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Low-frequency sound generation from breaking surf 海浪破碎时产生的低频声音
Acoustics research letters online : ARLO Pub Date : 2004-02-04 DOI: 10.1121/1.1636502
S. L. Means
{"title":"Low-frequency sound generation from breaking surf","authors":"S. L. Means","doi":"10.1121/1.1636502","DOIUrl":"https://doi.org/10.1121/1.1636502","url":null,"abstract":"An existing collective oscillation model for low-frequency sound generation from an open-ocean wave is extended to the surf zone. The hemispherical geometry of the open-ocean breaking wave entrained bubble cloud is replaced by a prolate hemispheroidal cloud. A Green’s function is obtained for a point source within this cloud. The far-field acoustic intensity is then computed for a distribution of point sources within a cloud. It is hypothesized that cloud resonances, assuming a “long” orientation is applicable, are determined by the minor-axis length for cloud sizes observed in the surf zone at frequencies of interest here.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"49 1","pages":"13-18"},"PeriodicalIF":0.0,"publicationDate":"2004-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77185034","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: 7
Concentration determination of a binary mixture of air and carbon disulfide gas using optoacoustics 光声法测定空气和二硫化碳气体二元混合物的浓度
Acoustics research letters online : ARLO Pub Date : 2004-01-16 DOI: 10.1121/1.1637051
Stanley A. Cheyne, W. C. McDermott, Matthew D. Rannals, Joshua E. Vaughan
{"title":"Concentration determination of a binary mixture of air and carbon disulfide gas using optoacoustics","authors":"Stanley A. Cheyne, W. C. McDermott, Matthew D. Rannals, Joshua E. Vaughan","doi":"10.1121/1.1637051","DOIUrl":"https://doi.org/10.1121/1.1637051","url":null,"abstract":"The optoacoustic effect has been used to study the concentration of gaseous carbon disulfide in a binary mixture with air. A 1.25-MW nitrogen laser having a wavelength of 337 nm and pulse duration of 800 ps was used as the optoacoustic source. Microphones and a laser Doppler vibrometer were used to detect the optoacoustic signal. Several test cells were used to investigate optoacoustic signals in order to detect the presence and concentration of a gas in binary mixture with air in open and closed cell environments.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"36 1","pages":"7-12"},"PeriodicalIF":0.0,"publicationDate":"2004-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73407607","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
Physiological correlates of the perceptual pitch shift for sounds with similar waveform autocorrelation 具有相似波形自相关的声音的知觉音高移位的生理关联
Acoustics research letters online : ARLO Pub Date : 2004-01-01 DOI: 10.1121/1.1633778
D. Pressnitzer, A. Cheveigné, I. Winter
{"title":"Physiological correlates of the perceptual pitch shift for sounds with similar waveform autocorrelation","authors":"D. Pressnitzer, A. Cheveigné, I. Winter","doi":"10.1121/1.1633778","DOIUrl":"https://doi.org/10.1121/1.1633778","url":null,"abstract":"A perceptual experiment shows that random click trains with a uniform interclick distribution can be reliably pitch-matched to pseudo-periodic click trains. The pitch matches cannot be explained on the basis of mean rate, power spectrum, or autocorrelation of the waveform. The matches are qualitatively, but not quantitatively, consistent with the most common interspike interval present in responses of single units from the ventral cochlear nucleus of anaesthetised guinea pigs. The physiological recordings also demonstrate that at the level of the cochlear nucleus, similar cues are found in either first-order or all-order interspike interval statistics.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"28 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77183726","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: 16
A statistical analysis of acoustic emission signals for tool condition monitoring (TCM) 刀具状态监测声发射信号的统计分析
Acoustics research letters online : ARLO Pub Date : 2003-12-27 DOI: 10.1121/1.1532370
G. Pontuale, F. Farrelly, A. Petri, L. Pitolli
{"title":"A statistical analysis of acoustic emission signals for tool condition monitoring (TCM)","authors":"G. Pontuale, F. Farrelly, A. Petri, L. Pitolli","doi":"10.1121/1.1532370","DOIUrl":"https://doi.org/10.1121/1.1532370","url":null,"abstract":"The statistical properties of acoustic emission signals for tool condition monitoring (TCM) applications in mechanical lathe machining are analyzed in this paper. Time series data and root mean square (RMS) values at various tool wear levels are shown to exhibit features that can be put into relation with aging in both cases. In particular, the histograms of raw data show power-law distributions above a cross-over value, in which newer cutting tools exhibit more numerous larger events compared with more worn-out ones. For practical purposes, statistics based on RMS values are more feasible, and the analysis of these also reveals discriminating age-related features. The assumption that experimental RMS histograms follow a Beta (β) distribution has also been tested. The residuals of the modeling β functions indicate that the search for a more appropriate fitting function for the experimental distribution is desirable.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"8 1","pages":"13-18"},"PeriodicalIF":0.0,"publicationDate":"2003-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73087529","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: 24
Investigating the role of infant-directed speech with a computer model 用计算机模型研究婴儿指示语的作用
Acoustics research letters online : ARLO Pub Date : 2003-08-14 DOI: 10.1121/1.1613311
B. D. Boer, P. Kuhl
{"title":"Investigating the role of infant-directed speech with a computer model","authors":"B. D. Boer, P. Kuhl","doi":"10.1121/1.1613311","DOIUrl":"https://doi.org/10.1121/1.1613311","url":null,"abstract":"A computer model (expectation maximization of a mixture of Gaussians) is used to learn the positions of vowel categories from two sets of recorded words. The number of vowels is known beforehand. The results show that vowel positions learned on the basis of infant-directed (ID) speech correspond better to those in the input than those learned on the basis of adult-directed (AD) speech.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"36 1","pages":"129-134"},"PeriodicalIF":0.0,"publicationDate":"2003-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76185957","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: 153
Effects of high presentation levels on recognition of low- and high-frequency speech 高表达水平对低频和高频语音识别的影响
Acoustics research letters online : ARLO Pub Date : 2003-07-21 DOI: 10.1121/1.1605151
Michelle R. Molis, V. Summers
{"title":"Effects of high presentation levels on recognition of low- and high-frequency speech","authors":"Michelle R. Molis, V. Summers","doi":"10.1121/1.1605151","DOIUrl":"https://doi.org/10.1121/1.1605151","url":null,"abstract":"Speech recognition accuracy decreases when presentation levels are raised above moderate levels. This “rollover” effect at high levels has generally been viewed as a broadband phenomenon, influencing low- and high-frequency processing similarly. In the current study, listeners with normal hearing identified lowpass and highpass sentences at a range of presentation levels to determine whether rollover effects might be greater in either region. Recognition scores showed larger and more consistent decreases at high levels (i.e., greater rollover) for high-frequency speech materials. The results are consistent with both physiological and psychoacoustic data suggesting that cochlear processing shows greater level dependence in basal regions tuned to high frequencies than apical, low-frequency regions. Predictions of speech intelligibility by methods such as the Speech Intelligibility Index [ANSI, 1997] may be improved if the frequency-dependence of rollover is considered.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"48 1","pages":"124-128"},"PeriodicalIF":0.0,"publicationDate":"2003-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80162296","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: 28
Ringed seal densities and noise near an icebound artificial island with construction and drilling 在冰封人工岛附近施工和钻探的环状海豹密度和噪音
Acoustics research letters online : ARLO Pub Date : 2003-07-21 DOI: 10.1121/1.1605091
V. Moulton, W. Richardson, Michael T. Williams, S. B. Blackwell
{"title":"Ringed seal densities and noise near an icebound artificial island with construction and drilling","authors":"V. Moulton, W. Richardson, Michael T. Williams, S. B. Blackwell","doi":"10.1121/1.1605091","DOIUrl":"https://doi.org/10.1121/1.1605091","url":null,"abstract":"A monitoring program documented densities of ringed seals, Phoca hispida, before and during development of the Northstar oil field in the central Alaskan Beaufort Sea. Aerial surveys of seals on landfast ice were conducted during the springs of 1997 to 1999 (pre-construction) and 2000–2001 (construction and drilling). Acoustic and vibration data were acquired during the ice-covered seasons of 2000 and 2001. Underwater sounds, in-air sounds, and iceborne vibrations from Northstar were above background levels to distances of 1–5, 0.5–4, and 1–4 km, respectively. However, seal densities close to Northstar in 2000 and 2001 were not reduced relative to those farther away or during the 1997 to 1999 period.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"18 1","pages":"112-117"},"PeriodicalIF":0.0,"publicationDate":"2003-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86447472","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
Visualization of edge diffraction 边缘衍射的可视化
Acoustics research letters online : ARLO Pub Date : 2003-07-21 DOI: 10.1121/1.1605131
V. Pulkki, T. Lokki
{"title":"Visualization of edge diffraction","authors":"V. Pulkki, T. Lokki","doi":"10.1121/1.1605131","DOIUrl":"https://doi.org/10.1121/1.1605131","url":null,"abstract":"The acoustics of a room can be visualized by plotting image sources at the positions where they occur. Recently, the image-source method has been extended to include edge diffraction. A visualization technique for image source method including diffraction is presented. As examples, first-order diffraction in a stage-house, and second-order diffraction around a loudspeaker enclosure are visualized.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"11 1","pages":"118-123"},"PeriodicalIF":0.0,"publicationDate":"2003-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77804483","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
Focused arrivals in shallow water propagation in the Straits of Florida 佛罗里达海峡浅水区集中到达
Acoustics research letters online : ARLO Pub Date : 2003-06-05 DOI: 10.1121/1.1591713
H. Deferrari, N. Williams, Hien B. Nguyen
{"title":"Focused arrivals in shallow water propagation in the Straits of Florida","authors":"H. Deferrari, N. Williams, Hien B. Nguyen","doi":"10.1121/1.1591713","DOIUrl":"https://doi.org/10.1121/1.1591713","url":null,"abstract":"Observations of multipath on the western shelf area of the Florida Straits have consistently revealed an intense arrival associated with refracted bottom reflected (RBR) rays/modes. The ‘late’ or ‘focused’ arrival is 15 to 20 dB higher than other arrivals. Parabolic Equation and Normal Mode propagation models and the shallow water invariant, beta, are used to explain the focusing. The sound speed profile that produces the focusing comes about from a combination of a strong downward refracting layer resulting from the geostrophic equilibrium of the Florida current on top of a well mixed turbulent bottom boundary layer. The resulting c(z) resembles cosh(g(1−z/D)), which produce perfect focusing at every range, that is, all RBR modes have the exact same group velocity.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"101 1","pages":"106-111"},"PeriodicalIF":0.0,"publicationDate":"2003-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90309623","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: 12
EMA compatibility of the Clarion 1.2 cochlear implant system Clarion 1.2人工耳蜗系统的EMA兼容性
Acoustics research letters online : ARLO Pub Date : 2003-06-04 DOI: 10.1121/1.1591712
W. Katz, Sneha V. Bharadwaj, Gretchen J. Gabbert, P. Loizou, E. Tobey, Oguz Poroy
{"title":"EMA compatibility of the Clarion 1.2 cochlear implant system","authors":"W. Katz, Sneha V. Bharadwaj, Gretchen J. Gabbert, P. Loizou, E. Tobey, Oguz Poroy","doi":"10.1121/1.1591712","DOIUrl":"https://doi.org/10.1121/1.1591712","url":null,"abstract":"Three experiments examined whether the Clarion 1.2 S-Series cochlear implant could be safely and effectively used within a Carstens Medizinelektronik EMA (electromagnetic articulography) system. Experiment 1 indicated no measurable effects of EMA magnetic fields on implant function. Experiment 2 showed no influence of the implant on the accuracy of EMA measurements. Experiment 3 found no indication of reduced sentence repetition abilities when EMA fields were present. The results suggest experiments with the Clarion 1.2 cochlear implant and the Carstens AG100 articulograph are safe and feasible.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"52 1","pages":"100-105"},"PeriodicalIF":0.0,"publicationDate":"2003-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85801464","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
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