Canadian Acoustics - Acoustique Canadienne最新文献

BEAM-TRACING PREDICTION OF ROOM-TO-ROOM SOUND TRANSMISSION AND THE ACCURACY OF DIFFUSE-FIELD THEORY 房间间声传输的光束跟踪预测及扩散场理论的准确性

Canadian Acoustics - Acoustique Canadienne Pub Date : 2017-08-20 DOI: 10.14288/1.0362395

Amin Mahmud, M. Hasan, M. Hodgson

{"title":"BEAM-TRACING PREDICTION OF ROOM-TO-ROOM SOUND TRANSMISSION AND THE ACCURACY OF DIFFUSE-FIELD THEORY","authors":"Amin Mahmud, M. Hasan, M. Hodgson","doi":"10.14288/1.0362395","DOIUrl":"https://doi.org/10.14288/1.0362395","url":null,"abstract":"This paper validates the applicability of the classical diffuse-field prediction formula of room-to-room sound transmission used by many practitioners using energy- and phase-based beam-tracing models. An existing beam-tracing model for empty, parallelepiped rooms with specularly-reflecting surfaces has been adapted to predict room-to-room sound transmission between the source and receiver rooms separated by a common partition. For simplicity, initially sound transmission through the homogeneous common wall is modelled as one locally-reacting homogenous partition with frequency-independent transmission loss. The energy-based beam-tracing model has been validated in both source and receiver rooms through existing results from ODEON in the literature and by comparing the prediction results with CATT-Acoustic room-to-room sound transmission model. The phase-based beam-tracing model has been validated in the source room in comparison with COMSOL predictions. The new models are then used to investigate the accuracy of the classical diffuse-field formula in both source and receiver rooms. The diffuse-field prediction formula is found quite accurate in both the rooms in the beam-tracing prediction for cubic room shape and uniform absorption of all the room surfaces (i.e. for diffuse sound fields); however, it’s accuracy decreases significantly with changes in the shape of the room and the distribution of its surface absorption (i.e. more non-diffuse sound fields).","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"45 1","pages":"66-67"},"PeriodicalIF":0.0,"publicationDate":"2017-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43120483","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

Frequency-Domain Synthetic Aperture Focusing Techniques for Imaging with Single-Element Focused Transducers 单元件聚焦传感器成像的频域合成孔径聚焦技术

Canadian Acoustics - Acoustique Canadienne Pub Date : 2017-08-19 DOI: 10.32920/ryerson.14649234

Elyas Shaswary, J. Tavakkoli, Carl Kumaradas

{"title":"Frequency-Domain Synthetic Aperture Focusing Techniques for Imaging with Single-Element Focused Transducers","authors":"Elyas Shaswary, J. Tavakkoli, Carl Kumaradas","doi":"10.32920/ryerson.14649234","DOIUrl":"https://doi.org/10.32920/ryerson.14649234","url":null,"abstract":"Synthetic aperture focusing techniques (SAFT) make the lateral spatial resolution of the conventional ultrasound imaging from a single-element focused transducer more uniform. In this work, two new frequency-domain SAFT (FD-SAFT) algorithms are proposed, which are based on 2D matched filtering techniques. The first algorithm is the FD-SAFT virtual disk source (FD-VDS) that treats the focus of a focused transducer as a finite sized virtual source and the diffraction effect in the far-field is accounted for in the image reconstruction. The second algorithm is the FD-SAFT deconvolution (FD-DC) that uses the simulated point spread function of the imaging system as a matched filter kernel in the image reconstruction. These algorithms were implemented for pulsed and linear frequency modulated chirp excitations. The performance of these algorithms was studied using a series of simulations and experiments, and it was compared with the conventional B-mode and time-domain virtual point source SAFT (TD-VPS) imaging techniques. The image quality was analyzed in terms of spatial resolution, sidelobe level, signal-to-noise ratio (SNR), contrast resolution, contrast-to- speckle ratio, and ex vivo tissue image quality. The results showed that the FD-VDS had the highest spatial resolution and FD-DC had the second highest spatial resolution. In addition, FD-DC had generally the highest SNR. The computation run time of the proposed methods was significantly lower than the TD-VPS. Furthermore, chirp excitation improves the SNR of all methods by about 8 dB without significantly affecting the spatial resolution and sidelobe level. Thus, the FD-VDS and FD-DC methods offer efficient solutions to make the spatial resolution of conventional B-mode imaging more uniform.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"45 1","pages":"94-95"},"PeriodicalIF":0.0,"publicationDate":"2017-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42685095","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

Shape Optimization of Reactive Mufflers Using Threshold Acceptance and FEM Methods 基于阈值接受和有限元方法的反应式消声器形状优化

Canadian Acoustics - Acoustique Canadienne Pub Date : 2017-06-10 DOI: 10.1121/1.4988689

Abdelkader Khamchane, Y. Khelfaoui, Brahim Hamtache

{"title":"Shape Optimization of Reactive Mufflers Using Threshold Acceptance and FEM Methods","authors":"Abdelkader Khamchane, Y. Khelfaoui, Brahim Hamtache","doi":"10.1121/1.4988689","DOIUrl":"https://doi.org/10.1121/1.4988689","url":null,"abstract":"The Shape optimization of reactive muffler under space constraint has become of great importance in the design of quieter environments. In this paper the acoustic performance of three different expansion-chamber mufflers with extended tube under space constraint is presented. A shape optimization analysis is performed using a scheme called Threshold Acceptance (TA), the best design obtained by the shape optimization method are analyzed by Finite Element Method (FEM). This numerical approach is based on the maximization of the sound transmission loss (STL) using the Transfer Matrix Method (TMM), a modelling method based on the plane wave propagation model. The FEM solution is based on the Acoustic Power method, a standard computational code COMSOL Multiphysics is used to analyze in 3D the sound attenuation of the mufflers by the FE method. The acoustical ability of the mufflers obtained is than assessed by comparing the FEM solution with the analytical method. Results show that the maximal STL is precisely located at the desired targeted tone. In addition, the acoustical performance of muffler with outlet extended tube is found to be superiors to the other one. Consequently, this approach provides a quick scheme for the shape optimization of reactive mufflers.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"45 1","pages":"25-36"},"PeriodicalIF":0.0,"publicationDate":"2017-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43872815","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

INFANTS' USE OF TEMPORAL AND PHONETIC INFORMATION IN THE ENCODING OF AUDIOVISUAL SPEECH. 婴儿在视听言语编码中对时间和语音信息的使用。

Canadian Acoustics - Acoustique Canadienne Pub Date : 2016-09-01

D Kyle Danielson, Cassie Tam, Padmapriya Kandhadai, Janet F Werker

引用次数: 0

Acoustic characteristics of obstruents in Huehuetla Tepehua Huehuetla Tepehua地区阻塞物的声学特征

Canadian Acoustics - Acoustique Canadienne Pub Date : 2016-08-25 DOI: 10.7939/R3571807W

Rebekka Puderbaugh

{"title":"Acoustic characteristics of obstruents in Huehuetla Tepehua","authors":"Rebekka Puderbaugh","doi":"10.7939/R3571807W","DOIUrl":"https://doi.org/10.7939/R3571807W","url":null,"abstract":"The Totonacan languages of Mexico are known to make extensive use of glottal stop and laryngealization, but little is known about the phonetic realizations of these contrasts. As part of a larger project investigating laryngealization in Totonacan, this paper presents a description of some acoustic properties of pulmonic and glottalic (or laryngealized) stops and affricates in Huehuetla Tepehua (HT), a Totonacan language spoken in Hidalgo, Mexico. The sound inventory of HT includes a laryngealization contrast in stops at three places of articulation: /p t k p' t' k'/, and in affricates at two places of articulation:/ts tS ts' tS'/. Closure duration and voice onset time (VOT) were measured for both stops and affricates, as well as relative burst intensity and spectral moments of bursts. Duration, relative intensity, and spectral moments of frication were also measured in affricates. Results show that closure durations are slightly shorter in laryngealized segments than in pulmonic segments across both stops and affricates in all places of articulation, although there is still substantial overlap between them. VOT and closure durations vary across places of articulation in the crosslinguistically expected way, with labial segments /p p'/ having shortest VOT and longest closure, velar segments /k k'/ having longest VOT and shortest closure, and alveolar segments /t t'/ falling in between. However, there is a great deal of overlap between durations for all stops across place, manner, and airstream/laryngealization. Affricates are longer than any other segments analyzed here, with /ts ts'/ tending to have slightly longer frication than /tS, tS'/, but slightly shorter closures. Contrary to many descriptions of glottalic (i.e. ejective) sounds, the bursts of HT laryngealized stops are far weaker than pulmonic stops, sometimes even nonexistent, making a comparison of bursts between pulmonic and laryngealized stops unlikely to be fruitful, if not impossible to complete.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71369290","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

Acoustical Investigations of Molecular Interactions in Polymer Solutions of PAN/Clay Nano composites and DMSO PAN/Clay纳米复合材料和DMSO聚合物溶液中分子相互作用的声学研究

Canadian Acoustics - Acoustique Canadienne Pub Date : 2014-01-23 DOI: 10.12691/JPBPC-2-4-3

D. Singh, A. Upmanyu

{"title":"Acoustical Investigations of Molecular Interactions in Polymer Solutions of PAN/Clay Nano composites and DMSO","authors":"D. Singh, A. Upmanyu","doi":"10.12691/JPBPC-2-4-3","DOIUrl":"https://doi.org/10.12691/JPBPC-2-4-3","url":null,"abstract":"Acoustical studies of intermolecular interactions in the polymer solution of PAN / clay nanocomposites and DMSO have been done at 30 degree Celsius using experimental ultrasonic velocity and density data taken from literature. Several acoustical and thermo-dynamical parameters such as isothermal compressibility, adiabatic compressibility, specific heat ratio, volume expansivity, surface tension, specific sound velocity, specific adiabatic compressibility, intermolecular free length, pseudo-Gruneisen parameter and classical absorption coefficient have been evaluated. Some elastic parameters such as Young modulus, shear modulus, bulk modulus and Poisson ratio have also been determined. Non linear parameters such as Moelwyn-Hughes parameter, reduced volume, reduced compressibility, Sharma’s constants, Huggins parameter, isobaric acoustical parameter, isochoric acoustical parameter, isothermal acoustical parameter, fractional free volume, repulsive exponent, thermo acoustical parameter such as A * and B * , Bayer’s non-linear parameter, internal pressure, isochoric thermo-acoustical parameter and isochoric temperature coefficient of internal pressure have also been calculated. The Moelwyn-Hughes parameter has been utilized to establish relation between the Bayer’s non linear parameter, internal pressure and Sharma constant. Relationships among the isobaric, isothermal and isochoric thermo- acoustical parameter have been studied and analyzed for PAN/clay nano composites. The obtained results have been compared with the experimental results as available in literature. The non-ideal behavior of the polymer solution has been explained in terms of its composition and variation of its acoustical and thermo-dynamical parameters. The present treatment offers a convenient method to investigate thermo-acoustic properties and anharmonic behavior of the system under study.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2014-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66658704","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

Perceptual Integration of Visual Evidence of the Airstream from Aspirated Stops. 从吸气停止的气流视觉证据的感知整合。

Canadian Acoustics - Acoustique Canadienne Pub Date : 2013-09-01

Connor Mayer, Bryan Gick, Tamra Weigel, D H Whalen

引用次数: 0

Uncertainty quantification for the trailing-edge noise of a controlled-diffusion airfoil 控制扩散翼型尾缘噪声的不确定度量化

Canadian Acoustics - Acoustique Canadienne Pub Date : 2011-06-05 DOI: 10.2514/1.J051696

J. Christophe, S. Moreau, C. Schram

引用次数: 43

Automatic volume settings for environment sensitive hearing aids 环境敏感型助听器的自动音量设置

Canadian Acoustics - Acoustique Canadienne Pub Date : 2009-09-01 DOI: 10.20381/RUOR-12558

R. Rahal, W. Gueaieb, C. Giguère, H. Othman

引用次数: 3

Expressing Tonal Closure in Music Performance: Auditory and Visual Cues 音乐表演中音调闭合的表达:听觉和视觉线索

Canadian Acoustics - Acoustique Canadienne Pub Date : 2009-03-01 DOI: 10.32920/ryerson.14639154

D. Ceaser, W. Thompson, F. Russo

{"title":"Expressing Tonal Closure in Music Performance: Auditory and Visual Cues","authors":"D. Ceaser, W. Thompson, F. Russo","doi":"10.32920/ryerson.14639154","DOIUrl":"https://doi.org/10.32920/ryerson.14639154","url":null,"abstract":"We examined whether musical performers communicate tonal closure through expressive manipulation of facial expressions and non-pitch features of the acoustic output. Two musicians hummed two versions of Silent Night: one ended on the tonic of the scale and exhibited tonal closure; the other ended on the dominant and was therefore tonally unclosed. In Experiment 1, video-only recordings of the hummed sequences were presented to 15 participants, who judged whether the (imagined) melody was closed or unclosed. Accuracy was reliably above chance, indicating that the musicians expressed tonal closure in facial expressions and listeners decoded these cues. Experiment 2 was conducted to determine whether musicians also communicate tonal closure in acoustic attributes other than pitch. All tones in the hummed melodies were pitched-shifted to a constant mean value, but performances still differed in loudness, microtonal pitch variation, timing, and timbre. Participants judged whether audio-only recordings were closed or unclosed. Accuracy was not above chance overall, but was marginally above chance for judgement of one of the two singers. Results suggest that tonal closure can be mapped onto non-pitch aspects of performance expression, but is primarily restricted to the use of facial expressions.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"37 1","pages":"29-34"},"PeriodicalIF":0.0,"publicationDate":"2009-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69468778","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