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Journal of the Acoustical Society of America

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Dec 1972

Volume 52, Issue 6A, pp. 1573-1590


Estimating the Noise Reduction of Wall Structures of Enclosures

Gus G. Tseo

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1573-1578 (1972); (6 pages)

Online Publication Date: 12 Aug 2005

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A simple method based on plane‐wave normal incidence is used to calculate the transmission coefficient, reflection coefficient, and absorption coefficient of a wall structure. The performance of the wall structure for enclosing the noise source is estimated by a term called “noise reduction,” which is the ratio of the sound intensity at the exterior side of the wall to the sound intensity at the same point with no enclosure present. Several structures with combinations of impervious layers, air space, and sound‐absorbing material are evaluated and used as examples to demonstrate the effect of mass, acoustical impedance, propagation constant, and arrangement of materials (impervious layer, absorbing material, and air) on the acoustical performance of the wall.

Polarization of Electret Microphones with Energetic Electrons

R. Brown and D. H. Rester

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1579-1586 (1972); (8 pages)

Online Publication Date: 12 Aug 2005

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The polarization of assembled electret microphones with energetic electrons from a Cockcroft‐Walton accelerator is discussed. Electron transmission curves of metallic foils and of the dielectric films Mylar and FEP Teflon are given based on experimental measurements. Results of charging experiments on Mylar and FEP are presented which show how the optimum electron bombarding energy and beam intensity were chosen for polarization of a given microphone. The method devised to monitor microphone performance in vacuum while polarization is carried out is described. The polarization of a specific microphone is discussed to illustrate the use of the electron transmission data and the method of monitoring the microphone performance.
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Beeper Ball Puts Blind Boy in the Batter's Box

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1587-1587 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Abstract Unavailable

Instruments for Noise Control and Protection of Hearing

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1588-1588 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Abstract Unavailable
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Integral Equation Methods in Sound Radiation and Scattering from Arbitrary Surfaces

G. Chertock

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1588-1588 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Abstract Unavailable

Research and Development in Hydroacoustic Impulse Sound Sources

J. K. McLaughlin, Jr.

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1588-1588 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Abstract Unavailable

A New Triangular Acoustic Pulse—Its Generation and Unique Properties for NDT Applications

N. E. Dixon and T. J. Davis

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1588-1588 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Abstract Unavailable

Characteristics of Hearing Impaired Students Under Six Years of Age, United States: 1969‐70

N. J. Murphy

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1588-1588 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Hearing Sensitivity and Related Medical Findings Among Chilren, United States

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1589-1589 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Interaction between Sound Waves Propagating in the Same Direction

O. Faltinson and S. Tjotta

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1589-1589 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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An Artificial Cochlea for the Sensory Deaf: Presurgical Development

M. Raytheon

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1589-1589 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Noise Programs of Professional/Industrial Organizations, Universities and Colleges

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1589-1589 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Sound Dispersion and Fluctuations in the Upper Ocean

J. Rautmann

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1589-1589 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Hearing Sensitivity and Related Medical Findings Among Children, United States

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1590-1590 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Noise Assessment Guidelines, Technical Background

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1590-1590 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Abstract Unavailable

Architectural Saflex for Sound Control

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1590-1590 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Abstract Unavailable

Ultrasonic “Knots” for Sutures

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1590-1590 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Abstract Unavailable

Woof Woof to You Too!

J. Acoust. Soc. Am. Volume 52, Issue 6A, pp. 1590-1590 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Abstract Unavailable
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