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Journal of the Acoustical Society of America

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https://www.readbyqxmd.com/read/28863623/space-time-domain-solutions-of-the-wave-equation-by-a-non-singular-boundary-integral-method-and-fourier-transform
#1
Evert Klaseboer, Shahrokh Sepehrirahnama, Derek Y C Chan
The general space-time evolution of the scattering of an incident acoustic plane wave pulse by an arbitrary configuration of targets is treated by employing a recently developed non-singular boundary integral method to solve the Helmholtz equation in the frequency domain from which the space-time solution of the wave equation is obtained using the fast Fourier transform. The non-singular boundary integral solution can enforce the radiation boundary condition at infinity exactly and can account for multiple scattering effects at all spacings between scatterers without adverse effects on the numerical precision...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863622/masking-release-effects-of-a-standard-and-a-regional-linguistic-variety
#2
Susanne Brouwer
Previous research has shown that the more similar the target and the masker signal, the harder it is to segregate the two streams effectively [i.e., target-masker linguistic similarity hypothesis, e.g., Brouwer, Van Engen, Calandruccio, and Bradlow (2012). J. Acoust. Soc. Am. 131(2), 1449-1464]. The present study examined whether this hypothesis holds when a standard variety of a language (Dutch) is paired with one of its regional varieties (Limburgian). Dutch and Limburgian listeners were tested on a speech-in-speech recognition task to investigate whether familiarity with the target and/or maskers influenced their performance...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863621/rigid-and-elastic-acoustic-scattering-signal-separation-for-underwater-target
#3
Hongjian Jia, Xiukun Li, Xiangxia Meng
Underwater target elastic acoustic scattering and other acoustic scattering components are aliasing together in the time and frequency domains, and the existing signal processing methods cannot recognize the elastic scattering features under the aliasing condition because of the resolution limitation. To address this problem, this study, which is based on the target echo highlight model, analyzes the characteristics of target acoustic scattering components when the transmitted signal is a linear frequency modulation pulse...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863620/a-one-school-year-longitudinal-study-of-secondary-school-teachers-voice-parameters-and-the-influence-of-classroom-acoustics
#4
Giulia Calosso, Giuseppina Emma Puglisi, Arianna Astolfi, Antonella Castellana, Alessio Carullo, Franco Pellerey
Recent literature reports that a large percentage of teachers complain that teaching has an adverse effect on their voice status. Thus, more needs to be done to study their vocal behavior. The objective of this longitudinal study was twofold: to determine changes in the voice use of teachers over a school year, and to study the relationships between voice use and classroom acoustic parameters. Thirty-one teachers from two secondary schools in Turin (Italy) were involved at the beginning of the 2014-2015 school year, and 22 of them also participated at the end of the same school year...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863619/vowel-recognition-at-fundamental-frequencies-up-to-1%C3%A2-khz-reveals-point-vowels-as-acoustic-landmarks
#5
Daniel Friedrichs, Dieter Maurer, Stuart Rosen, Volker Dellwo
The phonological function of vowels can be maintained at fundamental frequencies (fo) up to 880 Hz [Friedrichs, Maurer, and Dellwo (2015). J. Acoust. Soc. Am. 138, EL36-EL42]. Here, the influence of talker variability and multiple response options on vowel recognition at high fos is assessed. The stimuli (n = 264) consisted of eight isolated vowels (/i y e ø ε a o u/) produced by three female native German talkers at 11 fos within a range of 220-1046 Hz. In a closed-set identification task, 21 listeners were presented excised 700-ms vowel nuclei with quasi-flat fo contours and resonance trajectories...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863618/an-assessment-of-a-spatial-ear-training-program-for-perceived-auditory-source-width
#6
Sungyoung Kim, Hidetaka Imamura
The authors propose a training program for a listener to quantify the horizontal extension of an auditory image-auditory source width (ASW). The proposed program controls the ASW of a five-channel sound source by spreading it across five front loudspeakers, displays the corresponding change in visual width, and trains listeners to remember the spread angle through an isomorphic mapping to the corresponding visual cue. To evaluate the efficacy of the training, the authors conducted pre- and post-training tests...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863617/time-of-flight-dependency-on-transducer-separation-distance-in-a-reflective-path-guided-wave-ultrasonic-flow-meter-at-zero-flow-conditions
#7
Magne Aanes, Remi Andre Kippersund, Kjetil Daae Lohne, Kjell-Eivind Frøysa, Per Lunde
Transit-time flow meters based on guided ultrasonic wave propagation in the pipe spool have several advantages compared to traditional inline ultrasonic flow metering. The extended interrogation field, obtained by continuous leakage from guided waves traveling in the pipe wall, increases robustness toward entrained particles or gas in the flow. In reflective-path guided-wave ultrasonic flow meters (GW-UFMs), the flow equations are derived from signals propagating solely in the pipe wall and from signals passing twice through the fluid...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863616/the-role-of-short-time-intensity-and-envelope-power-for-speech-intelligibility-and-psychoacoustic-masking
#8
Thomas Biberger, Stephan D Ewert
The generalized power spectrum model [GPSM; Biberger and Ewert (2016). J. Acoust. Soc. Am. 140, 1023-1038], combining the "classical" concept of the power-spectrum model (PSM) and the envelope power spectrum-model (EPSM), was demonstrated to account for several psychoacoustic and speech intelligibility (SI) experiments. The PSM path of the model uses long-time power signal-to-noise ratios (SNRs), while the EPSM path uses short-time envelope power SNRs. A systematic comparison of existing SI models for several spectro-temporal manipulations of speech maskers and gender combinations of target and masker speakers [Schubotz et al...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863615/speech-produced-in-noise-relationship-between-listening-difficulty-and-acoustic-and-durational-parameters
#9
Simone Graetzer, Pasquale Bottalico, Eric J Hunter
Conversational speech produced in noise can be characterised by increases in intelligibility relative to such speech produced in quiet. Listening difficulty (LD) is a metric that can be used to evaluate speech transmission performance more sensitively than intelligibility scores in situations in which performance is likely to be high. The objectives of the present study were to evaluate the LD of speech produced in different noise and style conditions, to evaluate the spectral and durational speech modifications associated with these conditions, and to determine whether any of the spectral and durational parameters predicted LD...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863614/towards-a-joint-reflection-distortion-otoacoustic-emission-profile-results-in-normal-and-impaired-ears
#10
Carolina Abdala, Radha Kalluri
Otoacoustic emissions (OAEs) provide salient information about cochlear function and dysfunction. Two broad classes of emissions, linear reflection and nonlinear distortion, arise via distinct cochlear processes and hence, appear to provide independent information about cochlear health and hearing. Considered in combination, these two OAE types may characterize sensory hearing loss most effectively. In this study, the level-dependent growth of stimulus-frequency OAEs (a reflection-type emission) and distortion-product OAEs (a distortion-type emission) were measured in ten normal-hearing ears and eight ears with slight-to-moderate sensorineural hearing loss...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863613/reciprocity-relationships-in-vector-acoustics-and-their-application-to-vector-field-calculations
#11
Thomas J Deal, Kevin B Smith
The reciprocity equation commonly stated in underwater acoustics relates pressure fields and monopole sources. It is often used to predict the pressure measured by a hydrophone for multiple source locations by placing a source at the hydrophone location and calculating the field everywhere for that source. A similar equation that governs the orthogonal components of the particle velocity field is needed to enable this computational method to be used for acoustic vector sensors. This paper derives a general reciprocity equation that accounts for both monopole and dipole sources...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863612/further-understanding-of-doorway-states-in-elastic-systems
#12
J A Otero, G Monsivais, A Morales, L Gutiérrez, A Díaz-de-Anda, J Flores
In a previous work an elastic bar with a groove or notch that presents a doorway state was studied when the system was excited with 20 cycles of harmonic signals. The strength function had a Lorentzian width Γd = 1/πτd, where τd is the decay time of the prompt response. In the present paper, the doorway-state phenomenon is analyzed again for the same harmonic signals but for a very large number of cycles. The strength-function phenomenon is once more obtained, but now with a Lorentzian width Γ(') which is larger than Γd...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863611/phonetic-enhancement-of-mandarin-vowels-and-tones-infant-directed-speech-and-lombard-speech
#13
Ping Tang, Nan Xu Rattanasone, Ivan Yuen, Katherine Demuth
Speech units are reported to be hyperarticulated in both infant-directed speech (IDS) and Lombard speech. Since these two registers have typically been studied separately, it is unclear if the same speech units are hyperarticulated in the same manner between these registers. The aim of the present study is to compare the effect of register on vowel and tone modification in the tonal language Mandarin Chinese. Vowel and tone productions were produced by 15 Mandarin-speaking mothers during interactions with their 12-month-old infants during a play session (IDS), in conversation with a Mandarin-speaking adult in a 70 dBA eight-talker babble noise environment (Lombard speech), and in a quiet environment (adult-directed speech)...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863610/acoustic-and-perceptual-effects-of-amplitude-and-frequency-compression-on-high-frequency-speech
#14
Joshua M Alexander, Varsha Rallapalli
This study investigated how six different amplification methods influence acoustic properties, and subsequently perception, of high-frequency cues in fricatives that have been processed with conventional full bandwidth amplification or nonlinear frequency compression (NFC)-12 conditions total. Amplification methods included linear gain, fast/slow-acting wide dynamic range compression crossed with fixed/individualized compression parameters, and a method with adaptive time constants. Twenty-one hearing-impaired listeners identified seven fricatives in nonsense syllables produced by female talkers...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863609/wave-field-synthesis-of-moving-sources-with-arbitrary-trajectory-and-velocity-profile
#15
Gergely Firtha, Péter Fiala
The sound field synthesis of moving sound sources is of great importance when dynamic virtual sound scenes are to be reconstructed. Previous solutions considered only virtual sources moving uniformly along a straight trajectory, synthesized employing a linear loudspeaker array. This article presents the synthesis of point sources following an arbitrary trajectory. Under high-frequency assumptions 2.5D Wave Field Synthesis driving functions are derived for arbitrary shaped secondary source contours by adapting the stationary phase approximation to the dynamic description of sources in motion...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863608/using-multipath-reflections-to-obtain-dive-depths-of-beaked-whales-from-a-towed-hydrophone-array
#16
Annamaria Izzi DeAngelis, Robert Valtierra, Sofie M Van Parijs, Danielle Cholewiak
Beaked whales are deep divers, emitting echolocation clicks while at depth. Little is known about the dive behavior of most species; however, passive acoustic data collected with towed hydrophone arrays can provide depth information using multipath reflections of clicks coupled with a two-dimensional localization of the individual. Data were collected during a shipboard survey in the western North Atlantic Ocean using a towed linear hydrophone array. Beaked whale tracks were classified as either Cuvier's (Ziphius cavirostris) or Gervais'/True's (Mesoplodon europaeus/Mesoplodon mirus)...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863607/effect-of-level-difference-between-left-and-right-vocal-folds-on-phonation-physical-experiment-and-theoretical-study
#17
Isao T Tokuda, Ryo Shimamura
As an alternative factor to produce asymmetry between left and right vocal folds, the present study focuses on level difference, which is defined as the distance between the upper surfaces of the bilateral vocal folds in the inferior-superior direction. Physical models of the vocal folds were utilized to study the effect of the level difference on the phonation threshold pressure. A vocal tract model was also attached to the vocal fold model. For two types of different models, experiments revealed that the phonation threshold pressure tended to increase as the level difference was extended...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863606/erratum-the-effect-of-cubic-material-nonlinearity-on-the-propagation-of-torsional-wave-modes-in-a-pipe-j-acoust-soc-am-140-3874-3883-2016
#18
Yanzheng Wang, Jan D Achenbach
No abstract text is available yet for this article.
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863605/just-noticeable-differences-for-pitch-direction-height-and-slope-for-mandarin-and-english-listeners
#19
Allard Jongman, Zhen Qin, Jie Zhang, Joan A Sereno
Previous studies on tones suggest that Mandarin listeners are more sensitive to pitch direction and slope while English listeners primarily attend to pitch height. In this study, just noticeable differences were established for pitch discrimination using a three-interval, forced-choice procedure with a two-down, one-up staircase design. A high rising and a high falling Mandarin tone were manipulated in terms of pitch direction, height, and slope. Results indicate that, overall, Mandarin listeners are more sensitive to pitch slope and English listeners to pitch height...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863604/fitting-pole-zero-micromechanical-models-to-cochlear-response-measurements
#20
Stephen J Elliott, Guangjian Ni, Luyang Sun
An efficient way of describing the linear micromechanical response of the cochlea is in terms of its poles and zeros. Pole-zero models with local scaling symmetry are derived for both one and two degree-of-freedom micromechanical systems. These elements are then used in a model of the coupled cochlea, which is optimised to minimise the mean square difference between its frequency response and that measured on the basilar membrane inside the mouse cochlea by Lee, Raphael, Xia, Kim, Grillet, Applegate, Ellerbee Bowden, and Oghalai [(2016) J...
August 2017: Journal of the Acoustical Society of America
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