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Journal of the Acoustical Society of America

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May 2008

Volume 123, Issue 5, pp. 2443-EL120

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Contribution of onset/offset information of modulation to amplitude modulation depth discrimination

Derek R. Edwards, Jungmee Lee, Jennifer Andrews, and Aileen Wong

J. Acoust. Soc. Am. Volume 123, Issue 5, pp. EL111-EL115 (2008); (5 pages)

Online Publication Date: 08 Apr 2008

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A previous study by [ J. Lee, G. Long, and C. Jeung, J. Acoust. Soc. Am. 119, S3332 (2006) ] found that information at the onset or offset of modulation could be utilized for improved amplitude modulation (AM) depth discrimination in a continuous carrier condition (carrier presented 250 ms earlier and later than the modulator). In this study, the relative contribution of information at the onset or offset of the modulation was examined with an onset-fringe carrier condition (carrier begins 250 ms earlier than the modulator) and an offset-fringe condition (carrier ends 250 ms later than the modulator). The results suggest that modulation information at the onset might be utilized more than at the offset.
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43.66.Mk Temporal and sequential aspects of hearing; auditory grouping in relation to music
43.66.Fe Discrimination: intensity and frequency
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Flexural wave dispersion in orthotropic plates with heavy fluid loading

Elizabeth Magliula and J. Gregory McDaniel

J. Acoust. Soc. Am. Volume 123, Issue 5, pp. EL116-EL120 (2008); (5 pages)

Online Publication Date: 08 Apr 2008

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Orthotropic plates support flexural waves with wavenumbers that depend on their angle of propagation. The present work investigates the effect of fluid loading on this angular dependence, and finds that the effect is relatively small for typical composite plate materials in contact with water. This finding results from an analytical model of the fluid-loaded plate, in which the plate is modeled by classical laminated plate theory and the fluid is modeled as an ideal acoustic fluid. The resulting dispersion relation is a tenth-order polynomial in the flexural wavenumber. Direct numerical solution, as well as analysis at frequencies below coincidence, reveals that the angular dependence of wavenumber is magnified but not significantly distorted by the addition of fluid loading.
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43.40.Dx Vibrations of membranes and plates
43.20.Hq Velocity and attenuation of acoustic waves
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