Готові списки джерел за темами / Two-microphone method

Добірка наукової літератури з теми "Two-microphone method"

Автор: Grafiati

Опубліковано: 13 вересня 2021

Оновлено: 2 лютого 2022

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Статті в журналах з теми "Two-microphone method":

Schultz, Todd, Mark Sheplak, and Louis N. Cattafesta. "Uncertainty analysis of the two-microphone method." Journal of Sound and Vibration 304, no. 1-2 (July 2007): 91–109. http://dx.doi.org/10.1016/j.jsv.2007.02.015.

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Katz, Brian F. G. "Method to resolve microphone and sample location errors in the two-microphone duct measurement method." Journal of the Acoustical Society of America 108, no. 5 (November 2000): 2231–37. http://dx.doi.org/10.1121/1.1314318.

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Nakagawa, C. Renato C., Sven Nordholm, and Wei-Yong Yan. "Analysis of Two Microphone Method for Feedback Cancellation." IEEE Signal Processing Letters 22, no. 1 (January 2015): 35–39. http://dx.doi.org/10.1109/lsp.2014.2345571.

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Moritz, C., and J. S. Lamancusa. "A two‐microphone method for source strength measurement." Journal of the Acoustical Society of America 87, S1 (May 1990): S11. http://dx.doi.org/10.1121/1.2027877.

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Louis, B., G. Glass, B. Kresen, and J. Fredberg. "Airway Area by Acoustic Reflection: The Two-Microphone Method." Journal of Biomechanical Engineering 115, no. 3 (August 1, 1993): 278–85. http://dx.doi.org/10.1115/1.2895487.

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This report deals with noninvasive imaging of airway geometry based upon information contained in acoustic reflections measured at the mouth. Here we describe a new theoretical approach that enables development of a new miniaturized apparatus. Unlike the single-transducer systems used currently, this new strategy is based upon a two-transducer system that is a variant of that suggested originally by Shroeder (1967). We have developed, implemented, and tested computational algorithms necessary to reconstruct airway dimensions from acoustic reflection data using this two-transducer strategy.

Mielnicka-Pate, A. L., and J. Adin Mann III. "Piston Radiation Investigations Using Two-Microphone Sound Intensity Method." Noise Control Engineering Journal 27, no. 2 (1986): 36. http://dx.doi.org/10.3397/1.2827670.

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Jiang, Bo, XiaoQin Liu, and Xing Wu. "Phase calibration method for microphone array based on multiple sound sources." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 659–69. http://dx.doi.org/10.3397/in-2021-1620.

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In the microphone array, the phase error of each microphone causes a deviation in sound source localization. At present, there is a lack of effective methods for phase error calibration of the entire microphone array. In order to solve this problem, a phase mismatch calculation method based on multiple sound sources is proposed. This method requires collecting data from multiple sound sources in turn, and constructing a nonlinear equation setthrough the signal delay and the geometric relationship between the microphones and the sound source positions. The phase mismatch of each microphone can be solved from the nonlinear equation set. Taking the single frequency signal as an example, the feasibility of the method is verified by experiments in a semi-anechoic chamber. The phase mismatches are compared with the calibration results of exchanging microphone. The difference of the phase error values measured by the two methods is small. The experiment also shows that the accuracy of sound source localization by beamforming is improved. The method is efficient for phase error calibration of arrays with a large number of microphones.

Louis, B., G. M. Glass, and J. J. Fredberg. "Pulmonary airway area by the two-microphone acoustic reflection method." Journal of Applied Physiology 76, no. 5 (May 1, 1994): 2234–40. http://dx.doi.org/10.1152/jappl.1994.76.5.2234.

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We noninvasively assessed airway dimensions from acoustic reflection data measured at the mouth. We recently described a two-transducer system for measurement of the nasal airway. Here we apply this approach to the measurement of the upper airway and trachea. We describe the theoretical implications of breathing on this kind of measurement and propose a new procedure that, unlike single- and dual-transducer systems used currently, does not require the use of He-O2 for inference of geometry of subglottic airways.

Suzuki, Seiichirou, and Takurou Hayashi. "Study on Howling in Active Noise Control. Two-Microphone Method." Transactions of the Japan Society of Mechanical Engineers Series C 59, no. 558 (1993): 515–20. http://dx.doi.org/10.1299/kikaic.59.515.

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Jekosch, Simon, and Ennes Sarradj. "An Extension of the Virtual Rotating Array Method Using Arbitrary Microphone Configurations for the Localization of Rotating Sound Sources." Acoustics 2, no. 2 (May 15, 2020): 330–42. http://dx.doi.org/10.3390/acoustics2020019.

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The characterization of rotating aeroacoustic sources using microphone array methods has been proven to be a useful tool. One technique to identify rotating sources is the virtual rotating array method. The method interpolates the pressure time data signals between the microphones in a stationary array to compensate the motion of the rotating sources. One major drawback of the method is the requirement of ring array geometries that are centred around the rotating axis. This contribution extends the virtual rotating array method to arbitrary microphone configurations. Two different ways to interpolate the time signals between the microphone locations are proposed. The first method constructs a mesh between the microphone positions using Delaunay-triangulation and interpolates over the mesh faces using piecewise linear functions. The second one is a meshless technique which is based on radial basis function interpolation. The methods are tested on synthetic array data from a benchmark test case as well as on experimental data obtained with a spiral array and a five-bladed fan.

Більше джерел

Дисертації з теми "Two-microphone method":

Calton, Matthew Franklin. "Modeling of Acoustic Resonators and Resonator Systems for Use in Passive Noise Control." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/9261.

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Acoustic resonators, such as the Helmholtz and quarter-wave resonator, can be used to attenuate unwanted noise in an enclosed space. Classical formulations can be used to approximate resonator performance for a given resonator configuration, but may lack sufficient accuracy for some applications. This research aims to improve the analytical characterization of resonators to provide better correlation to experimental results. Using higher-order approximations and proper end corrections, more accuracy can be obtained in calculating the impedance and resonance frequency of a single resonator, which will then carry over into the overall configuration of the model. The impedance of a system of resonators in parallel is also considered, where the effects of acoustic coupling can be observed. Resonators with complex, non-ideal geometries are explored for applications where space is limited. The effects of tapers and toroidal curves are considered using impedance translation methods. These theoretical predictions are found to compare favorably with empirical data. Coupling between an enclosure and resonator system is explored experimentally. The effects of resonator placement, damping, and relative cavity and enclosure volume are considered. These data are used to design and test a resonator system with 10 dB of attenuation over a bandwidth of 10 Hz.

Ramanathan, Sathish Kumar. "Linear Acoustic Modelling and Testing of Exhaust Mufflers." Thesis, KTH, Aeronautical and Vehicle Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4340.

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Intake and Exhaust system noise makes a huge contribution to the interior and exterior noise of automobiles. There are a number of linear acoustic tools developed by institutions and industries to predict the acoustic properties of intake and exhaust systems. The present project discusses and validates, through measurements, the proper modelling of these systems using BOOST-SID and discusses the ideas to properly convert a geometrical model of an exhaust muffler to an acoustic model. The various elements and their properties are also discussed.

When it comes to Acoustic properties there are several parameters that describe the performance of a muffler, the Transmission Loss (TL) can be useful to check the validity of a mathematical model but when we want to predict the actual acoustic behavior of a component after it is installed in a system and subjected to operating conditions then we have to determine other properties like Attenuation, Insertion loss etc,.

Zero flow and Mean flow (M=0.12) measurements of these properties were carried out for mufflers ranging from simple expansion chambers to complex geometry using two approaches 1) Two Load technique 2) Two Source location technique. For both these cases, the measured transmission losses were compared to those obtained from BOOST-SID models.

The measured acoustic properties compared well with the simulated model for almost all the cases.

Nance, Donald Kirby. "Separating contributions of small-scale turbulence, large-scale turbulence, and core noise from far-field exhaust noise measurements." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19768.

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Thesis (Ph.D)--Aerospace Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Ahuja, Krishan K.; Committee Member: Cunefare, Kenneth; Committee Member: Lieuwen, Tim C.; Committee Member: Mendoza, Jeff; Committee Member: Sankar, Lakshmi.

Частини книг з теми "Two-microphone method":

Fan, L., B. R. Wang, T. Jin, Y. Shen, and S. Y. Zhang. "Study on thermoacoustic resonance pipe driven by loudspeaker using two-microphone method." In Proceedings of the Twentieth International Cryogenic Engineering Conference (ICEC20), 345–48. Elsevier, 2005. http://dx.doi.org/10.1016/b978-008044559-5/50083-1.

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Тези доповідей конференцій з теми "Two-microphone method":

Baghaki, Ali, M. Omair Ahmad, and M. N. S. Swamy. "A new two-stage method for single-microphone speech dereverberation." In 2016 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2016. http://dx.doi.org/10.1109/iscas.2016.7527356.

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Schultz, Todd, Louis Cattafesta, Toshikazu Nishida, and Mark Sheplak. "Uncertainty Analysis of the Two-Microphone Method for Acoustical Impedance Testing." In 8th AIAA/CEAS Aeroacoustics Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-2465.

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Ishibashi, Takaaki, Kosuke Inoue, Chiharu Okuma, and Kei Eguchi. "Low Distortion Target Speech Extraction Method Using Two-Channel Microphone System." In The 6th IIAE International Conference on Intelligent Systems and Image Processing 2018. The Institute of Industrial Application Engineers, 2018. http://dx.doi.org/10.12792/icisip2018.078.

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Junfeng Li, Masato Akagi, and Yoiti Suzuki. "Extension of the two-microphone noise reduction method for binaural hearing aids." In 2008 International Conference on Audio, Language and Image Processing (ICALIP). IEEE, 2008. http://dx.doi.org/10.1109/icalip.2008.4590071.

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Schultz, Todd, Louis Cattafesta, and Mark Sheplak. "Comparison of the Two-Microphone Method and a Modal Decomposition Method for Acoustic Impedance Testing." In 12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-2695.

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Sacks, M. P., J. G. Kawall, R. Behboudi, and J. Buttell. "In-Duct Measurement of Gas Turbine Noise Emmisions Using a Cross Spectrum Method." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0656.

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It is often desirable to measure the sound power radiated by the inlet or exhaust of a gas turbine in an installation that includes filters and silencers. A direct measurement can only be accomplished within the empty duct between the inlet or exhaust flange and the silencer. For a number of reasons ISO 5136 [1] cannot be used directly to perform these measurements. Consequently, some other means must be found. The primary requirement for an in-duct sound power measurement is a valid in-duct sound pressure measurement. In order to accomplish this, the effect of the turbulent pressure fluctuations inherent in the flow, or induced by the microphone probes, must be removed from the dynamic pressure signals sensed by the microphone. This paper describes the use of a two-microphone cross amplitude spectrum (CAS) technique to perform accurate measurements of the autospectra of sound fields embedded in turbulent duct flows. This technique is based on the assumption that the acoustic and turbulence signals detected by any microphone are uncorrelated with each other and also with the turbulence signals detected by another microphone. The paper gives the measurement parameters required for various degrees of turbulence rejection as well as the accuracy and convergence of the estimate of the embedded acoustic spectrum. The paper also provides a means to determine the microphone separation distance required to ensure that the turbulence signals at the two microphones are uncorrelated. These results are based on both the simulation of acoustic fields embedded in turbulence and on laboratory experiments using both loudspeakers and an aeroacoustic wind tunnel. Typical results show that for practical measurement durations the proposed method will provide a turbulence rejection in octave bands of approximately 15 dB at 31.5 Hz rising smoothly to 25 dB at 8 kHz. The method thus appears to have some distinct advantages over ISO 5136 methodology.

Ishibashi, Takaaki, Kana Higuchi, Chiharu Okuma, and Kiyoteru Hayama. "Noise Reduction Method for Multiple Sound Source Signals and Its Application to Two-channel Microphone System." In International Conference on Industrial Application Engineering 2017. The Institute of Industrial Applications Engineers, 2017. http://dx.doi.org/10.12792/iciae2017.061.

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Minami, Tomoyuki, and Krishan Ahuja. "Five-Microphone Method for Separating Two Different Correlated Noise Sources from Farfield Measurements Contaminated by Extraneous Noise." In 9th AIAA/CEAS Aeroacoustics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-3261.

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Shields, Elvin B. "Impacting a Clamped-Free Beam to Experimentally and Numerically Determine Higher Resonant Frequencies of Vibration." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59044.

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Clamped-free (cantilever) beams have practical applications. For example, it is not possible to use normal means to determine the modulus of elasticity for thin films. However, the film material can be deposited onto the beam substrate by sputtering or by applying the additive manufacturing technique and thereby change the beam’s stiffness as suggested by Dias da Silva et al [1]. The stiffness change causes a shift in the natural frequencies of the vibration of the beam and this shift can be used to determine the material properties of the film. This study provides four methods of analysis: 1) formula calculation, which is used as the benchmark, 2) finite element method, 3) experimental method with accelerometer, and 4) experimental method with condenser microphone. Theoretical results are used as benchmarks and compared with the finite element method (FEM) and two experimental methods (accelerometer and condenser microphone). The challenge is to obtain results with the necessary accuracy (significant digits) at higher resonant frequencies of vibration. The two experimental methods were evaluated and the experimental method with condenser microphone showed the most promise for future work. Very little was found in the literature regarding the use of a condenser microphone to measure resonant frequencies.

Verma, Rajbir, and Sathesh Mariappan. "Comparison of Unsteady Heat Release Rate by Measurements From Chemiluminescence and Two Microphone Techniques." In ASME 2015 Gas Turbine India Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gtindia2015-1249.

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In the reaction zone of flame, electronically excited species are formed such as CH*, OH* etc. During de-excitation these radicals emit electromagnetic radiation of certain wavelength. This process is called chemiluminescence. The intensity of chemiluminescence, is in general captured using a photo multiplier tube (PMT), which is used to measure unsteady heat release rate from premixed flames. This technique is well established and is now a standard for unsteady heat release rate measurements in the parlance of combustion instability, however has certain limitations. In fuel rich mixtures, unreacted heated carbon emits broad band black body radiation, which in some cases large enough to mask the chemiluminescence signal. Hence, this technique is not valid for fuel rich conditions. Moreover, it cannot be applied, when the heat source is diffusion/partially premixed flames or electrically heated wires. We propose an alternative in this regard: two microphone technique. In this technique, we relate the acoustic velocity jump across the heat source to measure the unsteady heat release rate. The up and downstream acoustic velocity, in turn is obtained by two microphone technique. Experiments are performed in a premixed multiple flame burner at fuel lean conditions. This burner is enclosed in a duct, which acts as an acoustic resonator. Results indicate that the magnitude of the unsteady heat release rate obtained from both the techniques is found to agree within 18 %. Experiments are conducted for various lengths of the duct, thereby changing the oscillating frequency. This method is valid as long as the heat source is compact in comparison to the duct, which is true in most of the combustors during combustion instability and is irrespective of its type.