1. |
Deviations in the Loudness Judgments of 100 People |
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The Journal of the Acoustical Society of America,
Volume 8,
Issue 2,
1936,
Page 71-80
J. C. Steinberg,
W. A. Munson,
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摘要:
Distributions of loudness judgments are shown for a large group of observers comparing 100‐ and 5000‐cycle tones with a 1000‐cycle reference tone. The tests were made with automatic equipment for conducting the constant stimuli type of test. Additional tests show how experience, hearing acuity, time variations, and other factors affect deviations of loudness judgments.
ISSN:0001-4966
DOI:10.1121/1.1915879
出版商:Acoustical Society of America
年代:1936
数据来源: AIP
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2. |
NBC Studio Design |
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The Journal of the Acoustical Society of America,
Volume 8,
Issue 2,
1936,
Page 81-90
Robert M. Morris,
George M. Nixon,
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ISSN:0001-4966
DOI:10.1121/1.1915880
出版商:Acoustical Society of America
年代:1936
数据来源: AIP
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3. |
Vocal Resonance |
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The Journal of the Acoustical Society of America,
Volume 8,
Issue 2,
1936,
Page 91-99
Don Lewis,
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ISSN:0001-4966
DOI:10.1121/1.1915881
出版商:Acoustical Society of America
年代:1936
数据来源: AIP
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4. |
Automotive Quieting |
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The Journal of the Acoustical Society of America,
Volume 8,
Issue 2,
1936,
Page 100-103
R. F. Norris,
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摘要:
Intake roar, exhaust noise and body resonance are discussed; methods by which these noises are attacked are explained and data showing their relative importance are given.
ISSN:0001-4966
DOI:10.1121/1.1915882
出版商:Acoustical Society of America
年代:1936
数据来源: AIP
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5. |
A Method of Eliminating Cavity Resonance, Extending Low Frequency Response and Increasing Acoustic Damping in Cabinet Type Loudspeakers |
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The Journal of the Acoustical Society of America,
Volume 8,
Issue 2,
1936,
Page 104-111
Benjamin Olney,
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摘要:
When a direct‐radiator loudspeaker is mounted in a cabinet, as in the conventional radio receiver, response irregularities are introduced because of resonances in the space behind the loudspeaker. With a cabinet and a speaker diaphragm of ordinary size, the acoustic load at low frequencies is highly reactive, the radiation efficiency is very low and diaphragm amplitudes become excessive. In the method described, the rear of the loudspeaker diaphragm is tightly coupled to one end of a folded conduit lined with sound‐absorbing material and terminating in an opening in the bottom of the cabinet. This arrangement is called an acoustical labyrinth. By suitably proportioning the conduit, an extension downward of the reproduced frequency range is secured. The acoustic impedance of the conduit is shown by measurement to offer a diaphragm load having desirable characteristics, it being predominantly resistive over nearly the entire measured low frequency range (40–350 cycles). Measurements of the important acoustic and electrical impedances of a conventional and a labyrinth loudspeaker system also are reported. The improvement in the frequency characteristic of a cabinet type loudspeaker afforded by the use of the acoustical labyrinth is shown by response curves.
ISSN:0001-4966
DOI:10.1121/1.1915883
出版商:Acoustical Society of America
年代:1936
数据来源: AIP
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6. |
The Present Status of the Mechanics of Sound Conduction in Its Relation to the Possible Correction of Conduction Deafness |
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The Journal of the Acoustical Society of America,
Volume 8,
Issue 2,
1936,
Page 112-117
A. G. Pohlman,
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ISSN:0001-4966
DOI:10.1121/1.1915884
出版商:Acoustical Society of America
年代:1936
数据来源: AIP
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7. |
Some Data on a Room Designed for Free Field Measurements |
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The Journal of the Acoustical Society of America,
Volume 8,
Issue 2,
1936,
Page 118-125
E. H. Bedell,
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摘要:
This paper gives some data on the absorbing material used in a room recently completed and intended for acoustical measurements under essentially free field conditions. The absorbing material, which consists of a number of layers of cloth separated by air spaces, is shown to have an absorption coefficient of the order of 98 to 99 percent over a wide frequency range. Some data are also given showing the degree of departures of the sound field in the room from the field to be expected in free space. It is shown that it may not be possible to duplicate a free field in an enclosed room, regardless of the freedom from interference obtained, because of the fact that the pressure may decrease more rapidly than the inverse distance law applying to a free field.
ISSN:0001-4966
DOI:10.1121/1.1915885
出版商:Acoustical Society of America
年代:1936
数据来源: AIP
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8. |
Loudspeakers for High‐Fidelity Large Scale Reproduction of Sound |
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The Journal of the Acoustical Society of America,
Volume 8,
Issue 2,
1936,
Page 126-132
Frank Massa,
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摘要:
The extension of both frequency and volume range in large scale sound reproduction has imposed severe limitations on the performance characteristics of loudspeakers employed in these applications. This paper discusses some of the problems that arise under such conditions and what means have been taken for their solution. The limitations of single speakers to cover the entire frequency range are mentioned and the advantages of multispeaker systems are pointed out.
ISSN:0001-4966
DOI:10.1121/1.1915886
出版商:Acoustical Society of America
年代:1936
数据来源: AIP
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9. |
The Role of Acoustical Measurements in Machinery Quieting |
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The Journal of the Acoustical Society of America,
Volume 8,
Issue 2,
1936,
Page 133-142
Ernest J. Abbott,
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PDF (1200KB)
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ISSN:0001-4966
DOI:10.1121/1.1915887
出版商:Acoustical Society of America
年代:1936
数据来源: AIP
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