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Journal of the Acoustical Society of America

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Jun 1965

Volume 37, Issue 6, pp. 969-1218

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Call for Help on Teaching Experiments in Acoustics

H. L. Armstrong

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1143-1143 (1965); (1 page)

Online Publication Date: 20 Jul 2005

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Abstract Unavailable

Demonstration of Masking‐Level Differences by Binaural Beats

James P. Egan

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1143-1144 (1965); (2 pages)

Online Publication Date: 20 Jul 2005

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Binaural beats that result from low‐frequency sinusoids, one to each ear, are not nearly as prominent as monaural beats. However, when in‐phase noise N0 is added to the sinusoids, the stimulus changes back and forth between N0‐S0 and N0‐Sπ, and the binaural beats are quite noticeable.

Effect of “Aural Harmonics” on Frequency Discrimination

G. Bruce Henning

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1144-1146 (1965); (3 pages)

Online Publication Date: 20 Jul 2005

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Frequency‐discrimination performance was measured in two masking conditions: one in which “aural harmonics” were audible and one in which they were not. Frequency discrimination was identical in both conditions. This result, in conjunction with additional indirect evidence, indicates that aural harmonics have no effect on frequency discrimination.

Some Comparisons between Rhyme and PB‐Word Intelligibility Tests

K. D. Kryter and Edward C. Whitman

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1146-1146 (1965); (1 page)

Online Publication Date: 20 Jul 2005

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Method for Training a Speaker to Phonate at a Given Fundamental Frequency

Martin F. Schwartz

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1147-1147 (1965); (1 page)

Online Publication Date: 20 Jul 2005

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A subject can be trained aurally to phonate at a given fundamental frequency by having him zero‐beat his fundamental frequency against a reference tone. If the reference tone is presented through a loudspeaker, a sound‐level meter can be adjusted to respond to the beats and thereby provide the speaker with a visual indication of his performance. The addition of visual information appears to facilitate the training procedure.

Erratum: Effective Elastic Coefficients for Wave Propagation in Crystals under Stress [J. Acoust. Soc. Am. 37, 348–356 (1965)]

R. N. Thurston

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1147-1147 (1965); (1 page) | Cited 1 time

Online Publication Date: 20 Jul 2005

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Temporal Coherence of Surface‐Scattered Signals

R. R. Hartley

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1147-1149 (1965); (3 pages)

Online Publication Date: 20 Jul 2005

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Data are presented on the coherency of surface scattered signals from explosive sources. Coherency figures are high and well‐grouped but the effects of surface grazing angle and frequency bands are inconclusive.

Device for Generating Surface Waves with Adjustable Speed

O. H. Wehrmann and J. L. Lundberg

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1149-1150 (1965); (2 pages)

Online Publication Date: 20 Jul 2005

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A device for generating surface waves with a low propagation velocity in the frequency range between 5 and 100 cps is described. The waves are simulated by a number of small elements vibrating with a stepwise increasing phase relationship along the direction of propagation.

Use of Directional Probes for Nearfield Measurements

Alan H. Lubfll

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1150-1152 (1965); (3 pages)

Online Publication Date: 20 Jul 2005

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The notion of using directional probes for facilitating nearfield measurements of underwater acoustic transducers is examined with the aid of the von Helmholtz form of the Huygens‐Green equation. The use of directional probes to create a uniform plane‐wave field within an enclosed volume, and, hence, replace a distant transducer for either generating a plane wave or monitoring the farfield behavior of a test transducer, seems very promising.

Comments on Normal‐Mode Theory

H. W. Marsh

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1152-1152 (1965); (1 page)

Online Publication Date: 20 Jul 2005

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Errors in a report of the author were mentioned by Pedersen and Gorden [J. Acoust. Soc. Am. 37, 105–118 (1965)] and are commented upon. Additional comments are given on the utility of normal‐mode theory applied to surface‐bounded layers.

Comments on “Acoustic‐Backing Techniques for Transducers and Radiators,” by W. J. Toulis

L. H. Royster

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1152-1153 (1965); (2 pages)

Online Publication Date: 20 Jul 2005

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Total Internal Reflection of Pulses in Stratified Media

I. Tolstoy

J. Acoust. Soc. Am. Volume 37, Issue 6, pp. 1153-1155 (1965); (3 pages)

Online Publication Date: 20 Jul 2005

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Under certain conditions discussed in this Letter, a delta‐function type of pulse, subjected to total internal reflection at a turning point in a continuously stratified medium, will suffer an obvious shape change. Essentially, the pulse acquires a tail, due to the preferred retardation of the low‐frequency components, corresponding to a frequency‐independent phase change of π/2. Two turning points of this kind produce a π phase change: the pulse shape is reconstituted by the second turning point, although the sign is changed. These effects appear to be confirmed by records of small‐charge explosions, obtained in the Mediterranean, which were made available to this writer by D. J. Parkes and R. Laval of the Saclant ASW Research Centre in La Spezia, Italy.
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