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Journal of the Acoustical Society of America

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Apr 1935

Volume 6, Issue 4, pp. 199-283


The Absorption of Sound in Gases

Vern O. Knudsen

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 199-204 (1935); (6 pages) | Cited 6 times

Online Publication Date: 15 Jun 2005

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The Electrical Phenomena of the Cochlea and the Auditory Nerve

Hallowell Davis

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 205-215 (1935); (11 pages)

Online Publication Date: 15 Jun 2005

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A Loudness Scale for Industrial Noise Measurements

B. G. Churcher

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 216-225 (1935); (10 pages)

Online Publication Date: 15 Jun 2005

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Both on technical grounds and from experience in industrial noise measurements, it is recognized that the decibel scale, used as a loudness scale, does not yield numerical values proportional to the loudness sensation. In many spheres of work this occasions great inconvenience and there is need for an agreed rule for converting the decibel observations of practical noise measurements into loudness values on a linear loudness scale. A survey has therefore been made of published data with a view to deducing the most probable law for the relation between stimulus and sensation for a 1000‐cycle pure tone. Relations derived from mental estimates of loudness, from data on monaural‐binaural listening and from data on the properties of tone combinations are discussed. The evidence indicates that not only does the nerve‐impulse theory of audition provide an explanation of the faculty of making mental estimates of relative loudness and of the monaural‐binaural listening phenomena, but that stimulus‐sensation relations deduced by the two methods are in substantial quantitative agreement. On theoretical grounds it is not thought that tone combination data are admissible for this purpose and an important divergence between these and monaural‐binaural data appears to exist. Consequently the suggested relation put forward is not felt to be the most probable law. For the final relation derived in the present paper from the available data, the number 100 is assigned to the loudness evoked by an intensity of 100 db above 0.0002 dyne per sq. cm reference pressure. For practical industrial noise measurements, the relation is expressed sufficiently nearly by a simple power law between the limits of 30 and 115 db. Over this range, the loudness (L) is given by L  =  d5×10−8, where d is the number of decibels above reference pressure. In addition to its being more in conformity with introspective judgments of relative loudness, this simple rule is thought to be preferable to the suggested curve because it is easily remembered, accurately definable and easily used with the aid of a slide rule.

Subharmonics in Forced Oscillations in Dissipative Systems. Part I

P. O. Pedersen

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 227-238 (1935); (12 pages)

Online Publication Date: 15 Jun 2005

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What is Measured in Sound Absorption Measurements

Paul E. Sabine

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 239-245 (1935); (7 pages) | Cited 3 times

Online Publication Date: 15 Jun 2005

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The Motion of a Bar Vibrating in Flexures, Including the Effects of Rotary and Lateral Inertia

W. P. Mason

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 246-249 (1935); (4 pages) | Cited 1 time

Online Publication Date: 15 Jun 2005

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In this paper a complete theoretical solution is given for a bar vibrating in flexure taking account of rotary and lateral inertia. The solution shows that the frequency of a bar free to vibrate on both ends, is asymptotic to the frequency given by the usual solution, neglecting rotary inertia, when the ratio of width to length is small, and approaches the frequency of a bar in longitudinal vibration when the width becomes comparable to the length. The theoretical frequencies have been compared with the published results of Harrison on the frequency of a quartz crystal vibrating in flexure, and have been found to agree within one percent for a crystal whose width is less than half its length.

Performance of Telephone Receivers as Affected by the Ear

Harry F. Olson and Frank Massa

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 250-254 (1935); (5 pages)

Online Publication Date: 15 Jun 2005

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An analysis is made of the impedance characteristic of the ear when coupled to a telephone receiver by means of an ear cap which introduces an acoustic leak at the junction. A vibrating system is also described which causes constant sound pressure to be generated in the ear cavity under such conditions. Experimental data as obtained on an artificial ear are given showing the effect of the acoustic leak on the response of various types of receivers. Subjective tests are also described and data given which corroborate the data obtained on the artificial ear.

Quantitative Studies on the Singing Voice

S. K. Wolf, D. Stanley, and W. J. Sette

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 255-266 (1935); (12 pages)

Online Publication Date: 15 Jun 2005

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Experimental Studies on the Sound and Vibration of Drum

Jûichi Obata and Takehiko Tesima

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 267-273 (1935); (7 pages)

Online Publication Date: 15 Jun 2005

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Sound Waves of Finite Amplitude in an Exponential Horn

S. Goldstein and N. W. McLachlan

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 275-278 (1935); (4 pages) | Cited 3 times

Online Publication Date: 15 Jun 2005

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An Apparatus for Projecting Harmonic Curves in Space

Will C. Dod

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 279-281 (1935); (3 pages)

Online Publication Date: 15 Jun 2005

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Organ Pipes and Vowel Quality

Arthur Taber Jones

J. Acoust. Soc. Am. Volume 6, Issue 4, pp. 282-283 (1935); (2 pages)

Online Publication Date: 15 Jun 2005

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