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Journal of the Acoustical Society of America

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Apr 1940

Volume 11, Issue 4, pp. 383-485


Some Practical Aspects of Architectural Acoustics

Vern O. Knudsen

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 383-389 (1940); (7 pages)

Online Publication Date: 16 Jun 2005

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Planning Functionally for Good Acoustics

J. P. Maxfield and C. C. Potwin

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 390-395 (1940); (6 pages)

Online Publication Date: 16 Jun 2005

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Sound Diffraction and Absorption by a Strip of Absorbing Material

John R. Pellam

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 396-400 (1940); (5 pages) | Cited 4 times

Online Publication Date: 16 Jun 2005

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An exact solution for the sound energy absorbed by an absorbing panel set in the surface of a large, rigid, plane wall is obtained. The ability of the strip for absorbing sound is given by a “shape factor” A, defined as the ratio of the energy retained by the panel to the energy which would be absorbed, at normal incidence, by the same section of an infinite wall, covered uniformly with the same material. Curves of A are given for three angles of incidence, and for a wide range of wave‐lengths and of normal acoustic impedance of the absorbing material. The “shape factor” reveals that a given material composing a panel absorbs most efficiently when the panel‐width approximates, or slightly exceeds, a half‐wave‐length of the incident sound. For such widths, the factor is larger than two in the case of very “soft” materials, and reduces to unity for less and less absorbent panels.

Measurement of Impact Sound Transmission Through Floors

Robert Lindahl and Hale J. Sabine

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 401-405 (1940); (5 pages) | Cited 1 time

Online Publication Date: 16 Jun 2005

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Selective Amplification in Hearing Aids

N. A. Watson and V. O. Knudsen

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 406-419 (1940); (14 pages) | Cited 2 times

Online Publication Date: 16 Jun 2005

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Studies of Acquired and Inherited Deafness in Animals

M. H. Lurie

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 420-426 (1940); (7 pages)

Online Publication Date: 16 Jun 2005

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The Locus of Distortion in the Ear

Ernest Glen Wever, Charles W. Bray, and Merle Lawrence

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 427-433 (1940); (7 pages)

Online Publication Date: 16 Jun 2005

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The Genesis of Absolute Pitch

A. Bachem

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 434-439 (1940); (6 pages) | Cited 1 time

Online Publication Date: 16 Jun 2005

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A Note on Just Intonation

Llewelyn S. Lloyd

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 440-445 (1940); (6 pages)

Online Publication Date: 16 Jun 2005

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The Paradox of Voice Teaching

Wilmer T. Bartholomew

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 446-450 (1940); (5 pages)

Online Publication Date: 16 Jun 2005

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Resonant Frequencies and Damping Constants of Resonators Involved in the Production of Sustained Vowels “O” and “Ah”

Don Lewis and Curtis Tuthill

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 451-456 (1940); (6 pages)

Online Publication Date: 16 Jun 2005

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Recent Experimental Investigations of Vocal Pitch in Speech

Grant Fairbanks

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 457-466 (1940); (10 pages) | Cited 1 time

Online Publication Date: 16 Jun 2005

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The Acoustical Impedance of an Infinite Hyperbolic Horn

J. E. Freehafer

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 467-476 (1940); (10 pages)

Online Publication Date: 16 Jun 2005

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In discussing the acoustical properties of horns, it is in general a mathematical necessity to assume plane waves. In the case of a horn in the form of an hyperboloid of one sheet, however, it is possible to avoid this assumption and to obtain an exact solution to the problem. The analysis, carried through with the aid of the differential analyzer, leads to curves representing the acoustical resistance and reactance as functions of the ratio of the radius of the throat to the wave‐length. Comparison with the conical horn shows that the hyperbolic is superior.

Graphical Determination of the Random Efficiency of Microphones

Benjamin Baumzweiger

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 477-479 (1940); (3 pages)

Online Publication Date: 16 Jun 2005

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The Attenuation of Sound in Tubes

R. Rogers

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 480-484 (1940); (5 pages) | Cited 1 time

Online Publication Date: 16 Jun 2005

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Errata: On the Theory of Fluctuations in the Decay of Sound

R. Clark Jones

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 485-485 (1940); (1 page)

Online Publication Date: 16 Jun 2005

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“Bells”

J. Acoust. Soc. Am. Volume 11, Issue 4, pp. 485-485 (1940); (1 page)

Online Publication Date: 16 Jun 2005

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