Relevant bibliographies by topics / Acoustic directivity acquisition system

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Acoustic directivity acquisition system'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Acoustic directivity acquisition system"

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Malarkodi, Amirthalingam, Peddinti SSR Sridhar, and Ganesan Latha. "Development of Automated Measurement Setup for Characterizing Underwater Acoustic Transducers." Marine Technology Society Journal 50, no. 6 (November 1, 2016): 69–75. http://dx.doi.org/10.4031/mtsj.50.6.9.

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AbstractAccurate determination of sensitivity and directivity is important for any underwater acoustic transducer. In this work, an automatic measuring platform was designed and implemented for characterizing underwater acoustic transducers. The overall hardware setup includes a PXI (PCI Extensions for Instrumentation)-based data acquisition system, computer-based controller module, motion controller module, and LabVIEW-based automatic calibration program. The system performs a sequence of operations automatically and achieves synchronous control of transmission and acquisition of real-time acoustic signals as well as processing, recording, and report generation. This measurement platform can be utilized for characterizing any type of acoustic transducer for its receiving sensitivity, transmitting response, and directivity measurement as per IEC60565 standard. The measurement results for RESON TC4034 and RESON TC 2080 transducers are presented and the results show that the system is able to carry out accurate calibration and characterization of any underwater acoustic transducer. Sources of uncertainty for calibration are also presented with the confidence level of approximately 95%.
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Wei, Zhou-Tuo, and Xiao-Ming Tang. "Numerical simulation of radiation, reflection, and reception of elastic waves from a borehole dipole source." GEOPHYSICS 77, no. 6 (November 1, 2012): D253—D261. http://dx.doi.org/10.1190/geo2012-0061.1.

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A recent advance in single-well reflection imaging is the use of a dipole acoustic system in a borehole to radiate and receive elastic waves to and from a remote geologic reflector in formation. This dipole-acoustic imaging technology is evaluated by numerically simulating the radiation and reflection of the wavefield generated by the borehole dipole source and analyzing the receiving sensitivity of the dipole system to the incoming reflected waves. The analyses show that a borehole dipole source can radiate a compressional wave (P-wave) and two types of shear waves (i.e., SV- and SH-waves) into the formation. The SH-wave has wide radiation coverage and the best receiving sensitivity, and is most suitable for dipole-shear imaging. In an acoustically slow formation, the dipole-generated P-wave has strong receiving sensitivity and can also be used for reflection imaging. An important feature of dipole imaging is its sensitivity to reflector azimuth, which results from the directivity of the dipole source. By using a 4C data acquisition method to record the dipole-generated reflected signal, the reflector azimuth can be determined. The numerical simulation and theoretical analysis results are in good agreement, providing a solid foundation for the dipole acoustic imaging technology.
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Zhong, Yu, and Yangting Liu. "Source-independent time-domain vector-acoustic full-waveform inversion." GEOPHYSICS 84, no. 4 (July 1, 2019): R489—R505. http://dx.doi.org/10.1190/geo2018-0304.1.

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Dual-sensor seismic acquisition systems that record the pressure and particle velocity allow the recording of the full-vector-acoustic (VA) wavefields. Most previous studies have focused on data-domain processing methods based on VA seismic data; whereas, few studies focused on using full-VA seismic data in full-waveform inversion (FWI). Conventional acoustic FWI only takes advantage of the pressure recordings to estimate the medium’s velocity model. Some artifact events will appear in the adjoint-state wavefields based on the conventional acoustic FWI method. These artifact events further reduce the accuracy of acoustic FWI. To simultaneously use pressure and vertical particle velocity recordings, we introduced a new time-domain VA FWI method. The VA FWI method can take advantage of directivity information contained in the VA seismic data. Thus, the adjoint-state wavefields based on VA FWI are more accurate than those from the conventional acoustic FWI method. In addition, we applied a convolution-based objective function to eliminate the effects of the source wavelet and implement a time-domain multiscale strategy in VA FWI. Synthetic examples are presented to demonstrate that VA FWI can improve the accuracy of acoustic FWI in the presence and absence of a free surface in the acoustic case. In addition, VA FWI does not significantly increase the computation and memory costs, but it has better convergence when compared with conventional acoustic FWI.
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Adachi, Ahoro, and Hiroyuki Hashiguchi. "Application of parametric speakers to radio acoustic sounding system." Atmospheric Measurement Techniques 12, no. 10 (October 28, 2019): 5699–715. http://dx.doi.org/10.5194/amt-12-5699-2019.

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Abstract. In this study, a wind profiler with a radio acoustic sounding system (RASS) and operational radiosonde measurements were used to investigate the technical practicability and reliability of using parametric speakers to measure the vertical profile of virtual temperature. Characteristics of parametric speakers include high directivity and very low side lobes, which are preferable for RASS, especially those operating in urban areas. The experiments were conducted on fine days with light winds to mitigate the effects of the horizontal and vertical components of wind on acoustic waves used for RASS. The results of this study indicated that, although parametric speaker RASS is susceptible to horizontal winds due to the narrower acoustic beam, bias and standard deviation of parametric speaker RASS versus radiosonde virtual temperature difference (0.1 ∘C, 0.4 ∘C) were close to those from acoustic speakers (0.0 ∘C, 0.4 ∘C). In addition, when compared with acoustic speaker RASS, the values for the parametric speaker RASS were even smaller (0.1 ∘C, 0.2 ∘C). Based on these results, it is concluded that the parametric speaker RASS has accuracy and precision comparable with acoustic speaker RASS despite its high directivity of sound.
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Cheng, Yue, Anbang Zhao, Juan Hui, Tiansi An, and Bin Zhou. "Parametric Underwater Transmission Based on Pattern Time Delay Shift Coding System." Mathematical Problems in Engineering 2018 (December 26, 2018): 1–7. http://dx.doi.org/10.1155/2018/8249245.

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The technique of pattern time delay shift coding (PDS) underwater acoustic (UWA) communication based on parametric array is presented in this paper, which is easy to be implemented and robust in the spatiotemporal variable ocean environment. The parametric array can generate low-frequency, broadband, and high-directivity beam with small-aperture. The high directivity reduces the impact of time variant characteristics of UWA channel especially multipath effects and improves the reuse rate of underwater acoustic channel at the same time. The wide bandwidth allows high rate communications. The sea trial results show that it can be employed to combat multipath propagation in shallow water and achieve very low bit error rate (BER). The theoretical research and sea trial verify the feasibility and effectiveness of the proposed UWA method.
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Vijay Yeole, Gaurav, and Sagar Ramchandra Shinde. "Acoustic Emission Signal Analysis using Data Acquisition System." International Journal of Engineering Trends and Technology 11, no. 8 (May 25, 2014): 384–87. http://dx.doi.org/10.14445/22315381/ijett-v11p275.

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Welch, John R. "System and method for calculating the directivity index of a passive acoustic array." Journal of the Acoustical Society of America 126, no. 2 (2009): 927. http://dx.doi.org/10.1121/1.3204321.

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You, Ting, Pei Jiang Li, Guan Jun Tong, and Jian Wei Shen. "Development of Acoustic Emission High-Speed Data Acquisition System." Advanced Materials Research 433-440 (January 2012): 5666–71. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.5666.

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Acoustic emission is generally high-frequency signal with the characteristics of broadband and burstiness, so it is very difficult to acquire acoustic emission signal in real time as well as rapidly, In this paper, an USB based acquisition system for acoustic emission signal is designed, which adopts CPLD as controller and uses two high-speed A/D converters to achieve synchronous acquisition of two-channel acoustic emission signals, The system first puts collected data into a FIFO and then transfers data to host through USB using CY7C68013, The sampling frequency of the system is up to 10MHz and the transmission rate of USB is 40M/S, Hard body impact test and lead-breaking test indicate that the system can achieve real-time acquisition of acoustic emission signal well,
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Qu, Ke, Binbin Zou, Jingjing Chen, Yingge Guo, and Runtian Wang. "Experimental Study of a Broadband Parametric Acoustic Array for Sub-Bottom Profiling in Shallow Water." Shock and Vibration 2018 (December 25, 2018): 1–8. http://dx.doi.org/10.1155/2018/3619257.

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Broadband parametric acoustic arrays appear to offer advantages for shallow water sub-bottom profiling. In this paper, the performance of a broadband parametric acoustic array system was experimentally evaluated. In tank experiments using the nonlinear parabolic wave (KZK) equation, the directivity, source level, parametric acoustic array length, and penetration depth were evaluated. Based on Berktay’s far-field solution, the system’s emission signal was designed. According to sea trials of the broadband parametric acoustic array system as designed, a clear sub-bottom profile was obtained. Moreover, buried pipelines in the seabed were effectively detected, verifying the system’s effectiveness.
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Wang, Tian, Meihui Gong, Xiaoyu Yu, Guangdong Lan, and Yunbo Shi. "Acoustic-pressure sensor array system for cardiac-sound acquisition." Biomedical Signal Processing and Control 69 (August 2021): 102836. http://dx.doi.org/10.1016/j.bspc.2021.102836.

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Dissertations / Theses on the topic "Acoustic directivity acquisition system"

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Eyring, Nicholas J. "Development and Validation of an Automated Directivity Acquisition System Used in the Acquisition, Processing, and Presentation of the Acoustic Far-Field Directivity of Musical Instruments in an Anechoic Space." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4004.

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A high spatial resolution acoustic directivity acquisition system (ADAS) has been developed to acquire anechoic measurements of the far field radiation of musical instruments that are either remote controlled or played by musicians. Building upon work performed by the BYU Acoustic Research Group in the characterization of loudspeaker directivity, one can rotate a musical instrument with sequential azimuthal angle increments under a fixed semicircular array of microphones while recording repeated notes or sequences of notes. This results in highly detailed and instructive directivity data presented in the form of high-resolution balloon plots. The directivity data and corresponding balloon plots may be shown to vary as functions of time or frequency. This thesis outlines the development of a prototype ADAS and its application to different sources including loudspeakers, a concert grand piano, trombone, flute, and violin. The development of a method of compensating for variations in the played amplitude at subsequent measurement positions using a near-field reference microphone and Frequency Response Functions (FRF) is presented along with the results of its experimental validation. This validation involves a loudspeaker, with known directivity, to simulate a live musician. It radiates both idealized signals and anechoic recordings of musical instruments with random variations in amplitude. The concept of coherence balloon maps and surface averaged coherence are introduced as tools to establish directivity confidence. The method of creating composite directivities for musical instruments is also introduced. A composite directivity comes from combining the directivities of all played partials to approximate what the equivalent directivity from a musical instrument would be if full spectral excitation could be used. The composite directivities are derived from an iterative averaging process that uses coherence as an inclusion criterion. Sample directivity results and discussions of experimental considerations of the piano, trombone, flute, and violin are presented. The research conducted is preliminary and will be further developed by future students to expand and refine the methods presented here.
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Bodon, K. Joshua. "Development, Evaluation, and Validation of a High-Resolution Directivity Measurement System for Played Musical Instruments." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5653.

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A high-resolution directivity measurement system at Brigham Young University has been renovated and upgraded. Acoustical treatments have been installed on the microphone array, professional-grade audio hardware and cabling have been utilized, and user-friendly MATLAB processing and plotting codes have been developed. The directivities of 16 played musical instruments and several loudspeakers have been measured by the system, processed, and plotted. Using loudspeakers as simulated musicians, a comprehensive analysis was completed to validate the system and understand its error bounds. A comparison and evaluation of repeated-capture to single-capture spherical systems was made to demonstrate the high level of detail provided by the 5 degree resolution system. Analysis is undertaken to determine how nonanechoic effects in anechoic chambers influence results. An overview of directivity measurement systems from the literature is provided as well as a dedicated discussion of the directivity measurement system at Brigham Young University.
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Dong, Peiliang. "On-chip ultra-fast data acquisition system for optical scanning acoustic microscopy using 0.35um CMOS technology." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10667/.

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Optical Scanning Acoustic Microscopy (OSAM) is a non-contacting method of investigating the properties and hidden faults of solid materials. This thesis presents an ultra-fast data acquisition system (DAQ) which samples and digitises the output signal of OSAM. The author's work includes the design of the clock source and the sampler, and integration of the whole system. The clock source is a unique pulse generator based on a 2.624GHz PLL with a Quadrature VCO (QVCO), which is able to generate 4 clock signals in accurate quadrature phase difference. The pulse generator used the 4-phase clocks to provide control pulses to the sampler. The pulses were carefully aligned to the clock edges by digital logic, so that jitters were reduced as much as possible. The required short time delay for the sampler was also provided by the pulse generator, and this was implemented by a smartly-controlled switch box which re-shuffles the 4-phase clocks. The presented sampler is a novel 10.496GSample/s Sub-Sampling Sample-and-Hold Amplifier (SHA). The SHA sampled the input, and transformed its spectrum down to a low-frequency range so that it can be digitised. Charge-domain sampling strategy and double differential switches were both developed in this circuit to significantly improve the sampling speed. The periodicity of the system input was exploited in repetitive sampling to reduce the noise. These designed modules were integrated into a DAQ for a 2x8 sensor array. A pseudo-parallel scanning strategy was presented to minimise the power consumption, and a current-based buffer was applied to deliver the control pulses into the array. The DAQ was implemented on-chip in a low-cost 0.35um standard CMOS process. The measurement results showed that the DAQ successfully achieved a sampling rate more than 10GS/s, with a maximum output resolution of approximately 6 bits.
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Roth, Brian D. "Acoustic source and data acquisition system for a helicopter rotor blade-vortex interaction (BVI) noise reduction experiment." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA326229.

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Thesis (M.S. in Engineering Acoustics) Naval Postgraduate School, December 1996.
"December 1996." Thesis advisor(s): Robert M. Keolian, Steven R. Baker. Includes bibliographical references (p. 59). Also available online.
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SHINDE, VISHAL. "DEVELOPMENT OF A DATA ACQUISITION SYSTEM AND PIEZOELECTRIC SENSORS FOR AN EXPERIMENTAL STRUCTURAL NEURAL SYSTEM." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1143842747.

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Lardies, Joseph. "Etude d'antennes acoustiques a directivite constante sur une large bande." Toulouse 3, 1987. http://www.theses.fr/1987TOU30214.

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Cette etude porte sur la conception et la realisation d'antennes acoustiques a largeur de faisceau constante sur une large bande. On examine deux techniques, dont l'une est basee sur un reseau d'antennes maintenant la largeur du lobe principal constant sur plusieurs octaves, tandis que l'autre methode permet de maintenir la largeur du faisceau d'une antenne constante sur plusieurs octaves. Etude de l'estimation de la direction et de la puissance de signaux acoustiques en vue d'applications possibles
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Gustavsson, Lisa. "The language learning infant : effects of speech input, vocal output, and feedback /." Doctoral thesis, Stockholm : Department of Linguistics, Stockholm University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-26735.

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HUANG, SHIH-REN, and 黃士人. "Development for DSP System in Acoustic Signal Acquisition and Analyzer." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/51621327694349912424.

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碩士
正修科技大學
機電工程研究所
96
The digital signal processing (DSP) technology has been developed rapidly due to the widespread applications of high technology, the delicate division of labor, and the severe requirements for systems. The DSP system has many good characteristics such as high degree of precision, high stability and agility, high integrated ability, and good interface. Nowadays, DSP chips have been widely applied in the developments of various equipments and apparatus. This thesis uses a DSP chip, TMS320C5402, to develop an acoustic signal analyzing system. Numerical results show that by applying the DSP chip to retrieve acoustic signals, the functions of the developed system are becoming more and more completed. The thesis has fulfill the following works: discussing the important meanings and recent progress of the acoustic signal measuring and analyzing system applying to industrial production, explaining basic principles of acoustic signal acquisition system, introducing the developed progress of the DSP system, theories of processing digital signals, and the steps of realization, describing the functions and characteristics of DSP chip, software development environment CCS(Code Computer Studio), depicting the characteristics and designing methods of TMS320C5402 chip which is the product of TI company, and utilizing the FFT technology to process signals on DSP.
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Tzung-MingYang and 楊宗明. "Development of a Numerical Algorithm for Acoustic Data Acquisition System via an Electret Condenser Microphone." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/62491179803894607536.

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Books on the topic "Acoustic directivity acquisition system"

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Stevens, C. R. A hydroacoustic data acquisition system (HYDAS) for the collection of acoustic data from fish stocks. St. John's, Nfld: Science Branch, Dept. of Fisheries and Oceans, 1986.

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Acoustic source and data acquisition system for a helicopter rotor blade-vortex interaction (BVI) noise reduction experiment. Monterey, Calif: Naval Postgraduate School, 1996.

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Acoustic Source and Data Acquisition System for a Helicopter Rotor Blade-Vortex Interaction (BVI) Noise Reduction Experiment. Storming Media, 1996.

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Book chapters on the topic "Acoustic directivity acquisition system"

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Mukherjee, Arpita, Abhishek Maurya, Pratap Karmakar, and Partha Bhattacharjee. "Internet of Things Based Data Acquisition System of Acoustic Emission Sensor for Structural Health Monitoring Applications." In Intelligent Data Communication Technologies and Internet of Things, 139–46. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-34080-3_16.

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Martina, Francesco, Yonas Muanenda, Stefano Faralli, and Fabrizio Di Pasquale. "An FPGA-Based Real-Time Acquisition System for a Distributed Acoustic Sensor Based on Φ-OTDR." In Lecture Notes in Electrical Engineering, 415–20. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11973-7_49.

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Allotta, Benedetto, Riccardo Costanzi, Massimo Magrini, Niccoló Monni, Davide Moroni, Maria Antonietta Pascali, Marco Reggiannini, Alessandro Ridolfi, Ovidio Salvetti, and Marco Tampucci. "Towards a Robust System Helping Underwater Archaeologists Through the Acquisition of Geo-referenced Optical and Acoustic Data." In Lecture Notes in Computer Science, 253–62. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20904-3_24.

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Kim, Chang Wan, Min Ho Lee, and Sang Hwa Jung. "An Advanced Discharge Measurement Technique: Real-Time Automatic Discharge Acquisition Remote-Control System Using Acoustic Doppler Velocity Meters." In Advances in Water Resources and Hydraulic Engineering, 1978–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_339.

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Spain, Lucy, and David Cheneler. "Acoustic Monitoring of Joint Health." In Data Acquisition - Recent Advances and Applications in Biomedical Engineering. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.92868.

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The joints of the human body, especially the knees, are continually exposed to varying loads as a person goes about their day. These loads may contribute to damage to tissues including cartilage and the development of degenerative medical conditions such as osteoarthritis (OA). The most commonly used method currently for classifying the severity of knee OA is the Kellgren and Lawrence system, whereby a grade (a KL score) from 0 to 4 is determined based on the radiographic evidence. However, radiography cannot directly depict cartilage damage, and there is low inter-observer precision with this method. As such, there has been a significant activity to find non-invasive and radiation-free methods to quantify OA, in order to facilitate the diagnosis and the appropriate course of medical action and to validate the development of therapies in a research or clinical setting. A number of different teams have noted that variation in knee joint sounds during different loading conditions may be indicative of structural changes within the knee potentially linked to OA. Here we will review the use of acoustic methods, such as acoustic Emission (AE) and vibroarthrography (VAG), developed for the monitoring of knee OA, with a focus on the issues surrounding data collection and analysis.
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Juarez, Juan H., Marco A. Moreno, and Miguel J. Torres-Ruiz. "GIS Approach for Collaborative Monitoring and Prediction of Environmental Noise in Urban Areas." In Environmental Information Systems, 1510–36. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7033-2.ch069.

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Environmental noise, as well as being a form of environmental pollution that affects mainly urban areas, it is a problem that involves people's quality of life. This paper presents a methodology that takes advantage of the Volunteered Geographic Information (VGI) in obtaining georeferenced environmental noise maps and the corresponding statistics for a particular area of interest. The methodology herein presented considers the phases of Data acquisition, Analysis and data processing, and Visualization of the information. The design and development of a Geographic Information System is presented, which consists of a web mapping application, an application for mobile devices, called NoiseMonitor, Geospatial Analysis and Machine Learning methods (Support Vector Machines and Artificial Neural Networks) for acoustic noise prediction using contextual information, that is, some factors around the measurements. A study case is based on Mexico City.
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Friederici, Angela D., and Noam Chomsky. "Ontogeny of the Neural Language Network." In Language in Our Brain. The MIT Press, 2017. http://dx.doi.org/10.7551/mitpress/9780262036924.003.0007.

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This chapter reviews the neural underpinning of normal language acquisition and asks not only at which age certain milestones in language acquisition are achieved, but moreover to what extent is this achievement dependent on the maturation of particular brain structures. In our recent model, the neural basis of the developing language system is described to reflect two major phases. The available data provide consistent evidence that very early on an infant is able to extract language-relevant information from the acoustic input. This first phase covers the first three years of life when language processing is largely input-driven and supported by the temporal cortex and the ventral part of the network. A second phase extends beyond age 3, when top-down processes come into play, and the left inferior frontal cortex and the dorsal part of the language network are recruited to a larger extent. Development towards full language performance beyond age 3 is dependent on maturational changes in the gray and white matter. An increased language ability is correlated with an increase in structural and functional connectivity between language-related brain regions in the left hemisphere, the inferior frontal gyrus and the posterior superior temporal gyrus/superior temporal sulcus.
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S., Vidhya, and Sharmila Nageswaran. "Medical Signal Processing." In Advances in Medical Technologies and Clinical Practice, 81–103. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8018-9.ch006.

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This chapter introduces sleep, the pattern of sleep, wakefulness, disorders associated with sleep, diseases of heart and lungs that can be identified by analysing one's sleep. Sleep is generally equated to the neurological system and the brain. It is believed that sleep can be identified only with EEG. This chapter also explores the usage of EEG in detecting the disorders associated with sleep, and more emphasis is given to the bio signals other than EEG, which includes ECG, PPG, acoustic signals that can be used in understanding the sleep and its related disorders. It explains the biomedical devices that are used for sleep-related studies. This chapter explores the stages of sleep signal processing where the authors have suggested how to reduce noises at the stage of data acquisition. Further topics explore various signal processing methods that need to be adapted in various stages, namely preprocessing, filtering, feature extraction, validation, and automated processing.
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Conference papers on the topic "Acoustic directivity acquisition system"

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Blake, William K., and Paul Donovan. "A New Road-Side Array-Based Method for Characterization of Truck Noise During Passby." In ASME 2008 Noise Control and Acoustics Division Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ncad2008-73055.

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This paper describes the development of a new method for measuring pass-by sound from trucks and other vehicles using 2-dimensional arrays. The approach provides 2-dimensional quantitative maps “images” of the cross-range and elevation distribution in the vehicle side view. The method is an application and extension of an array technology that was originally used for the characterization of static aeroacoustic sources in wind tunnels. The focus of this work is on identifying and rank-ordering the important contributing sources of passby noise. This development includes two phases: developmental testing at a test track site, and road-side testing at two California State highway sites. The acquisition post-processing allows the “observer” to track the vehicle cross-range in order to create a time sequence of source maps that may be interpreted as both level relationships and directivity patterns. The processing applies both range and approximate Doppler adjustments to spectra as a function of time during pass-by or, equivalently, to vehicle position relative to the array’s center. An image demodulation scheme is shown to clarify the images. The initial phase of this work occurred at a test track using known “cooperative” truck sources. This experience permitted the verification of the method and the definition of a final measurement approach that was viable at a highway site. Subjects were all trucks that varied in model, vehicle speed, tread, and the presence of a trailer. The array beamformer’s ability to localize and the measurement system’s ability to track were validated using both stationary and moving sources. Following validation at the test track site, the instrumentation was transferred to two California highway sites. There, acoustic calibration was used to align the array with the road track and to provide a spatial reference for mapping the “images”. Both light and heavy vehicles at these sites were “uncooperative” with arrivals and speeds randomly determined by traffic flow. This work was funded by the California Department of Transportation.
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Sridhar, P. S. S. R., A. Malarkodi, K. Nithyanandam, and G. Latha. "Development of directivity measurement system for underwater acoustic transducers." In 2015 International Symposium on Ocean Electronics (SYMPOL). IEEE, 2015. http://dx.doi.org/10.1109/sympol.2015.7581170.

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Lin, Xi-Zhou, En Cheng, and Fei Yuan. "A data acquisition system for underwater acoustic communication system." In 2010 International Conference On Computer and Communication Technologies in Agriculture Engineering (CCTAE). IEEE, 2010. http://dx.doi.org/10.1109/cctae.2010.5544376.

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Zimmerman, A. T., and J. P. Lynch. "A wireless data acquisition system for acoustic emission testing." In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: VOLUME 32. AIP, 2013. http://dx.doi.org/10.1063/1.4789234.

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de Moustier, C., and F. V. Pavlicek. "A Fully Transportable Sea Beam Complex Acoustic Data Acquisition System." In Offshore Technology Conference. Offshore Technology Conference, 1987. http://dx.doi.org/10.4043/5514-ms.

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Guo, Chen, and Shi Junchao. "Design of power supply for portable acoustic shock acquisition system." In 2016 International Conference on Audio, Language and Image Processing (ICALIP). IEEE, 2016. http://dx.doi.org/10.1109/icalip.2016.7846569.

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Ji, Zhong, and Yongsheng Cui. "Real-Time Data Acquisition System for Radiation-induced Acoustic Imaging." In International Conference on Photonics and Imaging in Biology and Medicine. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/pibm.2017.w3a.70.

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Ma, Qingfeng, Hui Liu, Hao Cui, and Xu Xiang. "An Improved Multi-threading Data Acquisition System of Acoustic Signal." In 2nd International Conference on Computer Application and System Modeling. Paris, France: Atlantis Press, 2012. http://dx.doi.org/10.2991/iccasm.2012.388.

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Skinner, J. D., G. L. Edmonds, D. E. Ensberg, G. L. D'Spain, and W. S. Hodgkiss. "A high-speed acoustic data acquisition system using mostly COTS components." In Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492). IEEE, 2003. http://dx.doi.org/10.1109/oceans.2003.178320.

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Yan, Jingwen, Tianli Li, Jie Chen, Dehang Huang, Yongxiang Tao, and Suiwen Lv. "Design of wireless acoustic emission data acquisition system based on FPGA." In 2019 3rd International Conference on Electronic Information Technology and Computer Engineering (EITCE). IEEE, 2019. http://dx.doi.org/10.1109/eitce47263.2019.9095186.

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Reports on the topic "Acoustic directivity acquisition system"

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Schomer, Paul D. Acoustic Directivity Patterns for Army Weapons. Supplement 4. The Multiple Launch Rocket System. Fort Belvoir, VA: Defense Technical Information Center, February 1986. http://dx.doi.org/10.21236/ada166490.

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Hart, Carl R., and Gregory W. Lyons. A Measurement System for the Study of Nonlinear Propagation Through Arrays of Scatterers. Engineer Research and Development Center (U.S.), November 2020. http://dx.doi.org/10.21079/11681/38621.

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Abstract:
Various experimental challenges exist in measuring the spatial and temporal field of a nonlinear acoustic pulse propagating through an array of scatterers. Probe interference and undesirable high-frequency response plague typical approaches with acoustic microphones, which are also limited to resolving the pressure field at a single position. Measurements made with optical methods do not have such drawbacks, and schlieren measurements are particularly well suited to measuring both the spatial and temporal evolution of nonlinear pulse propagation in an array of scatterers. Herein, a measurement system is described based on a z-type schlieren setup, which is suitable for measuring axisymmetric phenomena and visualizing weak shock propagation. In order to reduce directivity and initiate nearly spherically-symmetric propagation, laser induced breakdown serves as the source for the nonlinear pulse. A key component of the schlieren system is a standard schliere, which allows quantitative schlieren measurements to be performed. Sizing of the standard schliere is aided by generating estimates of the expected light refraction from the nonlinear pulse, by way of the forward Abel transform. Finally, considerations for experimental sequencing, image capture, and a reconfigurable rod array designed to minimize spurious wave interactions are specified. 15.
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