed. Three dimensional position computation is based on time delay estimation between pairs of microphones. The psyhoacoustically motivated voice activity detector was used to robustly determine activity of speaker in presence of background noise. The detector was based on modulation properties of human speech. Good performance was obtain by selecting frames with speech and nulling frequency bands without speech components. As the result more precisely computation of the time delay was possible. Real experiments shown good immunity of the proposed algorithm to noise and reverberation.
    Opracowano metodę lokalizacji akustycznych źródeł dźwięku zorientowaną na sygnału mowy. System zbudowano w oparciu o macierz pięciu mikrofonów. Obliczenia pozycji źródła w trzech wymiarach dokonano na podstawie estymacji różnicy czasu przybycia dla par mikrofonów. Zastosowany psychoakustycznie motywowany detektor mowy umożliwia ocenę aktywności mówcy w obecności zakłóceń. Dobrą efektywność uzyskano poprzez selekcję ramek z mową oraz zerowanie zakresów częstotliwości w których sygnał zakłócający maskuje sygnał mowy. Jego zaletą jest możliwość precyzyjnego obliczania czasu opóźnienia. Eksperymenty w warunkach rzeczywistych pokazują dobrą odporność zaproponowanego algorytmu na szum i pogłos.
    Źródło:
    Zeszyty Naukowe Politechniki Białostockiej. Informatyka; 2011, 7; 5-16
    1644-0331
    Pojawia się w:
    Zeszyty Naukowe Politechniki Białostockiej. Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An implementation of binaural sound source localization in programmable devices
    Autorzy:
    Łazoryszczak, M.
    Wernik, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/114224.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    CPLD
    FPGA
    programmable devices
    binaural localization
    time delay estimation
    Opis:
    In this paper an example of hardware implementation of binaural sound source localization is presented. Using only two microphones, which correspond approximately to binaural hearing, limits the possibility of exact sound source localization. In contrast to human auditory system (HAS), only the angle of arrival determination is possible in implemented system. Moreover, the angle of arrival (AoA) could be determined here in a limited range of values located on a half-plane. First, the base formulas used by implemented algorithm are shown. Next, selected hardware platforms and peripheral modules are described. The VHDL tools for synthesis and implementation are used. Finally, resources consumed by hardware CPLD/FPGA implementation and selected test results are presented.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 12; 396-398
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Sound Reproduction Method on Performance in Sound Source Localization by Visually Impaired and Normally Sighted Subjects
    Autorzy:
    Furmann, A.
    Skrodzka, E.
    Giżewski, Ł.
    Nowotny, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400071.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.66.Pn
    Opis:
    The study was undertaken to check the effect of 3D sound recording and reproduction methods on performance in localization of sound source by the visually impaired and normally sighted subjects. The performance was evaluated on the basis of the ability to identify the direction from which the sound comes and the direction of its propagation. The experiment involved a test in which the subjects were exposed to sounds reproduced by two methods of spatial reproduction: binaural (headphones) and Ambisonics (loudspeaker). The binaural recordings were reproduced through two types of headphones, open and closed ones, and the recordings were made with the help of a dummy head. The recordings for loudspeaker reproduction were made with the use of two microphone matrices, Octava and Panasonic. The subjects were adults and children, including blind and VIC. They had otologically normal hearing. The test included realization of three tasks. The first concerned identification of the direction from which sound has come from an immovable source, a rattle or a drum. In the second and third task, the subjects were asked to indicate the direction of motion of the source of sound (vehicle). For the adults, the method of recording and reproduction of sound had little effect on the test results. For the VIC, a significant difference was noted between the results of headphone and loudspeaker exposure, to the advantage of the headphone exposure. The method of binaural recording and sound exposure through headphones seems much more effective for auditory training of VIC.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 988-994
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    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:
    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:
    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
    Tytuł:
    Localization of the Sound Source with the Use of the First-order Ambisconic Microphone
    Autorzy:
    Wierzbicki, J.
    Małecki, P.
    Wiciak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400103.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.58.Vb
    43.60.Jn
    43.20.Ye
    Opis:
    The paper presents results of determination of sound wave direction based on signals from first-order ambisonic microphone. The experiment consisted in recording the test signals with the SoundField microphone positioned in the axis of the turntable in the anechoic chamber. The spherical coordinates of the sound intensity vector were calculated with use of three different conceptual and numerical approaches and were compared to actual values resulting from the geometry of the system. Accuracy of the localization of the sound source depending on the frequencies and the method for determination of the spherical coordinates as well as on the time constant and the parameters of the signal recording was presented. The obtained results show the effectiveness of the calculation methods used for localization of the sound source.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 1114-1117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of the Effect of a Sound Source Location on the Steady-State Response of a Two-Room Coupled System
    Autorzy:
    Meissner, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/177058.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    coupled room system
    steady-state room response
    potential and kinetic energy densities
    localization of modes
    Opis:
    In this paper, the computer modelling application based on the modal expansion method is developed to study the influence of a sound source location on a steady- state response of coupled rooms. In the research, an eigenvalue problem is solved numerically for a room system consisting of two rectangular spaces connected to one another. A numerical procedure enables the computation of shape and frequency of eigenmodes, and allows one to predict the potential and kinetic energy densities in a steady-state. In the first stage, a frequency room response for several source positions is investigated, demonstrating large deformations of this response for strong and weak modal excitations. Next, a particular attention is given to studying how the changes in a source position influence the room response when a source frequency is tuned to a resonant frequency of a strongly localized mode.
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 761-775
    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
      Wyświetlanie 1-14 z 14

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