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Journal of the Acoustical Society of America

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Dec 1998

Volume 104, Issue 6, pp. 3138-3684

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Does hearing aid benefit increase over time?

Christopher W. Turner and Ruth A. Bentler

J. Acoust. Soc. Am. Volume 104, Issue 6, pp. 3673-3674 (1998); (2 pages) | Cited 1 time

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In a recent tutorial for the journal, Palmer et al. [J. Acoust. Soc. Am. 103, 1705–1721 (1998)] reviewed the literature on the potential for increases in hearing aid benefit over time (acclimatization). Their review might leave some readers with the impression that acclimatization has implications for the fitting and selection of hearing aids today. We (Turner and Bentler), along with two other researchers in the field (Humes and Cox), conducted a similar review of the literature a few years earlier [Turner et al., Ear and Hearing 17, 14S–28S (1996)] and found little evidence of a robust effect. The bulk of the existing evidence, including the most recent studies on this topic, support earlier conclusions, i.e., that there is no evidence for the existence of a strong acclimatization effect in current hearing aid use. © 1998 Acoustical Society of America.
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43.10.Ln Surveys and tutorial papers relating to acoustics research; tutorial papers on applied acoustics
43.66.Ts Auditory prostheses, hearing aids
43.66.Ba Models and theories of auditory processes
43.64.Bt Models and theories of the auditory system

Representation of the displacement in terms of scalar functions for use in transversely isotropic materials

A. Rahman and F. Ahmad

J. Acoust. Soc. Am. Volume 104, Issue 6, pp. 3675-3676 (1998); (2 pages) | Cited 4 times

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Comments are presented on two recent papers [J. Acoust. Soc. Am. 96, 2546 (1994), J. Acoust. Soc. Am. 100, 57 (1996)]. Their results can be obtained with much economy of work by employing an alternative representation for the decomposition of the displacement. This decomposition is useful whenever transversely isotropic materials are being studied. © 1998 Acoustical Society of America.
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43.20.Ks Standing waves, resonance, normal modes
43.20.Tb Interaction of vibrating structures with surrounding medium
43.40.Cw Vibrations of strings, rods, and beams

Response to “Representation of the displacement in terms of scalar functions for use in transversely isotropic materials” [J. Acoust. Soc. Am. 104, 3675 (1998)]

F. Honarvar and A. N. Sinclair

J. Acoust. Soc. Am. Volume 104, Issue 6, pp. 3677-3677 (1998); (1 page)

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The authors comment on Rahman and Ahmad’s discussion on the representation of displacement fields by scalar potential functions. © 1998 Acoustical Society of America.
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43.20.Ks Standing waves, resonance, normal modes

Observation of flexural Lamb waves (A0 mode) on water-filled cylindrical shells

J. D. N. Cheeke, X. Li, and Z. Wang

J. Acoust. Soc. Am. Volume 104, Issue 6, pp. 3678-3680 (1998); (3 pages) | Cited 3 times

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Results are presented for the propagation of circumferential acoustic waves around a thin-walled stainless steel tube. Sol gel lead titanate-zirconate (PZT) films and chirp interdigital transducer (IDT) electrodes were used to generate the A0 mode from 0.8 to 6.0 MHz. Group and phase velocity measurements are in good agreement with the theory for the empty tube. When the tube is filled with water a large decrease of 21% in group velocity is observed. While there is as yet no theoretical explanation for this effect, the results show promise for liquid sensing applications. © 1998 Acoustical Society of America.
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43.40.Dx Vibrations of membranes and plates

Atmospheric propagation transfer function determination using an adaptive filter

Jonathan W. Benson

J. Acoust. Soc. Am. Volume 104, Issue 6, pp. 3681-3684 (1998); (4 pages)

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In this Letter an alternative method for the experimental determination of the complex acoustic propagation transfer function is presented. The method uses an adaptive filter in system identification mode. The inputs to the system are the source and received signals. The transfer function is represented by finite impulse response filter coefficients. Good results were obtained using filter lengths in the range from 100 to 250 with a sampling rate of 12 k samples/s. The method is outlined and some representative results with experimental field data are given. © 1998 Acoustical Society of America.
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43.60.Lq Acoustic imaging, displays, pattern recognition, feature extraction
43.28.Fp Outdoor sound propagation through a stationary atmosphere, meteorological factors
43.28.Vd Measurement methods and instrumentation to determine or evaluate atmospheric parameters, winds, turbulence, temperatures, and pollutants in air
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