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<i title="Acoustical Society of America (ASA)">
<a target="_blank" rel="noopener" href="https://fatcat.wiki/container/hwn3tbm3t5cpnjcflcmmwnprc4" style="color: black;">Journal of the Acoustical Society of America</a>
Since early 1983, the General Cinema Corporation has • engaged in a major expansion and renovation program of its movie theatre complexes throughout the United States. Furthermore, recent developments in motion picture presentation technology involving films with extended dynamic and frequency ranges have led to reconsideration of and, in some ca•a, adaptation of conventional criteria for evaluating the acceptability of theatres for viewing and listening to films. The results of field measur•<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1121/1.2023451">doi:10.1121/1.2023451</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/azf66ehedjhopeom7ryftavom4">fatcat:azf66ehedjhopeom7ryftavom4</a> </span>
more »... nts (octave-band reverberation times, room-to-room NR'S, and backø ground sound-pressure levels) are reported for a large number of facilities including data for the often disregarded 31.5-, 63~, and gr-Hz bands. The considerations in obtaining adequate field data and in developing criteria, as weft as practical cost effective acoustical control measures developed for new generation theatres, are reviewed. 9:.15 A2. An integrated approach to office sennsties in the COmputeF age. Hsien-Sheng (Jason) Pei (Digital Equipment Corporation, 30 FoVoes Road, NR05/J2, Northboro, MA 01532) The building environmental control system and computer/business equipment are two major noise sources in modern office buildings. This paper focuses on the technical challenges that must be addressed by the acoustical engineers in the design of office acoustics in the computer age. In several important areas (such as standards, design tools, technology development, etc.), integration is examined in some detail. The state-ofthe-art of building environmental control systems and computer cooling systems will be reviewed. Technology integration potenthis will be presented. A case study of integration is demonstrated. Current and future research needs are identified. 9'3O A3. Noise control of •mnkin• bllM!!eas equipment. S. P. Ying (Gilbert/ Commonwealth, P.O. Rox 149g, Reading, PA 19603) NOise control of three kinds ofbuslness equipment, namely, document printer, currency dispenser, and endorser/encoder, was investigated. These machines which ns• microprocessors as the control devices were developed re•ntly for use in banking. During the development or ira-provement stage, an acoustic improvement program for each kind of equipment was initiated with sound power level determination, followed by noise diagnostic tests using the coherence function technique. One of the common noise sources in the equipment was the broadband printing noise which was radiated directly from the printing head and through machine structures. The currency dispeuser had gear noise which resonated with the machine structure at the gear mesh frequency. Recommendations for noise reduction included ufdization of sound absorption foam inside cabinets, increase of sound transmission loss of machine cases, sound isolation for structure-borne noise, and treatments of openings. Test results of some of these improvements are presented. A4. Reducing the aural detectability of a 30-kW motor-generator set. G. R. Garinther (U.S. Army Laboratory Command, Human Engineering Laboratory, Al•rdeen Proving Ground, bid 21005-5001 ) The noise produced by motor-generator sets in Army field situations causes detectability and speech intciligibility problems. A program for computing the aural detectability distance of Army materiM was developed and used to guide a noise reduction ctfort for this generator. A field expedient solution was pursued which was developed through the testing of a number of increasingly complicated barriers and enclosures. This report describes the procedure used and shows the l/3-octave band level, the insertion loss, and the detectability contour obtained for each confignration. The insertion loss values are compared to thenry, and cooling problems associated with noise reduction of generator sets are discussed. The final enclosure configuration attmuated energy in those low frequencies which cause detection, by up to 20 dB, and reduced computed detectability from 1000 to 200 m. The use of such a program can be of assistance, for the development of Army material, and for directing noise control efforts to those frequencies which control aural detectability. AS. Low-frequency noise in jet engine test facilities.
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