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Characteristics Analysis of Joint Acoustic Echo and Noise Suppression in Periodic Drillstring Waveguide
2014
Shock and Vibration
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in a periodic pipe structure of limited length to investigate the effects on transmission performance optimization. ...
A combined acoustic echo and noise suppression method based on wave motion characteristic in drillstring is adopted to enhance an upward-going transmitted acoustic signal. ...
Acknowledgments The authors thank the National Natural Science Foundation of China (nos. 50905095, 61121003) and Changjiang Scholars and Innovative Research Team in University for supporting this research ...
doi:10.1155/2014/741314
fatcat:ywlfn572uvep7j6r77aqvb3qtq
Machinery Noise and Diagnostics
1989
Journal of Vibration and Acoustics
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Then, we encounter the sound power in a reverberating room plus the procedure of employing reciprocity to measure sound radiation in a small reverberation chamber. ...
We now venture forth in expanding the phases in one-dimensional acoustic pipe and twodimensional rectangular rooms. ...
Acoustics, Stress Analysis and Reliability in Design, should have been included. A number of excellent papers have been published in our journal. ...
doi:10.1115/1.3269892
fatcat:nocjvtccajdlhaazzsuofg7b5q
Through-Metal-Wall Power Delivery and Data Transmission for Enclosed Sensors: A Review
2015
Sensors
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Using such technologies sensors enclosed in hermetical metal containers can be powered and communicate through exterior power sources without penetration of the metal wall for wire feed-throughs. ...
and/or data transmission methods; (3) compare various ultrasonic through-metal-wall systems in modeling, transducer configuration and communication mode with sensors; (4) summarize the characteristics ...
A sinusoidal voltage is applied across the transmitting transducer at a known frequency generating an ultrasonic wave that travel through the wall into the receiving transducer where the stress wave generates ...
doi:10.3390/s151229870
pmid:26694392
pmcid:PMC4721790
fatcat:qrpyundanfgjnlfnp3gg5k5fxm
Daniel R. Raichel: The Science and Applications of Acoustics
2001
Computer Music Journal
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except for brief excerpts in connection with reviews or scholarly analysis. ...
Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed is forbidden. ...
Volume is 602,000 ft 3 ; seating capacity 2631; and the reverberation time in the 500-1000 Hz range is 1.8 s (occupied). ...
doi:10.1162/comj.2001.25.4.92
fatcat:o3u27vcdpbbdtaqanqrerx2tii
Estimating the size and spatial distribution of bubble clouds in an underwater acoustic test tank
2010
Journal of the Acoustical Society of America
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With postanalysis this results in time-dependent positions for each of the acoustic sensors. Every channel is calibrated. ...
In our work, we also study ducting and refracting due to idealized curved sea bottom ripples. Previous research has shown that non-linear internal waves can also create acoustical ducts. ...
Multiple-input/multiple-output ͑MIMO͒ systems can deliver significant increased channel capacity for underwater communications. ...
doi:10.1121/1.3384193
fatcat:hbesn7bgzbhvfjiy4sewacwaxe
The specificity of sensorimotor learning: Generalization in auditory feedback adaptation
2007
Journal of the Acoustical Society of America
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This information is often used to conveniently assess the speech intelligibility of a communications channel. ...
the absence of a pipe resonator. ...
These include the important role of coherent effects in determining reverberation structure at short ranges, and the important role of boundary reflection loss in affecting the reverberation level at long ...
doi:10.1121/1.2942959
fatcat:v6krgm45ozahjjzsaash3d6dkm
Extracting vowel characteristics from smoothed spectra
2000
Journal of the Acoustical Society of America
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Phase-shifted keying modulation schemes offer an efficient use of signal power for a given bandwidth in a communication channel. ...
Of the various wave types, the LCR is most sensitive to stress and least sensitive to texture. ...
As networked information systems increase in complexity, natural modes of communication assume a greater role in the design of human-machine interfaces. ...
doi:10.1121/1.4743686
fatcat:i5lv7vu575hyjaezn5pllmxyyu
Acoustofluidics: Theory and simulation of streaming and radiation forces at ultrasound resonances in microfluidic devices
2009
Journal of the Acoustical Society of America
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Modeling differential frequency hopping communication in the underwater acoustic channel. Luca Cazzanti, Julia Hsieh ͑Appl. Phys. ...
Peaks tend to be higher in 4-pre-stressed-syllable words and be absent in 2-pre-stressed-syllable words. ...
Examples will be given from some of these studies to show progress in the field. Much of the underwater acoustic community that has worked with ray theory starts from the eikonal-ray equations. ...
doi:10.1121/1.4783855
fatcat:cyftnzsenzempdbtk4dd2hzw5u
Ultrasonic defectoscopy
1969
Ultrasonics
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When the latter propagate in the pipe wal 1 this wall radiates into the liquid 1>ngitudlnal waves which are trapped by receiving head 11, When there is a defect in the controlled section of pipe (in welaed ...
In accordance with this, the circuit of the signalling apparatus contains two independent channels: channel for bottom echo and channel for echo from defect. ...
doi:10.1016/0041-624x(69)90419-3
fatcat:dgzinv57cbht5knv7i4fqyfycq
New ISO standards for hearing protectors
2000
Journal of the Acoustical Society of America
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Phase-shifted keying modulation schemes offer an efficient use of signal power for a given bandwidth in a communication channel. ...
Of the various wave types, the LCR is most sensitive to stress and least sensitive to texture. ...
The scattered beams from the detection array are then collected and combined with a single reference beam in a photorefractive crystal in a multiplexed two-wave mixing configuration. ...
doi:10.1121/1.4743748
fatcat:tzupe2dywvdlba4cl35xczgrqq
Performance of optimized sound field control techniques in simulated and real acoustic environments
2012
Journal of the Acoustical Society of America
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Hospital patients, staff, and visitors need healthy soundscapes: patients need to sleep and heal without stress; staff, patients and family need to communicate accurately but privately; staff need to hear ...
Unfortunately, many hospitals are noisy and stressful places. ...
A pipe-like one-way structure of acoustic wave. ...
doi:10.1121/1.4709059
fatcat:5yv7djzdifgwvlzymric4u65oa
Effects of errorless learning on the acquisition of velopharyngeal movement control
2012
Journal of the Acoustical Society of America
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The SIR provides a local description of the reverberant field of that environment as a function of both time and space. ...
It is shown that, under given assumptions, the SIR can be described by means of an integral operator, the so-called Herglotz wave function, which represents an infinite superposition of plane waves arriving ...
In the mid-frequency band (3 kHz -20 k Hz) and at relatively short ranges (order 10 water depths) in reverberant channels, gravity waves focus sound energy incident on the sea surface, creating intensifications ...
doi:10.1121/1.4708235
fatcat:7wzupz5u2nd6nc7ttvbpxwvunm
The role of spectral cues and minimum bandwidth in the auditory perception of distance
2010
Journal of the Acoustical Society of America
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The sample fluid is assumed to be homogeneous so that the wave propagation characteristics in a micro-channel can be used for measurement. ...
In this paper, the theory of why the striations appear in the spectrograms of the reverberation is briefly reviewed, and the extraction of channel and scatterer information from the time-frequency content ...
doi:10.1121/1.3508786
fatcat:wcm45muntjfybnrlv2hrxcjsgq
Waterborne noise due to ocean thermal energy conversion plants
1983
Journal of the Acoustical Society of America
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There was no indication from the measured data that pipe resonances, or channeling of the sound by the pipe occurred. ...
where Cf' is the local boundary-layer wall shear stress coefficient which is a function of the Reynolds number defined in terms of the local boundary 17 layer displacement thickness . in a smooth pipe ...
doi:10.1121/1.389718
fatcat:jkuci7wocfh3pkg3dh7qipvhpe
Abstracts and Notices from the Scientific and Technical Press
1935
Journal of the Royal Aeronautical Society
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The field of stress in a body is affected by heterogeneity and local peaks of stress may produce slip in a metal before general flow sets in. ...
Records are shown of a distorted sine curve and of the pure sine wave obtained by this method of correction. Four references.
Seventy-five Centimetre Radio Communication Tests. (W. D. ...
The method has applications to correlation of deviations in different series of target records in which there are two main sources of error. Four references. ...
doi:10.1017/s0368393100111770
fatcat:ybhtmjttcnahnmtywxuad5tvtq
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