Proc. Meet. Acoust.最新文献

{"title":"Pre-class exposure to interactive simulations increases efficacy","authors":"T. Neilsen, Caleb B. Goates","doi":"10.1121/2.0000833","DOIUrl":"https://doi.org/10.1121/2.0000833","url":null,"abstract":"Interactive simulations are powerful learning tools. However, students often miss the point of an interactive simulation if they see it for the first time in class. A different approach is to use unscripted activities that provide individual engagement with the simulation before class. Pre-class learning activities were created for the “Descriptive Acoustics” class at Brigham young University that use interactive simulations available on the internet. Provided with basic instructions, the students explore the simulation and write a description of their experience using terminology from the corresponding textbook chapter. Exploration followed by writing, even if incorrect, has increased the level of student understanding and provides a natural way to have students participate in class as they describe their experiences. The pre-class exposure to the interactive simulations also increases the efficacy of using the simulations during class, as each student is familiar with the interface and thus can better follow the in-class demonstration. Interactive simulations are a powerful active-learning tool for the current generation of students but only if they have had personal experience with the simulation prior to seeing it in class.Interactive simulations are powerful learning tools. However, students often miss the point of an interactive simulation if they see it for the first time in class. A different approach is to use unscripted activities that provide individual engagement with the simulation before class. Pre-class learning activities were created for the “Descriptive Acoustics” class at Brigham young University that use interactive simulations available on the internet. Provided with basic instructions, the students explore the simulation and write a description of their experience using terminology from the corresponding textbook chapter. Exploration followed by writing, even if incorrect, has increased the level of student understanding and provides a natural way to have students participate in class as they describe their experiences. The pre-class exposure to the interactive simulations also increases the efficacy of using the simulations during class, as each student is familiar with the interface and thus can better f...","PeriodicalId":20469,"journal":{"name":"Proc. Meet. Acoust.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83965698","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}

{"title":"Phrase final lengthening modulates categorization of vowel length as a cue to obstruent voicing in English","authors":"Jeremy Steffman","doi":"10.1121/2.0000832","DOIUrl":"https://doi.org/10.1121/2.0000832","url":null,"abstract":"This study explores how perceptual sensitivities to contextual variability might extend to prosodically conditioned variation, a recent topic of interest in the literature. In English, vowel duration is reliably longer preceding a voiced obstruent, as opposed to a voiceless obstruent, and listeners use preceding length as a cue to obstruent voicing. Segmental duration also co-varies systematically with prosodic position, being longer phrase-finally (in phrase-final lengthening). With this in mind, The present study tested the extent to which listeners’ categorization of word-final obstruents is influenced by the prosodic position of the target sound. Participants heard a continuum that varied only in vowel length, and categorized stimuli as either “coat” or “code”. Prosodic position in a carrier phrase was manipulated by splicing the target word into either a phrase-final or phrase-medial context. Results suggest expectations about phrase-final lengthening shift categorization, with significantly longer vowel durations required in phrase-final position for a “code” response. These results are discussed in terms of their implications for further research and in relation to speech rate normalization.This study explores how perceptual sensitivities to contextual variability might extend to prosodically conditioned variation, a recent topic of interest in the literature. In English, vowel duration is reliably longer preceding a voiced obstruent, as opposed to a voiceless obstruent, and listeners use preceding length as a cue to obstruent voicing. Segmental duration also co-varies systematically with prosodic position, being longer phrase-finally (in phrase-final lengthening). With this in mind, The present study tested the extent to which listeners’ categorization of word-final obstruents is influenced by the prosodic position of the target sound. Participants heard a continuum that varied only in vowel length, and categorized stimuli as either “coat” or “code”. Prosodic position in a carrier phrase was manipulated by splicing the target word into either a phrase-final or phrase-medial context. Results suggest expectations about phrase-final lengthening shift categorization, with significantly longer v...","PeriodicalId":20469,"journal":{"name":"Proc. Meet. Acoust.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83984303","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}

{"title":"Measurement and analysis of wave propagation in water-filled steel pipeline using iterative quadratic maximum likelihood algorithm","authors":"Z. Li, Liwen Jing, Wenjie Wang, Yue Li, Amartansh Dubey, Pedro J. Lee, R. Murch","doi":"10.1121/2.0000827","DOIUrl":"https://doi.org/10.1121/2.0000827","url":null,"abstract":"Acoustic wave propagation (up to 50 kHz) within a water-filled steel pipeline is studied using laboratory experiments. The experiments were carried out in a 6 m length of cylindrical stainless steel pipeline using acoustic transducers to acquire signals from 100 locations uniformly spaced along the longitudinal axis of the pipe. By applying the iterative quadratic maximum likelihood algorithm (IQML) to the experimental results, parameters such as wave numbers, attenuations and mode amplitudes were accurately extracted for individual modes from the measurement data. We found that the IQML algorithm could extract these parameters more accurately in situations where the measurement data had low signal to noise ratio as compared to other algorithms such as Prony’s method. A very good match was obtained between the experimental results and predictions from an analytical waveguide model for the wave number dispersion curves, attenuations and acoustic power characteristics of the axisymmetric and non-axisymmetric modes. Additional physical explanations of the propagation phenomena in the pipeline waveguide were obtained using the experimental results and analytical model.Acoustic wave propagation (up to 50 kHz) within a water-filled steel pipeline is studied using laboratory experiments. The experiments were carried out in a 6 m length of cylindrical stainless steel pipeline using acoustic transducers to acquire signals from 100 locations uniformly spaced along the longitudinal axis of the pipe. By applying the iterative quadratic maximum likelihood algorithm (IQML) to the experimental results, parameters such as wave numbers, attenuations and mode amplitudes were accurately extracted for individual modes from the measurement data. We found that the IQML algorithm could extract these parameters more accurately in situations where the measurement data had low signal to noise ratio as compared to other algorithms such as Prony’s method. A very good match was obtained between the experimental results and predictions from an analytical waveguide model for the wave number dispersion curves, attenuations and acoustic power characteristics of the axisymmetric and non-axisymmetri...","PeriodicalId":20469,"journal":{"name":"Proc. Meet. Acoust.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90376351","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}

{"title":"Michael J. Owren's contributions to research on primate communication","authors":"D. Rendall","doi":"10.1121/2.0000818","DOIUrl":"https://doi.org/10.1121/2.0000818","url":null,"abstract":"Michael J. Owren made lasting contributions to the study of primate, including human, communication. Today’s session honors Michael’s contributions to the field, and it’s an honor to be invited to the session and to help pay tribute to his work. In doing so, I reflect on my own extended history with Michael, both as collaborator and friend, and on his many and varied contributions to theory, methods and empirical findings in research on human and nonhuman primates. Many of the themes Michael pursued in his work continue to be at the core of contemporary research, as reflected in the talks presented by other speakers in today’s session.Michael J. Owren made lasting contributions to the study of primate, including human, communication. Today’s session honors Michael’s contributions to the field, and it’s an honor to be invited to the session and to help pay tribute to his work. In doing so, I reflect on my own extended history with Michael, both as collaborator and friend, and on his many and varied contributions to theory, methods and empirical findings in research on human and nonhuman primates. Many of the themes Michael pursued in his work continue to be at the core of contemporary research, as reflected in the talks presented by other speakers in today’s session.","PeriodicalId":20469,"journal":{"name":"Proc. Meet. Acoust.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78353493","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}

{"title":"Incoherent sub-band averaging for improved target detection and Doppler estimation in linearly frequency modulated continuous active sonar","authors":"Jeffrey R. Bates, D. Grimmett, G. Canepa, A. Tesei","doi":"10.1121/2.0000817","DOIUrl":"https://doi.org/10.1121/2.0000817","url":null,"abstract":"Linear frequency modulated (LFM) continuous active sonar (CAS) waveforms show promise for use in target tracking given that waveforms can be split into sub-waveforms (sub-bands), thereby increasing...","PeriodicalId":20469,"journal":{"name":"Proc. Meet. Acoust.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77163538","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}

{"title":"Measurements and modeling of acoustic propagation in a seagrass meadow","authors":"M. Ballard, Kevin M. Lee, J. Sagers, G. Venegas, Andrew R. McNeese, Abdullah F. Rahman, Justin T. Dubin, P. Wilson","doi":"10.1121/2.0000812","DOIUrl":"https://doi.org/10.1121/2.0000812","url":null,"abstract":"This talk presents results from an acoustic propagation experiment conducted in the Lower Laguna Madre to characterize the acoustical properties of a seagrass meadow. At the location of the experiment, the water was one meter deep, and the seabed was covered by a dense growth of Thalassia testudinum, a type of seagrass that grows from a long, jointed rhizome buried 5 cm to 10 cm below the seafloor. The biological processes and physical characteristics associated with seagrass are known to affect acoustic propagation due to bubble production, which results in dispersion, absorption and scattering of sound. During the experiment, a Combustive Sound Source was used to produce broadband signals at ranges of 20 m to 1000 m from the receiver location. Three sensors were positioned at the receiver location: two hydrophones located within and above the seagrass canopy, and a single-axis geophone. The data were analyzed for the purposes of predicting acoustic propagation in seagrass meadows and for estimating envi...","PeriodicalId":20469,"journal":{"name":"Proc. Meet. Acoust.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80962903","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}

{"title":"Acoustic propagation at low-to-mid-frequencies in the Connecticut River","authors":"D. B. Reeder, D. Honegger, J. Joseph, C. McNeil, Tarry Rago, D. Ralston","doi":"10.1121/2.0000811","DOIUrl":"https://doi.org/10.1121/2.0000811","url":null,"abstract":"An estuary is a constrained environment which often hosts a salt wedge during flood and a fresh water plume on ebb, the structures of which are complex functions of the tide’s range and speed of advance, river discharge volumetric flow rate and river mouth morphology. A field experiment was carried out in the Connecticut River in June 2017, one goal of which was to investigate the low-to-mid-frequency acoustic propagation characteristics of the riverine salt wedge as well as the plume outside the river mouth. Linear frequency-modulated (LFM) acoustic signals in the 500-2000 Hz band were collected during several tidal cycles. Data analyses demonstrate the degree to which these features in this highly energetic environment impact acoustic propagation; dominant mechanisms are boundary interactions, salt wedge sound speed gradients and bubble clouds at the ebb plume front.An estuary is a constrained environment which often hosts a salt wedge during flood and a fresh water plume on ebb, the structures of which are complex functions of the tide’s range and speed of advance, river discharge volumetric flow rate and river mouth morphology. A field experiment was carried out in the Connecticut River in June 2017, one goal of which was to investigate the low-to-mid-frequency acoustic propagation characteristics of the riverine salt wedge as well as the plume outside the river mouth. Linear frequency-modulated (LFM) acoustic signals in the 500-2000 Hz band were collected during several tidal cycles. Data analyses demonstrate the degree to which these features in this highly energetic environment impact acoustic propagation; dominant mechanisms are boundary interactions, salt wedge sound speed gradients and bubble clouds at the ebb plume front.","PeriodicalId":20469,"journal":{"name":"Proc. Meet. Acoust.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80534642","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}

{"title":"Interactive (adjustable) plots and animations as teaching and learning tools","authors":"Daniel A. Russell","doi":"10.1121/2.0000808","DOIUrl":"https://doi.org/10.1121/2.0000808","url":null,"abstract":"Interactive plots, such as are made possible with the Manipulate[ ] command in Mathematica, can be useful as teaching tools in the classroom, as well as learning aids for students outside of class. The use of adjustable sliders to change parameter values for an equation or system of equations allows for quick visual exploration of the effects of those changes on the resulting plot. Sometimes this visualization can help students understand difficult conceptual meaning hidden in mathematical expressions. Similarly, an adjustable interactive animation can effectively facilitate an understanding of concepts that are sometimes difficult to grasp from words or equations, or even “fixed” animations. This talk will demonstrate the creation of interactive plots and animations, and showcase several examples which the author has developed and used for teaching acoustics at the graduate and undergraduate levels. In addition, we will also discuss ways that students can be encouraged to create their own interactive plo...","PeriodicalId":20469,"journal":{"name":"Proc. Meet. Acoust.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80792038","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}

{"title":"Electrophysiological audiograms in seven beluga whales (Delphinapterus leucas) from the Okhotsk Sea population","authors":"E. Sysueva, D. Nechaev, V. Popov, A. Supin","doi":"10.1121/2.0000807","DOIUrl":"https://doi.org/10.1121/2.0000807","url":null,"abstract":"Hearing thresholds were measured and audiograms were obtained in seven belugas, two males and five females, provisionally 2 to 8 years old. The measurements were performed using a transducer located 1 m in front of the head. The stimuli were tone pip trains of carrier frequencies ranging from 11.2 to 128 kHz with a pip rate of 1 kHz. Auditory evoked potentials (the rate following responses) were recorded from the head vertex. In majority of the subjects, audiograms were similar to the typical odontocete audiograms with the lowest thresholds (53.4±2.3 dB re 1 μPa) at mid-frequency range (from 32 to 76 kHz) and a threshold increase (up to 73.8±4.9 dB re 1 μPa) at high frequencies (90-128 kHz). One beluga (female, 6-7 years old) featured an asymmetric hearing loss within a frequency range from 22.5 to 54 kHz. The reason for the loss is the subject for not defined. The evoked potential audiograms should be included into base screening of odontocete subjects involved in any kind of hearing research.","PeriodicalId":20469,"journal":{"name":"Proc. Meet. Acoust.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91498253","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}

{"title":"Gliding rippled spectrum discrimination: Ripple density and gliding velocity limits","authors":"A. Supin, O. Milekhina, D. Nechaev","doi":"10.1121/2.0000801","DOIUrl":"https://doi.org/10.1121/2.0000801","url":null,"abstract":"Rippled noise is a productive model of natural signals with complex spectrum patterns. It was used as a test signal to measure spectrum-pattern resolution both in normal-hearing listeners and in hearing-impaired listeners and users of cochlear implants. However, a variety of natural auditory signals feature combined spectro-temporal patterns. These signals may be modeled by rippled noise with “gliding” ripples. In the present study, ripple gliding velocity limits as a function of ripple density were measured in normal-hearing listeners. The highest gliding velocity (expressed in oct/s or ripples/s) at which the gliding ripple pattern could be distinguished from a non-rippled noise was determined. The ripple gliding velocity limit decreased from approximately 400-500 ripple/s at a ripple density of 1 ripple/oct to approximately 50 ripple/s at a ripple density of 7 ripple/oct. The data are explained by a model based on a combine action of the excitation-pattern and temporal-processing mechanisms.","PeriodicalId":20469,"journal":{"name":"Proc. Meet. Acoust.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86415609","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}