发布求助
文献互助 智能选刊 最新文献

Acoustics research letters online : ARLO最新文献

筛选
英文 中文
Monitoring formation of high intensity focused ultrasound (HIFU) induced lesions using backscattered ultrasound 利用后向散射超声监测高强度聚焦超声(HIFU)诱导病变的形成
Acoustics research letters online : ARLO Pub Date : 2004-03-16 DOI: 10.1121/1.1652131
A. Anand, P. Kaczkowski
{"title":"Monitoring formation of high intensity focused ultrasound (HIFU) induced lesions using backscattered ultrasound","authors":"A. Anand, P. Kaczkowski","doi":"10.1121/1.1652131","DOIUrl":"https://doi.org/10.1121/1.1652131","url":null,"abstract":"Backscattered radio frequency (RF) data collected in a series of in vitro experiments, in which HIFU lesions were created in bovine liver tissue, were analyzed using two signal processing approaches to visualize temporal evolution of lesion formation. Change in round-trip travel time provides information related to temperature change during and after therapy. Changes in the RF spectrum related to changes in scattering properties of the heated region were observed before visible changes appeared on B-mode images. Effect of increased attenuation in the necrosed tissue region was also observed. Results demonstrate potential for these two techniques in image-guided HIFU therapy.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"299 1","pages":"88-94"},"PeriodicalIF":0.0,"publicationDate":"2004-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77034345","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: 32
Adaptive microphone array based on pause detection 基于暂停检测的自适应麦克风阵列
Acoustics research letters online : ARLO Pub Date : 2004-03-03 DOI: 10.1121/1.1650411
Z. Šarić, S. Jovicic
{"title":"Adaptive microphone array based on pause detection","authors":"Z. Šarić, S. Jovicic","doi":"10.1121/1.1650411","DOIUrl":"https://doi.org/10.1121/1.1650411","url":null,"abstract":"In this paper the performance of generalized sidelobe canceller (GSC) in room with reverberation is analyzed. GSC is inefficient in interference suppression when there is any correlation between interference and desired signal. The reason for this is unwanted cancellation of desired signal. It was shown that cancellation of the desired signal is proportional to the correlation between the direct wave of desired signal and its reflections. There is no cancellation if the GSC weightings are estimated in pauses of desired signal. Using these facts, a new algorithm based on pause detection was proposed. Simulations prove the advantage of proposed algorithm.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"41 1","pages":"68-74"},"PeriodicalIF":0.0,"publicationDate":"2004-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87497486","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
Efficient low-order auto regressive moving average (ARMA) models for speech signals 语音信号的高效低阶自回归移动平均(ARMA)模型
Acoustics research letters online : ARLO Pub Date : 2004-03-03 DOI: 10.1121/1.1651193
L. Mitiche, B. Derras, A. Adamou-Mitiche
{"title":"Efficient low-order auto regressive moving average (ARMA) models for speech signals","authors":"L. Mitiche, B. Derras, A. Adamou-Mitiche","doi":"10.1121/1.1651193","DOIUrl":"https://doi.org/10.1121/1.1651193","url":null,"abstract":"Using model reduction, an efficient low order (ARMA) modeling process for speech is presented. In this approach, the modeling process starts with a relatively high order (AR) model obtained by some classical methods. The AR model is then reduced using the SVD-based method. The model reduction yields a reduced order ARMA model which interestingly preserves the key properties of the original full order model such as stability. Line spectral frequencies LSF and signal-to-noise ratio (SNR) behavior are also investigated. To illustrate the performance and the effectiveness of the proposed approach, some simulations are conducted on some practical speech segments, such as phonemes and sentences.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"1 1","pages":"75-81"},"PeriodicalIF":0.0,"publicationDate":"2004-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88205997","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: 4
Using hearing aid directional microphones and noise reduction algorithms to enhance cochlear implant performance 使用助听器定向麦克风和降噪算法来提高人工耳蜗的性能
Acoustics research letters online : ARLO Pub Date : 2004-03-01 DOI: 10.1121/1.1666869
King Chung, F. Zeng, S. Waltzman
{"title":"Using hearing aid directional microphones and noise reduction algorithms to enhance cochlear implant performance","authors":"King Chung, F. Zeng, S. Waltzman","doi":"10.1121/1.1666869","DOIUrl":"https://doi.org/10.1121/1.1666869","url":null,"abstract":"Hearing aids and cochlear implants are two major hearing enhancement technologies but yet share little in research and development. The purpose of this study was to determine whether hearing aid directional microphones and noise reduction technologies could enhance cochlear implant users’ speech understanding and ease of listening. Digital hearing aids serving as preprocessors were programmed to omni-directional microphone, directional microphone, and directional microphone plus noise reduction conditions. Three groups of subjects were tested with the hearing aid processed speech stimuli. Results indicated that hearing aids with directional microphones and noise reduction algorithms significantly enhanced speech understanding and listening comfort.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"30 1","pages":"56-61"},"PeriodicalIF":0.0,"publicationDate":"2004-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78075261","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: 20
An incremental excitation scale for cochlear implants 人工耳蜗植入的增量激励量表
Acoustics research letters online : ARLO Pub Date : 2004-03-01 DOI: 10.1121/1.1687471
P. Blamey, B. Dickson, Lois M. Grant
{"title":"An incremental excitation scale for cochlear implants","authors":"P. Blamey, B. Dickson, Lois M. Grant","doi":"10.1121/1.1687471","DOIUrl":"https://doi.org/10.1121/1.1687471","url":null,"abstract":"A loudness matching procedure was used to construct an excitation scale for cochlear implant patients relating neural excitation to electric charge per pulse. Statistical analysis shows the relationship to be linear for sufficiently low charge levels, with a constant slope across electrodes within individual patients. The excitation scale enables an “incremental” encoding procedure from acoustic level to electric stimulus that is independent of the pulse rate used. The statistical properties of the scale parameters can be used to simplify the fitting procedure for the implant processor. Perception of vowels and consonants using conventional and “incremental” encoding produced similar scores for four patients.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"5 1","pages":"50-55"},"PeriodicalIF":0.0,"publicationDate":"2004-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87048098","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: 3
Experimental comparison of sonoporation and electroporation in cell transfection applications 超声穿孔和电穿孔在细胞转染中的实验比较
Acoustics research letters online : ARLO Pub Date : 2004-03-01 DOI: 10.1121/1.1652111
J. Pepe, M. Rincón, Junru Wu
{"title":"Experimental comparison of sonoporation and electroporation in cell transfection applications","authors":"J. Pepe, M. Rincón, Junru Wu","doi":"10.1121/1.1652111","DOIUrl":"https://doi.org/10.1121/1.1652111","url":null,"abstract":"An experimental study has been performed for cell suspensions to compare efficiency of cell transfection. It was demonstrated that electroporation was superior to sonoporation in terms of viability (65.8±2.3% vs 50.8±4.15%) and transfection efficiency (15.83±3.5% vs 7.53±0.4%) for Jurkat lymphocytes (nonprimary cells), and sonoporation was better in terms of viability (64.8±1.51% vs 53.7±1.53%) and transfection efficiency (2.73±0.21% vs 0.43±0.06%) for human peripheral blood mononuclear cells (primary cells). The electroporation was performed using a Gene Pulser® II Apparatus with voltage of 250 V, and the sonoporation was achieved using 2-MHz pulsed ultrasound exposure (ISPPA=80 W/cm2) assisted with encapsulated bubbles (Optison®).","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"33 1","pages":"62-67"},"PeriodicalIF":0.0,"publicationDate":"2004-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78119825","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: 32
Broadband information transfer from oceanic sound transmission 海洋声传输的宽带信息传输
Acoustics research letters online : ARLO Pub Date : 2004-02-24 DOI: 10.1121/1.1688405
C. Gaumond
{"title":"Broadband information transfer from oceanic sound transmission","authors":"C. Gaumond","doi":"10.1121/1.1688405","DOIUrl":"https://doi.org/10.1121/1.1688405","url":null,"abstract":"A method is presented for determining the amount of information transferred through an oceanic channel caused by a variation of source position. The method generalizes to parameters other than source position. The amount of information transferred is shown to depend on the modulation by propagation and also the signal to noise ratio of the data. A simple numerical example is presented for a single, fixed receiver and a broadband source at a variable position in a two-mode channel.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"7 1","pages":"44-49"},"PeriodicalIF":0.0,"publicationDate":"2004-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78437114","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
STRAIGHT: A new speech synthesizer for vowel formant discrimination 一种新的语音合成器，用于元音构音辨别
Acoustics research letters online : ARLO Pub Date : 2004-02-09 DOI: 10.1121/1.1635431
Chang Liu, D. Kewley-Port
{"title":"STRAIGHT: A new speech synthesizer for vowel formant discrimination","authors":"Chang Liu, D. Kewley-Port","doi":"10.1121/1.1635431","DOIUrl":"https://doi.org/10.1121/1.1635431","url":null,"abstract":"The present study investigated whether a new tool for nearly natural speech synthesis, STRAIGHT [Kawahara et al., Speech Commun. 27, 187–207 (1999)], could be used for fine manipulation of vowel formants, using a psychophysical test of formant discrimination. Thresholds for formant discrimination of F1 and F2 for an /ɛ/ vowel, originally synthesized by the KLTSYN [Klatt, J. Acoust. Soc. Am. 67, 971–995 (1980)] and then resynthesized by STRAIGHT, were estimated. Thresholds for vowels generated by KLTSYN and by STRAIGHT were not significantly different. This result validates that STRAIGHT resynthesis can finely manipulate formant frequencies from natural speech for use in speech perception experiments.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"7 1","pages":"31-36"},"PeriodicalIF":0.0,"publicationDate":"2004-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82772295","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: 31
A masking problem in time dependent acoustic obstacle scattering 时变声障碍物散射中的掩蔽问题
Acoustics research letters online : ARLO Pub Date : 2004-02-06 DOI: 10.1121/1.1638811
L. Fatone, M. C. Recchioni, F. Zirilli
{"title":"A masking problem in time dependent acoustic obstacle scattering","authors":"L. Fatone, M. C. Recchioni, F. Zirilli","doi":"10.1121/1.1638811","DOIUrl":"https://doi.org/10.1121/1.1638811","url":null,"abstract":"A masking problem in time dependent three dimensional acoustic obstacle scattering is considered. The masking problem consists in making masked a bounded scatterer characterized by an acoustic boundary impedance and immersed in a homogeneous isotropic medium that, when hit by an incident acoustic field, generates a scattered acoustic field. The precise definition of the masking problem is given later. This problem has been formulated as an optimal control problem for the wave equation. The corresponding first order optimality condition is derived and solved with a highly parallelizable numerical method. Some numerical experience on a test problem is shown.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"1 1","pages":"25-30"},"PeriodicalIF":0.0,"publicationDate":"2004-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89057246","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
Aligning phonetic transcriptions with their citation forms 将语音转录与其引用形式对齐
Acoustics research letters online : ARLO Pub Date : 2004-02-05 DOI: 10.1121/1.1635751
Keith Johnson
{"title":"Aligning phonetic transcriptions with their citation forms","authors":"Keith Johnson","doi":"10.1121/1.1635751","DOIUrl":"https://doi.org/10.1121/1.1635751","url":null,"abstract":"One of the main motivations for publishing this paper is to make available a matrix of phone-distance measures which may be useful in dealing with large corpora of conversational speech. The paper reports how this matrix of phone-distances was created from transcriber labeling disagreements, and how it can be used in a dynamic time warping algorithm to align phonetic transcriptions of conversational speech with their citation forms. The weighted string edit distance produced by the phone-distance DTW algorithm may also be useful in calculating neighborhood densities for studies of auditory word recognition.","PeriodicalId":87384,"journal":{"name":"Acoustics research letters online : ARLO","volume":"17 1","pages":"19-24"},"PeriodicalIF":0.0,"publicationDate":"2004-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77491372","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: 4
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信