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Journal of the Acoustical Society of America

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May 2007

Volume 121, Issue 5, pp. 2457-EL222

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New Fellows of the Acoustical Society of America

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2457-2457 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.05.Ky Members and membership lists, personal notes, fellows

2007-08 F.V. Hunt Postdoctoral Research Fellowship awarded to Julie Oswald

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2457-2457 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.05.Ky Members and membership lists, personal notes, fellows

Reviewers of Manuscripts, 2006

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2457-2464 (2007); (8 pages)

Online Publication Date: 04 May 2007

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43.05.Gv Publications, ARLO, Echoes, ASA Web page, electronic archives and references

USA Meetings Calendar

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2464-2464 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.05.Hw Meetings
43.10.Ce Conferences, lectures, and announcements (not of the Acoustical Society of America)

Cumulative Indexes to the Journal of the Acoustical Society of America

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2464-2464 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.05.Gv Publications, ARLO, Echoes, ASA Web page, electronic archives and references
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Acoustical Standards News

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2467-2469 (2007); (3 pages)

Online Publication Date: 04 May 2007

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43.15.+s Standards
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Grating Lobe Reduction in Transducer Arrays Through Structural Filtering of Supercritical Plates (A)

Brian E. Anderson

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2471-2471 (2007); (1 page)

Online Publication Date: 04 May 2007

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The effect of placing a structural acoustic filter between water and the transducer elements of an array is investigated to help reduce undesirable grating lobes. A plate is mounted to transducer elements with a thin decoupling polyurethane layer between the transducer and the plate. The plate acts as a radiation/incidence angle filter to pass energy at angles near normal incidence, but suppress energy at large incidence angles. Grating lobe reduction is achieved at the expense of limiting the available steering of the main lobe. Within this steer angle limitation, the main lobe can be steered as normal while the grating lobe level is reduced by the plate’s angular filtering. The insertion of a plate structural filter provides an inexpensive and easily implemented approach to extend usable frequency bandwidth with reduced level grating lobes, without increasing the number of array elements. Even though some data matches theory well, a practical material has yet to be found that possesses optimal material properties. To the author’s knowledge, this work represents the first attempt to advantageously utilize a plate to provide angular dependent sound transmission filtering above the plate’s critical frequency (the supercritical frequency region). [Work sponsored by ONR Code 333, Dr. David Drumheller.]
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43.38.Hz Transducer arrays, acoustic interaction effects in arrays
43.30.Yj Transducers and transducer arrays for underwater sound; transducer calibration
43.55.Rg Sound transmission through walls and through ducts: theory and measurement

Pulsed Mid-Infrared Laser Stimulation of the Auditory Nerve in the Gerbil: Implications for Cochlear Implants (A)

Agnella D. Izzo

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2471-2471 (2007); (1 page)

Online Publication Date: 04 May 2007

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Light can artificially stimulate nerve activity in vivo and has the advantage of a higher spatial selectivity relative to that which can be obtained with electrical stimulation. An increased spatial selectivity of stimulation could improve the function of neuroprosthetics, such as cochlear implants, whose performance is limited by overlapping electric fields from neighboring electrodes. The studies reported here investigated optical stimulation of nerves in the gerbil auditory system. Pulsed, infrared light was used to elicit compound action potentials (CAPs) from the gerbil cochlea in vivo. Penetration depth was varied by changing the wavelength of irradiation, to select the tissue depth of stimulation. Experiments showed no immediate damage to the cochlea when optically stimulating at 400 Hz for several hours. Immunohistochemical staining for the protein c-FOS revealed spatial specificity of the optically stimulated cochleae: only the spiral ganglion cells directly in the optical path revealed c-FOS staining, indicating that they were stimulated. In contrast, c-FOS staining of electrically stimulated cochleae demonstrated electric current spread. An electrophysiologic measurement of the spatial specificity of optical stimulation was conducted with tone-on-light masking experiments. Results from tone-on-light masking studies revealed tuning curves that were similar in extent to tone-on-tone tuning curves.
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43.66.Ts Auditory prostheses, hearing aids
42.62.Be Biological and medical applications
87.19.L- Neuroscience

Microstructure and Acoustical Macro-Behavior: Approach by Reconstruction of a Representative Elementary Cell (A)

Camille Perrot

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2471-2471 (2007); (1 page)

Online Publication Date: 04 May 2007

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The fundamental issue of determining acoustic properties of porous media from their local geometry is examined in this Ph.D. dissertation thesis, thanks to a sample of open-cell aluminium foam analyzed by axial computed microtomography. Various geometric properties are measured to characterize the experimental sample at the cell size level. This is done in order to reconstruct a porous medium by means of idealized three- and two-dimensional unit cells. The frequency dependent thermal and velocity fields governing the propagation and dissipation of acoustic waves through rigid porous media are computed by Brownian motion simulation and the finite element method, respectively. Macroscopic behavior is derived by spatial averaging of the local fields. Our results are compared to experimental data obtained from impedance tube measurements. First, this approach leads to the identification of the macroscopic parameters involved in Pride and Lafarge semiphenomenological models. Second, it yields a direct access to thermal and viscous dynamic permeabilities. However, the bidimensional model underestimates the static viscous permeability as well as the viscous characteristic length; what thus require a three-dimensional implementation.
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43.55.Hy Subjective effects in room acoustics, speech in rooms
43.55.Ev Sound absorption properties of materials: theory and measurement of sound absorption coefficients; acoustic impedance and admittance
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Multiple Scattering, Interaction of Time-Harmonic Waves with N Obstacles

P. A. Martin and Jean-Marc Conoir, Reviewer

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2473-2473 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.10.Hj Books and book reviews
43.20.Bi Mathematical theory of wave propagation

How Equal Temperature Ruined Harmony (and Why You Should Care)

Ross W. Duffin, Author and Donald E. Hall, Reviewer

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2473-2474 (2007); (2 pages)

Online Publication Date: 04 May 2007

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43.10.Hj Books and book reviews
43.60.Hj Time-frequency signal processing, wavelets
43.75.Bc Scales, intonation, vibrato, composition
43.66.Jh Timbre, timbre in musical acoustics
43.75.Wx Electronic and computer music

Analysis, Synthesis, and Perception of Musical Sounds

James W. Beauchamp, Editor and Donald E. Hall, Reviewer

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2473-2474 (2007); (2 pages)

Online Publication Date: 04 May 2007

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43.10.Hj Books and book reviews
43.60.Hj Time-frequency signal processing, wavelets
43.75.Bc Scales, intonation, vibrato, composition
43.66.Jh Timbre, timbre in musical acoustics
43.75.Wx Electronic and computer music
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Methods and devices for determining the resonance frequency of passive mechanical resonators (P)

Doron Girmonsky

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2475-2475 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.35.Zc Use of ultrasonics in nondestructive testing, industrial processes, and industrial products

Indium or tin bonded acoustic transducer systems (P)

Mark J. Beck and Richard B. Vennerbeck

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2475-2476 (2007); (2 pages)

Online Publication Date: 04 May 2007

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43.35.Zc Use of ultrasonics in nondestructive testing, industrial processes, and industrial products

Acoustic wave sensor with reduced condensation and recovery time (P)

James Z. Liu

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2476-2476 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.38.Ar Transducing principles, materials, and structures: general

Vehicle accessory microphone assembly having a windscreen with hydrophobic properties (P)

Alan R. Watson

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2476-2476 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.38.Ar Transducing principles, materials, and structures: general

Electret assembly for a microphone having a backplate with improved charge stability (P)

Aart Z. van Halteren

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2476-2476 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.38.Ar Transducing principles, materials, and structures: general

Acoustical switch for a directional microphone (P)

John P. McSwiggen

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2476-2476 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.38.Ar Transducing principles, materials, and structures: general

Electret condenser microphone (P)

James S. Collins

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2476-2477 (2007); (2 pages)

Online Publication Date: 04 May 2007

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43.38.Ar Transducing principles, materials, and structures: general

Microphone assembly (P)

Megumi Horiuchi and Tsutomu Ojima

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2477-2477 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.38.Ar Transducing principles, materials, and structures: general

MEMS teeter‐totter accelerometer having reduced nonlinearty (P)

Ronald B. Leonardson and David L. Malametz

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2477-2477 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.38.Bs Electrostatic transducers

Acoustic device (P)

David Johnson and William John Metheringham

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2477-2477 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.38.Ct Magnetostrictive transducers

Speaker unit (P)

Tomohiro Kawata and Kunio Mitobe

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2477-2477 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.38.Dv Electromagnetic and electrodynamic transducers

Transparent panel‐form loudspeaker (P)

Tai‐Yan Kam

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2478-2478 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.38.Dv Electromagnetic and electrodynamic transducers

Electroacoustic transducer with a diaphragm, and method for fixing a diaphragm in such transducer (P)

Wilmink Engbert

J. Acoust. Soc. Am. Volume 121, Issue 5, pp. 2478-2478 (2007); (1 page)

Online Publication Date: 04 May 2007

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43.38.Dv Electromagnetic and electrodynamic transducers
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