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    Tytuł:
    Sound recording with the application of microphone arrays
    Autorzy:
    Kornatowski, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/97513.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    sound recording
    array microphone
    beamforming
    microphone
    Opis:
    In this article the issues concerning sound recording with the use of three-dimensional systems of several microphones were considered. The issues under study concern the so called beamforming, which is modeling three-dimensional directivity patterns of microphone arrays, as well as modern technologies of multichannel recording production with the purpose of reproduction in surround sound systems.
    Źródło:
    Computer Applications in Electrical Engineering; 2011, 9; 213-222
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Analysis of MVDR Beamformer Applied on an End-fire Microphone Array Composed of Unidirectional Microphones
    Autorzy:
    Šarić, Zoran
    Subotić, Miško
    Bilibajkić, Ružica
    Barjaktarović, Marko
    Zdravković, Nebojša
    Powiązania:
    https://bibliotekanauki.pl/articles/2141702.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adaptive beamforming
    ambient noise suppression
    differential microphone array
    end-fire microphone array
    MVDR beamformer
    Opis:
    Microphone array with minimum variance (MVDR) beamformer is a commonly used method for ambient noise suppression. Unfortunately, the performance of the MVDR beamformer is poor in a real reverberant room due to multipath wave propagation. To overcome this problem, we propose three improvements. Firstly, we propose end-fire microphone array that has been shown to have a better directivity index than the corresponding broadside microphone array. Secondly, we propose the use of unidirectional microphones instead of omnidirectional ones. Thirdly, we propose an adaptation of its adaptive algorithm during the pause of speech, which improves its robustness against the room reverberation and deviation from the optimal receiving direction. The performance of the proposed microphone array was theoretically analyzed using a diffuse noise model. Simulation analysis was performed for combined diffuse and coherent noise using the image model of the reverberant room. Real room tests were conducted using a four-microphone array placed in a small office room. The theoretical analysis and the real room tests showed that the proposed solution considerably improves speech quality.
    Źródło:
    Archives of Acoustics; 2021, 46, 4; 611-621
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using Microphone Arrays to Detect Moving Vehicle Velocity
    Autorzy:
    Peral-Orts, R.
    Velasco-Sánchez, E.
    Campillo-Davó, N.
    Campello-Vicente, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/177948.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microphone array
    sound location
    moving sources
    vehicle velocity
    Opis:
    The noise of motor vehicles is one of the most important problems as regards to pollution on main roads. However, this unpleasant characteristic could be used to determine vehicle speed by external observers. Building on this idea, the present study investigates the capabilities of a microphone array system to identify the position and velocity of a vehicle travelling on a previously established route. Such linear microphone array has been formed by a reduced number of microphones working at medium frequencies as compared to industrial microphone arrays built for location purposes, and operates with a processing algorithm that ultimately identifies the noise source location and reduces the error in velocity estimation
    Źródło:
    Archives of Acoustics; 2013, 38, 3; 407-415
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prototype measurement system for localization of partial discharges sources – microphone array
    Autorzy:
    Polak, F.
    Sikorski, W.
    Siodła, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/97228.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    partial discharges (PDs)
    PD localization
    sensor array
    microphone array
    beamforming
    direction-of-arrival (DOA)
    Opis:
    This paper presents a prototype measurement system, that will be used for localization of acoustic emission sources originating from partial discharges (PD). It is based on sensor arrays technology and direction of arrival estimation algorithms. Acoustic signals will be received with a universal linear array (ULA) of sensors, wherein the sensory elements are microphones operating in the audible frequency range. For the estimation of the direction of arrival of these signals conventional beamforming algorithm is used which has also been described theoretically. Ultimately, the system will be used to determine the direction of arrival of the acoustic signal generated by the insulation defect, which is corona discharge.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 209-219
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advances in Digitization of Microphones and Loudspeakers
    Autorzy:
    Kulka, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/177402.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electret condenser microphone
    digital microphone
    CMOS-MEMS digital microphone
    digital microphone array
    sigma-delta ADC/DAC
    digital loudspeaker
    CMOS-MEMS digital loudspeaker
    digital loudspeaker array
    Opis:
    The development of digital microphones and loudspeakers adds new and interesting possibilities of their applications in different fields, extended from industrial, medical to consumer audio markets. One of the rapidly growing field of applications is mobile multimedia, such as mobile phones, digital cameras, laptop and desktop PCs, etc. The advances have also been made in digital audio, particularly in direct digital transduction, so it is now possible to create the all-digital audio recording and reproduction chains potentially having several advantages over existing analog systems.
    Źródło:
    Archives of Acoustics; 2011, 36, 2; 419-436
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A simulation of thinning of microphone array in near-field broadband beamformers
    Autorzy:
    Wielgus, Agnieszka
    Szlachetko, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/2146656.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    acoustics
    beamforming systems
    microphone array
    thinning technique
    akustyka
    beamforming
    macierz mikrofonów
    technika przerzedzania
    Opis:
    This paper is devoted to the problem of designing an optimal microphone matrix. We define a criterion function where the performance of our matrix should be as close as possible to the desired one based on L2 norm. In the classical approach, increasing a size of the matrix is used to improve the system performance. However, in many cases it is not a good solution. In this paper we propose a solution based on thinning technique. We work with rectangular, equispaced microphone matrix and using metaheuristic approach called simulated annealing we optimise the set of active microphones (we switch off some of the microphones from the regular matrix). For illustrations, few numerical examples are solved. Comparing to the classical approach we show that thinning microphone matrix can significantly improve system performance.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021204
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Source Localization Using Kernel-based Extreme Learning Machine in Distributed Microphone Array
    Autorzy:
    Wang, Rong
    Chen, Zhe
    Yin, Fuliang
    Powiązania:
    https://bibliotekanauki.pl/articles/1953510.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    extreme learning machine
    acoustic source localization
    distributed microphone array
    generalized cross correlation function
    Opis:
    Acoustic source localization using distributed microphone array is a challenging task due to the influences of noise and reverberation. In this paper, acoustic source localization using kernel-based extreme learning machine in distributed microphone array is proposed. Specifically, the space of interest is divided into some labeled positions, and the candidate generalized cross correlation function in each node is treated as the feature mapped into the hidden nodes of extreme learning machine. During the training phase, by the implementation of kernel function, the output weights of the classifier are calculated and do not need to be tuned. After the kernel-based extreme learning machine (K-ELM) is well trained, the measured generalized cross correlation data are fed into the K-ELM classifier, and the output is the estimated acoustic source position. The proposed method needs less human intervention for both training and testing and it does not need to calibrate the node in advance. Simulation and real-world experimental results reveal that the proposed method has extremely fast training and testing speeds, and can obtain better localization performance than steered response power, K-nearest neighbor, and support vector machine methods.
    Źródło:
    Archives of Acoustics; 2021, 46, 1; 67-78
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fusing the electromagnetic articulograph, high-speed video cameras and a 16-channel microphone array for speech analysis
    Autorzy:
    Mik, Ł.
    Lorenc, A.
    Król, D.
    Wielgat, R.
    Święciński, R.
    Jędryka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/200263.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electromagnetic articulography
    microphone array
    vision system
    speech analysis
    artykulograf elektromagnetyczny
    system wizyjny
    analiza mowy
    Opis:
    Electromagnetic articulography (EMA) is one of the instrumental phonetic research methods used for recording and assessing articulatory movements. Usually, articulographic data are analysed together with standard audio recordings. This paper, however, demonstrates how coupling the articulograph with devices providing other types of information may be used in more advanced speech research. A novel measurement system is presented that consists of the AG 500 electromagnetic articulograph, a 16-channel microphone array with a dedicated audio recorder and a video module consisting of 3 high-speed cameras. It is argued that synchronization of all these devices allows for comparative analyses of results obtained with the three components. To complement the description of the system, the article presents innovative data analysis techniques developed by the authors as well as preliminary results of the system’s accuracy.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 3; 257-266
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of sound power level by using a microphone array and conventional methods
    Autorzy:
    Bogusławski, Grzegorz
    Kopania, Joanna Maria
    Gaj, Patryk
    Wójciak, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/127805.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    sound power level
    ISO methods
    microphone array
    intensity probe
    poziom mocy akustycznej
    metody ISO
    macierz mikrofonów
    sonda natężeniowa
    Opis:
    Sound power is measured to make objective comparisons between the same type of products, but also because legislation requires it. To release a new product, it is often compulsory to certify it according to International Organization for Standardization (ISO) standards, and also with national and local regulations. Determining of sound power is not a straightforward process. Sound power can be determined through the measurement of sound pressure (series 3740 methods) or sound intensity (series 9614 methods). Selecting one of the above methods depends on the purpose of the test, as well as the available equipment, desired grade of accuracy, background noise level or the test environment. Nowadays the additional methods, such as microphone arrays are used to located of the noise source and determined of pressure sound level. But the results obtained with acoustic cameras cannot be, for now, used for legislative purposes (are not ISO compliant). In this work the differences in the determination of sound power level by using conventional ISO methods and microphone arrays are determined. The system composed of a loudspeaker and a fan were used as a sound source of the noise. Sound power levels according to ISO 3746 and ISO 9614-1 were determined and were compared with the developed method by using microphone arrays techniques.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 1; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing speech signals based on an mems microphone array and temporal differences in the incoming signal
    Autorzy:
    Felcyn, Jan
    Raszewski, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2202430.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    microphone array
    speech enhancement
    direction of arrival
    signal processing
    macierz mikrofonów
    uzdatnianie mowy
    kierunek nadejścia sygnału
    przetwarzanie sygnałów
    Opis:
    The development of the Internet of things and automatisation in everyday life also influences our houses. There are more and more devices on the market which can be controlled remotely. One kind of such control involves the use of voice signals. This method tends to use microphone arrays and dedicated algorithms to enhance the speech signal and recognize the words in it. In this project, a small 5-microphone array was developed. To enhance the quality of the signal, dedicated software was written. It consists of several modules, including the direction of arrival estimation, denoising, and differentiation between adults and children. The results showed that the custom algorithm can increase the signal to noise ratio by up to 6 dB.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022202
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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