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Acoustics research letters online : ARLO最新文献

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A time-reversal mirror in a solid circular waveguide using a single, time-reversal element 使用单个时间反转元件的固体圆波导中的时间反转镜
Acoustics research letters online : ARLO Pub Date : 2003-01-27 DOI: 10.1121/1.1558377
A. Puckett, M. Peterson
{"title":"A time-reversal mirror in a solid circular waveguide using a single, time-reversal element","authors":"A. Puckett, M. Peterson","doi":"10.1121/1.1558377","DOIUrl":"https://doi.org/10.1121/1.1558377","url":null,"abstract":"The ability of a single acoustic element to produce a compact time domain signal from a multi-mode solid cylindrical waveguide using a time-reversal mirror (TRM) is considered. Two, single element, longitudinal contact transducers were used to excite and receive multiple longitudinal modes in a fused quartz waveguide in a TRM experiment. The TRM is demonstrated to be effective with the limited information from a single longitudinal transducer. Experimental results are presented along with a simple interpretation that shows how a TRM with only a single element can be used as a practical sensor.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73594319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Evasive responses of American shad (Alosa sapidissima) to ultrasonic stimuli 美洲凤尾鱼对超声刺激的躲避反应
Acoustics research letters online : ARLO Pub Date : 2003-01-27 DOI: 10.1121/1.1558376
D. Plachta, A. Popper
{"title":"Evasive responses of American shad (Alosa sapidissima) to ultrasonic stimuli","authors":"D. Plachta, A. Popper","doi":"10.1121/1.1558376","DOIUrl":"https://doi.org/10.1121/1.1558376","url":null,"abstract":"Many species of odontocete cetaceans (toothed whales) use high frequency clicks (60–170 kHz) to identify objects in their environment, including potential prey. Behavior and physiological studies have shown that American shad, Alosa sapidissima, can detect ultrasonic signals to at least 180 kHz. This study demonstrates that freely swimming, American shad show a variety of behaviors in response to pure tone, ultrasonic stimulation. This response depends primarily on stimulus amplitude and, to a lesser degree, on stimulus frequency, direction and duration.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1121/1.1558376","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72416368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 55
Sound transmission in the spermaceti complex of a recently expired sperm whale calf 最近死亡的抹香鲸幼崽的精脑复合体中的声音传输
Acoustics research letters online : ARLO Pub Date : 2003-01-01 DOI: 10.1121/1.1538390
B. Møhl, P. Madsen, M. Wahlberg, W. Au, P. E. Nachtigall, S. Ridgway
{"title":"Sound transmission in the spermaceti complex of a recently expired sperm whale calf","authors":"B. Møhl, P. Madsen, M. Wahlberg, W. Au, P. E. Nachtigall, S. Ridgway","doi":"10.1121/1.1538390","DOIUrl":"https://doi.org/10.1121/1.1538390","url":null,"abstract":"Sound pulses were projected into the forehead of a neonate, female sperm whale that died following a stranding and attempts to revive it. Two hydrophones, held against the skin, recorded the sound pulses and their reflections. A consistent reflection was found about 0.8 ms after sound projection. This time corresponded to the expected two-way travel time back and forth within the spermaceti organ. Reflections were also detected at the frontal surface of the junk from sounds projected into the distal sac area. These signals must have traversed rearward along the axis of the spermaceti organ to the frontal sac where they were likely reflected and directed forward to the front of the junk, demonstrating an acoustic continuum between the spermaceti organ and the junk. These results support the basic Norris and Harvey (1972) theory of sound generation in sperm whales and later amendments to that theory (Mohl and Amundin (1991), Mohl (2001)).","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76676133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
Radiation damping, efficiency, and directivity for violin normal modes below 4 kHz 辐射阻尼，效率和指向性的小提琴正常模式低于4千赫
Acoustics research letters online : ARLO Pub Date : 2003-01-01 DOI: 10.1121/1.1524623
G. Bissinger, J. Keiffer
{"title":"Radiation damping, efficiency, and directivity for violin normal modes below 4 kHz","authors":"G. Bissinger, J. Keiffer","doi":"10.1121/1.1524623","DOIUrl":"https://doi.org/10.1121/1.1524623","url":null,"abstract":"Simultaneous modal and acoustical measurements on three violins characterized the physical chain from bridge to sound below 4 kHz via normal mode rms mobility and radiativity, total damping, radiation efficiency, and averaged directivity. The fraction of vibrational energy radiated as sound was estimated as 31%±10% for the 1st corpus bending modes. Radiation efficiencies ranged from ∼0.004 to ∼1, rising with frequency, with lower and upper 1st corpus bending mode values of 0.12±0.03 and 0.11±0.04 respectively. Averaged directivity rose slowly from ∼1 for the lowest modes to ∼2 at 4 kHz. The A1 cavity mode radiates effectively via induced corpus motion.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76985940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
Time-domain lifted wavelet collocation method for modeling nonlinear wave propagation 非线性波传播建模的时域提升小波配点法
Acoustics research letters online : ARLO Pub Date : 2002-08-29 DOI: 10.1121/1.1507121
Kelvin Lee, W. Gan
{"title":"Time-domain lifted wavelet collocation method for modeling nonlinear wave propagation","authors":"Kelvin Lee, W. Gan","doi":"10.1121/1.1507121","DOIUrl":"https://doi.org/10.1121/1.1507121","url":null,"abstract":"A time-domain adaptive numerical method for modeling nonlinear wave propagation is developed. This method is based on a second-generation wavelet collocation using a lifting scheme and makes use of the multilevel decomposition nature of the scheme to allow for automatic grid refinement according to the magnitude of waveform steepening. The multiplication in the nonlinear term is also easy due to the collocation nature. With thresholding, the solution is compact at every level of resolution and computed only at collocation points associated with the remaining significant wavelet coefficients. The error tolerance and compression ratio of the new method are totally controlled by the threshold value used. This brings substantial savings in computation time when compared to the conventional finite difference scheme on a uniformly fine grid.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76925589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of common indoor air pollutants on the speed of sound 常见室内空气污染物对声速的影响
Acoustics research letters online : ARLO Pub Date : 2002-06-25 DOI: 10.1121/1.1498176
R. Muehleisen
{"title":"Effects of common indoor air pollutants on the speed of sound","authors":"R. Muehleisen","doi":"10.1121/1.1498176","DOIUrl":"https://doi.org/10.1121/1.1498176","url":null,"abstract":"With growing concern for air quality in residential, commercial, and industrial settings, the need for inexpensive and reliable air quality sensors is growing. Since the speed of sound can be measured very precisely and reliably and the speed of sound of air is directly related to its chemical composition, measurement of the speed of sound can be used as a method to detect small changes in gas composition. The effects of small concentrations of fourteen common indoor air pollutants on the speed of sound of air are investigated. The deviations in the speed of sound from the pollutants at the maximum levels suggested by the World Health Organization (WHO), minimal risk levels developed by the Agency for Toxic Substances and Disease Registry (ATSDR), and the occupational safety levels developed by the National Institute for Occupational Safety and Health (NIOSH) are computed. The computations show that, at this time, a low cost acoustic resonant sensor is probably not sensitive enough to be used as an indoor...","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85598998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Comparison of errors in the three- and four-microphone methods used in the measurement of the acoustic properties of porous materials 用于测量多孔材料声学特性的三传声器和四传声器方法的误差比较
Acoustics research letters online : ARLO Pub Date : 2002-06-25 DOI: 10.1121/1.1498175
R. Muehleisen, C. Beamer
{"title":"Comparison of errors in the three- and four-microphone methods used in the measurement of the acoustic properties of porous materials","authors":"R. Muehleisen, C. Beamer","doi":"10.1121/1.1498175","DOIUrl":"https://doi.org/10.1121/1.1498175","url":null,"abstract":"The three-microphone and four-microphone methods have been shown useful for measuring the characteristic impedance and propagating wavenumber of porous materials. In this paper the effects of uncertainties in the apparatus and pressure transfer function measurements are analyzed using Monte Carlo methods. It is shown that for materials with low flow resistivities the four-microphone method is appreciably more accurate than the three-microphone method at low frequencies. The dominant contributors to the overall error are uncertainty in the magnitude and phase of the transfer function measurement.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85313383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Acoustic measures of vigilance 声音警戒措施
Acoustics research letters online : ARLO Pub Date : 2002-04-26 DOI: 10.1121/1.1484075
D. Daly, D. Daly
{"title":"Acoustic measures of vigilance","authors":"D. Daly, D. Daly","doi":"10.1121/1.1484075","DOIUrl":"https://doi.org/10.1121/1.1484075","url":null,"abstract":"Aberrant auditory processing can complicate using or acquiring a second language and, in some cases, even a first language. Determining the aberrations remains intractable. This study limits the scope of inquiries with evidence that the prolonged perceptual changes that accompany impaired vigilance need not alter an intact auditory system. A three-generation kinship with narcolepsy was tested using sets of synthetic ge-ye and i-I-e sounds. In all affected individuals, vigilance-dependent perceptual changes were pervasive, persistent, and preferentially affected sounds processed in cortex. With the youngest generation, these appeared before language acquisition was complete. The medicine methylphenidate restored vigilance and stable auditory perception. All individuals in generations II and III became proficient in at least two languages.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87434424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Backscattering enhancements associated with antisymmetric Lamb waves confined to the edge of a circular plate: Direct and holographic observations 与限制在圆板边缘的反对称兰姆波相关的后向散射增强:直接和全息观测
Acoustics research letters online : ARLO Pub Date : 2002-04-15 DOI: 10.1121/1.1480895
B. Hefner, P. Marston
{"title":"Backscattering enhancements associated with antisymmetric Lamb waves confined to the edge of a circular plate: Direct and holographic observations","authors":"B. Hefner, P. Marston","doi":"10.1121/1.1480895","DOIUrl":"https://doi.org/10.1121/1.1480895","url":null,"abstract":"Significant backscattering enhancements occur for thin circular plates tilted close to the coupling angle for the second antisymmetric leaky wave, the a 1 wave. Imaging the surface of the plate using acoustic holography shows that the mechanism responsible for this enhancement is associated with the excitation of a leaky wave that is confined to the edge of the plate. This “circumferential” wave couples to the incident field at the top and bottom of the plate and travels around the plate with a group velocity that is much slower than that of the a 1 wave. This circumferential wave may be a whispering gallery mode associated with the a 1 wave or a higher order flexural edge wave.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74948385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Within-subject predictors of speech recognition in cochlear implants: A null result 人工耳蜗中语音识别的受试者内预测因子:无效结果
Acoustics research letters online : ARLO Pub Date : 2002-04-02 DOI: 10.1121/1.1477875
C. Turner, M. Mehr, M. Hughes, Carolyn J. Brown, P. Abbas
{"title":"Within-subject predictors of speech recognition in cochlear implants: A null result","authors":"C. Turner, M. Mehr, M. Hughes, Carolyn J. Brown, P. Abbas","doi":"10.1121/1.1477875","DOIUrl":"https://doi.org/10.1121/1.1477875","url":null,"abstract":"This study examines the predictive relations among a variety of measures of electrode function in multichannel cochlear implant users and that stimulation site’s ability to transmit speech information. A within-subject design was used in which the relative ability of individual channels to transmit speech information was estimated by the correlational method for speech recognition. Individual electrode function measures included behavioral dynamic range, slope of the electrically evoked compound action potential (EAP) input/output function, and EAP recovery from forward masking. No consistent relations were found between any of these measures and the measures of speech transmission.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78872328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
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