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Journal of the Acoustical Society of America

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Oct 1970

Volume 48, Issue 4A, pp. 843-861


Quantification of the Noisiness of “Approaching” and “Receding” Sounds

George Rosinger, Charles W. Nixon, and Henning E. Von Gierke

J. Acoust. Soc. Am. Volume 48, Issue 4A, pp. 843-853 (1970); (11 pages)

Online Publication Date: 03 Aug 2005

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This investigation represents the first phase of a research program designed to quantify subjective responses to time‐varying sounds grossly approximating those produced by aircraft flying over an observer at rest. The basic sounds employed represented “approaching” and “receding” sources that continuously increased or decreased in intensity and/or frequency over a period of 15.25 sec. The comparative annoyance or noisiness of such sounds was evaluated by means of paired comparison and individual adjustment judgments. For the three experiments conducted, the findings indicated that: (1) Signals representing an “approaching” sound were generally judged more annoying than those representing a “receding” sound—in spite of the fact that the approaching and receding signals contained the same average intensity and frequency content over signal duration. (2) Signals with time‐varying components—whether intensity or frequency—were judged to be noisier than signals with non‐time‐varying components. The maximum average difference due to time variation of the signal was 17.5 dB. (3) Time‐varying intensity components appeared to have a greater influence on judgments of noisiness than did time‐varying frequency components. (4) On the average, only small nonsystematic differences in noisiness were found as a function of the three frequency conditions investigated (125‐, 1000‐, and 4000‐Hz‐band center frequency).
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Experiments with the Raes Method for Producing Diffuse Sounds

Alberto Behar and Jorge Menyhart

J. Acoust. Soc. Am. Volume 48, Issue 4A, pp. 854-855 (1970); (2 pages)

Online Publication Date: 03 Aug 2005

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In a recent paper [J. Acoust. Soc. Amer. 46, 831–834 (1969)], A. C. Raes suggests the producing of diffuse sound fields through the use of two speakers excited alternately. The present paper describes some experiments devoted to research work on the grade of sound diffusion obtained by using this method. To this end, work was carried out in six chambers having different acoustic characteristics. In each case, the chamber was excited by white‐noise signals produced by two speakers, first simultaneously and then alternately, in accordance with the suggested method. The sound level was measured at different points in each chamber, and the standard deviation was calculated. The results seem to show that the suggested method does not better diffusion substantially.
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ACOUSTIC SENSOR CONFIGURATION FOR MINIMUM FLOW NOISE GENERATION

Hanno H. Heller

J. Acoust. Soc. Am. Volume 48, Issue 4A, pp. 856-856 (1970); (1 page)

Online Publication Date: 03 Aug 2005

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Abstract Unavailable

TRANSDUCER FOR MEASURING MANDIBULAR MOVEMENTS

Harvey M. Sussman and Karl U. Smith

J. Acoust. Soc. Am. Volume 48, Issue 4A, pp. 857-858 (1970); (2 pages)

Online Publication Date: 03 Aug 2005

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A new transducing device that can record the dynamic movements of the mandible during speech is described. The transduction principle is based on the variable resistance changes of strain gauge elements bonded to a flexible metal beam attached to the mandible. The voltage output of the transducer is directly proportional to the lowering and elevation movements of the mandible and can be recorded on a standard oscillograph. The transducer itself is incorporated within a headgear apparatus so that the transducer moves with the head movements of the speaker and thus minimizes artifacts from this source. Calibration procedures and sample records are provided. The transducer is economically constructed and permits on‐line flexibility for signal presentation.

TRANSDUCER FOR MEASURING LIP MOVEMENTS DURING SPEECH

Harvey M. Sussman and Karl U. Smith

J. Acoust. Soc. Am. Volume 48, Issue 4A, pp. 858-860 (1970); (3 pages) | Cited 1 time

Online Publication Date: 03 Aug 2005

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Abstract Unavailable

SONGS OF THE HUMPBACK WHALE

J. Acoust. Soc. Am. Volume 48, Issue 4A, pp. 860-860 (1970); (1 page)

Online Publication Date: 03 Aug 2005

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HAZARDOUS NOISE LEVELS IN COMPUTER LABS

J. Acoust. Soc. Am. Volume 48, Issue 4A, pp. 860-861 (1970); (2 pages)

Online Publication Date: 03 Aug 2005

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Abstract Unavailable

FOLLOW THAT FISH!

J. Acoust. Soc. Am. Volume 48, Issue 4A, pp. 861-861 (1970); (1 page)

Online Publication Date: 03 Aug 2005

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THE GOPHER CHASER

J. Acoust. Soc. Am. Volume 48, Issue 4A, pp. 861-861 (1970); (1 page)

Online Publication Date: 03 Aug 2005

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