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Backward compatible wideband voice over narrowband low-resolution media 窄带低分辨率媒体上的向后兼容宽带语音
Acoustics research letters online : ARLO Pub Date : 2005-01-01 DOI: 10.1121/1.1815244
H. Ding
{"title":"Backward compatible wideband voice over narrowband low-resolution media","authors":"H. Ding","doi":"10.1121/1.1815244","DOIUrl":"https://doi.org/10.1121/1.1815244","url":null,"abstract":"This paper proposes a scheme for transmitting or storing a wideband version of voice (up to 7 kHz) in a narrowband channel or medium (up to 3.4 kHz) with a low resolution data format. The scheme is fully backward compatible; a conventional receiver, without any decoding mechanism, can still access a narrowband version of the wideband voice. The proposed scheme can be applied where a high quality wideband voice is needed but the physical capacity is limited. Examples are voice-over-IP, digital private branch exchange, as well as storage and playback. An audio demonstration is given in the paper.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"1 1","pages":"41-47"},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83037836","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: 1
Temporally stabilized sonoluminescence in ethylene glycol 乙二醇中暂时稳定的声致发光
Acoustics research letters online : ARLO Pub Date : 2005-01-01 DOI: 10.1121/1.1827811
F. B. Seeley, D. Gregory, S. Thompson, Jeremiah D. Brown
{"title":"Temporally stabilized sonoluminescence in ethylene glycol","authors":"F. B. Seeley, D. Gregory, S. Thompson, Jeremiah D. Brown","doi":"10.1121/1.1827811","DOIUrl":"https://doi.org/10.1121/1.1827811","url":null,"abstract":"The emission of light flashes from sound driven bubbles in ethylene glycol at 20–23 °C has been temporally stabilized. The intensity of the light flashes is approximately twice that of SBSL in degassed water at 20 °C. The time jitter is less than 100 ns and the flashes spatially jitter less than 2 mm around stable positions near the pressure antinode of the second harmonic. The light flashes trace out periodic, continuous orbits within this small region. Sonoluminescence in ethylene glycol is relatively stable with temporally stabilized SBSL bubbles lasting up to 60 min.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"37 1","pages":"48-52"},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90370944","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
Three-dimensional ultrasound imaging 三维超声成像
Acoustics research letters online : ARLO Pub Date : 2005-01-01 DOI: 10.1121/1.1815074
Changhe Huang, G. Auner, H. John Caulfield, John D. G. Rather
{"title":"Three-dimensional ultrasound imaging","authors":"Changhe Huang, G. Auner, H. John Caulfield, John D. G. Rather","doi":"10.1121/1.1815074","DOIUrl":"https://doi.org/10.1121/1.1815074","url":null,"abstract":"In medical and other important applications, it is desirable to achieve transmissive ultrasonic 3D imaging in “real time.” Until now, transmissive ultrasonic images have been possible, but either in real time 2D or relatively slow 3D. By using an ultrasonic stereo camera and a real time viewing system, live and interactive 3D transmissive ultrasonic images have been produced. Fast transmissive ultrasound tomography has been achieved by using a single ultrasonic camera. Some advantages and applications are discussed.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"60 1","pages":"53-57"},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87607421","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: 5
Observations of acoustic scattering from turbulent microstructure in Knight Inlet 奈特入口湍流微结构声散射观测
Acoustics research letters online : ARLO Pub Date : 2005-01-01 DOI: 10.1121/1.1809151
M. Trevorrow
{"title":"Observations of acoustic scattering from turbulent microstructure in Knight Inlet","authors":"M. Trevorrow","doi":"10.1121/1.1809151","DOIUrl":"https://doi.org/10.1121/1.1809151","url":null,"abstract":"Calibrated echo-sounder surveys were conducted on the backscatter from turbulent microstructure within internal lee-waves at a sill in Knight Inlet, B.C. Volumetric scatter strengths in the range −90 to −75 dB (re 1 m−1) were observed within narrow (1 to 10 m thick) layers at three frequencies (38, 120, and 200 kHz). The observed acoustic scattering levels were in reasonable agreement with published models for microstructure scattering. A new volumetric multi-beam sonar was used to image the spatial structure of the turbulent billows.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"112 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80828956","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
Speech perception with a cochlear implant sound processor incorporating loudness models 结合响度模型的人工耳蜗声音处理器的语音感知
Acoustics research letters online : ARLO Pub Date : 2005-01-01 DOI: 10.1121/1.1809152
Hugh J. McDermott, C. Sucher, C. McKay
{"title":"Speech perception with a cochlear implant sound processor incorporating loudness models","authors":"Hugh J. McDermott, C. Sucher, C. McKay","doi":"10.1121/1.1809152","DOIUrl":"https://doi.org/10.1121/1.1809152","url":null,"abstract":"Recently, a new paradigm for processing sounds for cochlear implants has been described that aims to normalize loudness for complex signals, relative to normal acoustic loudness perception [McDermott et al., J. Acoust. Soc. Am. 114, 2190–2197 (2003)]. A first implementation of a sound processor based on this paradigm, called SpeL, has been evaluated with speech perception tests conducted in quiet and in noise. For the five participating subjects, the average scores from these tests for SpeL were very close to those for the conventional ACE scheme. However, audibility was improved by about 5 dB for SpeL compared with ACE.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"32 1","pages":"7-13"},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91179174","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
In vitro microscopic imaging of enhanced thrombolysis with 120-kHz ultrasound in a human clot model. 120 khz超声增强人血块模型溶栓的体外显微成像。
Acoustics research letters online : ARLO Pub Date : 2005-01-01 DOI: 10.1121/1.1815039
Jason Y Cheng, George J Shaw, Christy K Holland
{"title":"In vitro microscopic imaging of enhanced thrombolysis with 120-kHz ultrasound in a human clot model.","authors":"Jason Y Cheng, George J Shaw, Christy K Holland","doi":"10.1121/1.1815039","DOIUrl":"10.1121/1.1815039","url":null,"abstract":"<p><p>Substantial enhancement of recombinant tissue plasminogen activator (rt-PA) thrombolysis can be achieved with ultrasound, suggesting its use as an adjunctive treatment in thrombolytic therapy for stroke. A microscopic visualization method was used to measure the lysis of human whole-blood clots treated with human fresh frozen plasma (HFFP), rt-PA, and 120-kHz ultrasound for 30 min at T = 37 ° C. The clot-plasma interface was imaged using an inverted optical microscope and the thrombolytic front analyzed as a function of time. Ultrasound treatment significantly enhanced the mean lytic rate from 0.5 to 3.4 μm/min (a 580% change) compared with rt-PA treatment alone.</p>","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"6 1","pages":"25-29"},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2137158/pdf/nihms23649.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27118162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparison of group delays of 2f(1)-f(2) distortion product otoacoustic emissions and cochlear travel times. 2f(1)-f(2)畸变产物耳声发射和耳蜗移动时间的组延迟比较。
Acoustics research letters online : ARLO Pub Date : 2004-10-01 DOI: 10.1121/1.1771711
Mario A Ruggero
{"title":"Comparison of group delays of 2f(1)-f(2) distortion product otoacoustic emissions and cochlear travel times.","authors":"Mario A Ruggero","doi":"10.1121/1.1771711","DOIUrl":"10.1121/1.1771711","url":null,"abstract":"<p><p>To help elucidate how distortion-product otoacoustic emissions propagate from their cochlear sites of origin to the middle ear, their group delays were compared with basilar-membrane and organ of Corti travel times measured in guinea pig, gerbil, and chinchilla.</p>","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"5 4","pages":"143-147"},"PeriodicalIF":0.0,"publicationDate":"2004-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2196440/pdf/nihms20960.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41064335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Imaging the destruction of individual ultrasound contrast microbubbles with diagnostic ultrasound 诊断超声对单个超声造影剂微泡破坏的成像
Acoustics research letters online : ARLO Pub Date : 2004-09-15 DOI: 10.1121/1.1795311
J. Guan, T. Matula, M. Averkiou
{"title":"Imaging the destruction of individual ultrasound contrast microbubbles with diagnostic ultrasound","authors":"J. Guan, T. Matula, M. Averkiou","doi":"10.1121/1.1795311","DOIUrl":"https://doi.org/10.1121/1.1795311","url":null,"abstract":"Ultrasound imaging of ultrasound contrast agent fragmentation in a water bath was performed with the color Doppler mode of the HDI 5000 (Phillips Ultrasound). A highly diluted suspension of ultrasound contrast microbubbles (Optison®) was injected into the water bath such that individual microbubbles passed through the image plane every few seconds. Decorrelation of the signal, along with the appearance of multiple signals, suggests that single microbubble fragmentation was observed, with daughter bubbles being formed from the original microbubbles, depending on the applied acoustic pressure.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"47 1","pages":"165-169"},"PeriodicalIF":0.0,"publicationDate":"2004-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76922246","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
International Round Robin on Room Acoustical Impulse Response Analysis Software 2004 室内声脉冲响应分析软件2004国际循环赛
Acoustics research letters online : ARLO Pub Date : 2004-08-23 DOI: 10.1121/1.1758239
B. Katz
{"title":"International Round Robin on Room Acoustical Impulse Response Analysis Software 2004","authors":"B. Katz","doi":"10.1121/1.1758239","DOIUrl":"https://doi.org/10.1121/1.1758239","url":null,"abstract":"The intent of this study is to examine the variations between current implementations of standard room acoustic measures for impulse response measurements. An international round robin has been conducted using a single real measured impulse response, rather than a synthesized response. This offers a more rigorous test of analysis procedures. While there is good agreement at higher frequencies, large variations are found at lower frequencies in which the noise level within the measurement is greater. Some errors are attributed to the existence or robustness of noise-floor detection.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"57 1","pages":"158-164"},"PeriodicalIF":0.0,"publicationDate":"2004-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87071339","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: 42
Limitations of theoretical benefit from an adaptive directional system in reverberant environments 混响环境下自适应定向系统理论效益的局限性
Acoustics research letters online : ARLO Pub Date : 2004-08-13 DOI: 10.1121/1.1788071
W. S. Woods, T. Trine
{"title":"Limitations of theoretical benefit from an adaptive directional system in reverberant environments","authors":"W. S. Woods, T. Trine","doi":"10.1121/1.1788071","DOIUrl":"https://doi.org/10.1121/1.1788071","url":null,"abstract":"Hearing aids with adaptive and fixed two-microphone processing are currently available. Although the noise reduction increase of adaptive over fixed aids can theoretically be tens of dB, it is unclear if this benefit can be found with realistic processing and conditions. Thus, a theoretical analysis of the ability of today’s aids to attenuate jammers in “everyday” conditions [direct-reverberant ratio ⩽5.0 dB] is provided. Processing limitations restrict aids to wideband null steering through intermicrophone delay variation. Delay variation is predicted to provide maximally 2.0 dB more noise reduction than the best fixed system on average, and only at the highest direct-reverberant ratios.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"260 1","pages":"153-157"},"PeriodicalIF":0.0,"publicationDate":"2004-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83117542","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
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