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    Wyświetlanie 1-11 z 11
    Tytuł:
    A System for Acoustic Field Measurement Employing Cartesian Robot
    Autorzy:
    Szczodrak, M.
    Kurowski, A.
    Kotus, J.
    Czyżewski, A.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/221435.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Cartesian robot
    sound intensity
    sound field
    anechoic chamber
    Opis:
    A system setup for measurements of acoustic field, together with the results of 3D visualisations of acoustic energy flow are presented in the paper. Spatial sampling of the field is performed by a Cartesian robot. Automatization of the measurement process is achieved with the use of a specialized control system. The method is based on measuring the sound pressure (scalar) and particle velocity(vector) quantities. The aim of the system is to collect data with a high precision and repeatability. The system is employed for measurements of acoustic energy flow in the proximity of an artificial head in an anechoic chamber. In the measurement setup an algorithm for generation of the probe movement path is included. The algorithm finds the optimum path of the robot movement, taking into account a given 3D object shape present in the measurement space. The results are presented for two cases, first without any obstacle and the other - with an artificial head in the sound field.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 3; 333-343
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of sound quality features on environmental noise effects - a case study applied to road traffic noise
    Autorzy:
    Paszkowski, W.
    Kotus, J.
    Poremski, T.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/221346.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound quality
    annoyance
    traffic noise
    Opis:
    The paper shows a study on the relationship between noise measures and sound quality (SQ) features that are related to annoyance caused by the traffic noise. First, a methodology to perform analyses related to the traffic noise annoyance is described including references to parameters of the assessment of road noise sources. Next, the measurement setup, location and results are presented along with the derived sound quality features. Then, statistical analyses are performed to compare the measurement results and sound quality features. The included conclusions are focused on showing that the obtained loudness values, regardless of the used system, are similar in a statistical sense. Contrarily, sharpness, roughness and fluctuation strength values differ for the tools employed.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 3; 517-531
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Retrospecting Polish Audio Engineering Society Membership on 20th Anniversary of the Polish Section of the Audio Engineering Society
    Autorzy:
    Kostek, B.
    Sankiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/177356.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    audio and sound engineering
    musical acoustics
    Opis:
    In this article some key events concerning founding Polish Section of the Audio Engineering Society were presented. In addition, the history covering International Symposia on Sound Engineering and Mastering was outlined. Also, papers contained in this issue were shortly reviewed.
    Źródło:
    Archives of Acoustics; 2011, 36, 2; 187-197
    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:
    3D Acoustic Field Intensity Probe Design and Measurements
    Autorzy:
    Kotus, J.
    Czyżewski, A.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/176807.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound intensity
    acoustic vector sensor
    calibration
    measurements
    Opis:
    The aim of this paper is two-fold. First, some basic notions on acoustic field intensity and its measurement are shortly recalled. Then, the equipment and the measurement procedure used in the sound intensity in the performed research study are described. The second goal is to present details of the design of the engineered 3D intensity probe, as well as the algorithms developed and applied for that purpose. Results of the intensity probe measurements along with the calibration procedure are then contained and discussed. Comparison between the engineered and the reference commercial probe confirms that the designed construction is applicable to the sound field intensity measurements with a sufficient effectiveness.
    Źródło:
    Archives of Acoustics; 2016, 41, 4; 701-711
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sound Intensity Distribution Around Organ Pipe
    Autorzy:
    Odya, P.
    Kotus, J.
    Szczodrak, M.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/177568.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    organ pipe
    acoustic vector sensor
    sound intensity
    Cartesian robot
    Opis:
    The aim of the paper was to compare acoustic field around the open and stopped organ pipes. The wooden organ pipe was located in the anechoic chamber and activated with a constant air flow, produced by an external air-compressor. Thus, a long-term steady state response was possible to obtain. Multichannel acoustic vector sensor was used to measure the sound intensity distribution of radiated acoustic energy. Measurements have been carried out on a defined fixed grid of points. A specialized Cartesian robot allowed for a precise positioning of the acoustic probe. The resulted data were processed in order to obtain and visualize the sound intensity distribution around the pipe, taking into account the type of the organ pipe, frequency of the generated sound, the sound pressure level and the direction of acoustic energy propagation. For the open pipe, an additional sound source was identified at the top of the pipe. In this case, the streamlines in front of the pipe are propagated horizontally and in a greater distance than in a case of the stopped pipe, moreover they are directed downwards. For the stopped pipe, the streamlines of the acoustic flow were directed upwards. The results for both pipe types were compared and discussed in the paper.
    Źródło:
    Archives of Acoustics; 2017, 42, 1; 13-22
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Preference for Surround Microphone Techniques Used in the Recording of Choir and Instrumental Ensemble
    Autorzy:
    Sitek, A.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/177404.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surround microphone techniques
    musical recording
    direct/ambient
    direct-sound all-around
    Opis:
    The aim of this paper is to describe the process of choosing the best surround microphone technique for recording of choir with an instrumental ensemble. First, examples of multichannel microphone techniques including those used in the recording are described. Then, the assumptions and details of music recording in Radio Gdansk Studio are provided as well as the process of mixing of the multichannel recording. The extensive subjective tests were performed employing a group of sound engineers and students in order to find the most preferable recording techniques. Because the final recording is based on the mix of "direct/ambient" and "direct-sound all-around" approaches, a subjective quality evaluation was conducted and on this basis the best rated multichannel techniques were chosen. The results show that listeners might consider different factors when choosing the best rated multichannel techniques in separate tasks, as different systems were chosen in the two tests.
    Źródło:
    Archives of Acoustics; 2011, 36, 2; 365-378
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and Designing Acoustical Conditions of the Interior – Case Study
    Autorzy:
    Kostek, B.
    Laskowski, S.
    Mizgier, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/176652.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic field analysis
    acoustic field modeling
    acoustic conditions measurements
    acoustic conditions analysis
    sound reinforcement system design
    Opis:
    The primary aim of this research study was to model acoustic conditions of the Courtyard of the Gdańsk University of Technology Main Building, and then to design a sound reinforcement system for this interior. First, results of measurements of the parameters of the acoustic field are presented. Then, the comparison between measured and predicted values using the ODEON program is shown. Collected data indicate a long reverberation time which results in poor speech intelligibility. Then, a thorough analysis is perform to improve the acoustic properties of the model of the interior investigated. On the basis of the improved acoustic model two options of a sound reinforcement system for this interior are proposed, and then analyzed. After applying sound absorbing material it was noted that the predicted speech intelligibility increased from bad/poor rating to good category.
    Źródło:
    Archives of Acoustics; 2016, 41, 3; 473-484
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiar rozkładu wektora natężenia dźwięku w pobliżu dyfuzora akustycznego weryfikowany symulacją komputerową
    Numerical simulation of the sound intensity distribution in the proximity of the acoustic diffuser
    Autorzy:
    Kurowski, A.
    Kotus, J.
    Kostek, B.
    Czyżewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/267168.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    dyfuzor akustyczny
    akustyka pomieszczeń
    wektor natężenia akustycznego
    metoda elementów brzegowych
    acoustic diffuser
    room acoustics
    sound intensity vector
    boundary element method
    Opis:
    Projektowanie adaptacji akustycznej pomieszczeń jest złożonym procesem, który wymaga możliwości przewidywania wpływu zastosowanych ustrojów akustycznych na sposób propagacji fal akustycznym w pomieszczeniu. Przykładem ustroju stosowanego do korekcji akustyki pomieszczeń jest dyfuzor akustyczny. Niniejsza praca opisuje proces pomiaru oraz numerycznej symulacji rozkładu wektora natężenia dźwięku w pobliżu dyfuzora. Analiza tego rozkładu pozwala zaobserwować zjawisko transportu energii akustycznej w pobliżu badanego obiektu. Wyniki badań przedstawiono w formie graficznej. Przygotowane zostały także mapy różnic pomiędzy rozkładem wektora natężenia dźwięku zmierzonego bez i z dyfuzorem. Jako obiekt referencyjny wykorzystana została płaska powierzchnia odbijająca. Dzięki takiemu podejściu możliwe było zaobserwowanie i opisanie wpływu zjawiska rozproszenia dźwięku przez dyfuzor na rozkład otaczającego pola akustycznego.
    Acoustic treatment of rooms is a complex task which is often connected with simulation of the impact of used acoustic systems on the propagation of sound waves in the place of interest. An example of such sound system is the acoustic diffuser. In this work, we present a process of the measurement and numerical simulation of the sound intensity vector distribution in the proximity of the acoustic diffuser. This distribution may provide useful information related to the phenomena of energy transport in the sound field surrounding the diffuser. Results of the measurement and simulation are visualized in the form of grayscale maps of the sound intensity vector absolute value and arrows denoting its direction and sense. There are three types of measured sound field: one without any obstacle in front of the sound source, one with the diffuser placed in front of the source and the last one with the smooth reflecting plate in front of the source. The second and the third scenarios are used as references for the first measurement. Such an approach allowed the calculation of the map of differences between the acoustic field with the obstacle and without the obstacle in front of the sound source and a better visualization of the impact of those acoustic devices on the sound field.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2016, 51; 97-101
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Classification of Music Genres Based on Music Separation into Harmonic and Drum Components
    Autorzy:
    Rosner, A.
    Schuller, B.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/177566.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    music information retrieval
    musical sound separation
    drum separation
    music genre classification
    support vector machine (SVM)
    co-training
    nonnegative matrix factorization
    Opis:
    This article presents a study on music genre classification based on music separation into harmonic and drum components. For this purpose, audio signal separation is executed to extend the overall vector of parameters by new descriptors extracted from harmonic and/or drum music content. The study is performed using the ISMIS database of music files represented by vectors of parameters containing music features. The Support Vector Machine (SVM) classifier and co-training method adapted for the standard SVM are involved in genre classification. Also, some additional experiments are performed using reduced feature vectors, which improved the overall result. Finally, results and conclusions drawn from the study are presented, and suggestions for further work are outlined.
    Źródło:
    Archives of Acoustics; 2014, 39, 4; 629-638
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of Noise Map Service Working in Cloud Computing Environment
    Autorzy:
    Marciniuk, K.
    Szczodrak, M.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/177042.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise maps
    dynamic noise maps
    sound propagation
    environmental noise
    web applications
    cloud computing
    mapy hałasu
    mapy dynamiczne hałasu
    rozprzestrzenianie się dźwięku
    hałas środowiskowy
    aplikacje sieci Web
    przetwarzanie w chmurze
    Opis:
    In the paper, a noise map service designated for the user interested in environmental noise is presented. Noise prediction algorithm and source model, developed for creating acoustic maps, are working in the cloud computing environment. In the study, issues related to the noise modelling of sound propagation in urban spaces are discussed with a particular focus on traffic noise. Examples of results obtained through a web application created for that purpose are shown. In addition, these are compared to results obtained from the commercial software simulations based on two road noise prediction models. Moreover, the computing performance of the developed application is investigated and analyzed. In the paper, a flowchart simulating the operation of the noise web-based service is presented showing that the created application is easy to use even for people with little experience in computer technology.
    Źródło:
    Archives of Acoustics; 2016, 41, 2; 297-302
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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