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Journal of the Acoustical Society of America

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Apr 1982

Volume 71, Issue S1, pp. S1-S113

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back to top Session S. Architectural Acoustics III: General Session I
Contributed Paper
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Subjective rating of sound insulation: A pilot study (A)

J. S. Bradley

J. Acoust. Soc. Am. Volume 71, Issue S1, pp. S39-S39 (1982); (1 page)

Online Publication Date: 12 Aug 2005

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A pilot field study of the subjective rating of the sound insulation of party walls was carried out on 98 subjects. Twenty‐four hour background noise measurements were made in each home and the sound transmission loss of the party walls were measured in 1/3‐octave bands. Significant relationships were obtained between annoyance responses and both STC and A‐weighted transmission loss values. Measured noise levels in the neighbor's home also related significantly to measured annoyance, but no reduction of annoyance was observed due to noise levels in the subject's own home. The various annoyance responses were less homogeneous, more personal, and more unique than those commonly found in traffic noise studies.
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Acoustical design of the dance hall of the Castle Restaurant (A)

K. A. Owusu‐Ansah

J. Acoust. Soc. Am. Volume 71, Issue S1, pp. S39-S39 (1982); (1 page)

Online Publication Date: 12 Aug 2005

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Castle Restaurant is situated in a quiet residential area of Kano City in Nigeria. A street separates it from the City Library now under construction. The management of the Restaurant has proposed to build a hall within the building which would be used for dancing, music, and a conference hall. This paper describes (a) the acoustic design of the hall which will meet the requirements of the multipurpose hall and (b) the steps taken to reduce the noise that would emanate from the hall so that neither the residents nor the users of the library would be disturbed.
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Computer evaluation of reverberant Sound Pressure Level in interconnected spaces (A)

Joseph C. Testen

J. Acoust. Soc. Am. Volume 71, Issue S1, pp. S39-S39 (1982); (1 page)

Online Publication Date: 12 Aug 2005

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One of the requirements of builders of U.S. Navy ships is that Sound Pressure Levels (SPL's) within compartments do not exceed specified octave‐band levels. In order to anticipate future problems, a computer program (NOISE) was written in FORTRAN to compute the SPL's within as many as 30 interconnected compartments and to compare predicted values to specified values. The acoustic energy input can be either equipment Sound Power Levels (PWL's) within compartments or predetermined adjacent compartment SPL's. The program is used in conjunction with a data set containing information on Transmission Losses, Absorption Coefficients, and Airborne Noise Specified Values. A user‐created file inputs data on compartment connectivity and geometry. The output contains tabular listings of SPL in each octave band with deficiencies noted for each compartment.
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An acoustical round robin with a difference (A)

R. E. Halliwell

J. Acoust. Soc. Am. Volume 71, Issue S1, pp. S39-S39 (1982); (1 page)

Online Publication Date: 12 Aug 2005

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Traditionally, an acoustical absorption round robin requires that a number of laboratories perform similar measurements on the same or nominally the same material and report the results to a coordinating body. Recently the Division of Building Research of the National Research Council Canada completed a different type of round robin, with absorption measurments being made on the same sample, using the same equipment, and performed by the same operators at a number of acoustical laboratories in Canada and the United States. This makes it possible to reduce the variability associated with different measurement procedures so that the variability due to room and diffuser geometry can be studied.
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A different look at the anechoic wedge (A)

Glenn E. Warnaka

J. Acoust. Soc. Am. Volume 71, Issue S1, pp. S39-S39 (1982); (1 page)

Online Publication Date: 12 Aug 2005

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Anechoic wedges are conventionally installed with the tapered point of the wedge pointing toward the test space and with the flat base of the wedge either against a rigid wall or separated from the wall by an air gap. A comparative investigation has been carried out in which the wedges were first conventionally oriented and then turned 180° so that the points of the wedges faced the wall. These comparative tests were performed in reverberation rooms both here and in Europe and also in two different impedance tubes. The results are extremely interesting. They tend to indicate that a “reversed” anechoic wedge can give a lower cutoff frequency than when conventionally oriented. Some possible explanations are offered for the measured performance.
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Multiple sources in statistical room acoustics (A)

Douglas H. Keefe

J. Acoust. Soc. Am. Volume 71, Issue S1, pp. S39-S40 (1982); (2 pages)

Online Publication Date: 12 Aug 2005

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The problem of the radiation due to pure tone excitation from two simple sources in a reverberant room is considered. The sources are separated by a fixed distance d. The room‐averaged power and the spatial cross correlation have been computed for frequencies above the Schroeder frequency of the room using a modal expansion. The sources are located at (r0 + ½d) and (r0 − ½d). The room average is taken over all source locations by averaging over all r0 and over all angular orientations of d. It is assumed that d is much smaller than a typical room dimension L, so that terms of order (d/L) are neglected. The interference terms due to the presence of room boundaries measured at the observation point r are similar to those computed in the single source case, and become negligible sufficiently far from the room boundaries. If the magnitudes of the source strengths are Q1 and Q2 and if ϕ is the phase difference between the two source excitations, then the room‐averaged power in the reverberant field far from the boundaries is proportional to Power ∼  Q12 + Q22 + 2Q1Q2 cos ϕ (sin kd/kd), where k is the wavenumber. The cross term is similar to the free‐space mutual impedance term and vanishes when the spacing d is large compared to a wavelength. The spatial cross‐correlation function R at two points in the reverberant field separated by a distance r has also been calculated. This function is R = (sin kr/kr), the same as for a single source, as long as R is averaged over all angular orientations of d. These results demonstrate that the sound power radiated from multiple sources or an extended structure is not simply additive. On the other hand, the statistical character of the sound field produced by multiple sources is very similar to the single source case.
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The development of fm broadcast studios as performance spaces (A)

Daniel Queen

J. Acoust. Soc. Am. Volume 71, Issue S1, pp. S40-S40 (1982); (1 page)

Online Publication Date: 12 Aug 2005

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The design of the recently completed studio complex for fine‐arts station WFMT utilized measurement and analysis of desirable existing spaces to determine desired characteristics, such as early‐late sound ratios, optimization of room dimensions for uniform mode spacing, and manipulation of reflections to improve diffusion. The main studio is designed to produce microphone pickup as in the chosen existing spaces, while maintaining a comfortable environment for performers ranging from chamber musicians to folk artists. Similarly, the secondary studio is designed for interviews and theatrical productions. Since all control rooms are used for voice announcements, the sound field perception in all such rooms regardless of size matches that in the secondary studio. Similarly, the sound of monitor speakers is uniform from room to room. To achieve these objectives, the sound fields of existing and planned rooms were computer modeled also assuring that changes required during architectural design and construction could be monitored. [A tour of the facility will follow paper presentation; see tour announcements.]
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