Archives of Acoustics, 41, 4, pp. 683–690, 2016
10.1515/aoa-2016-0065

A Comparison of Handgun Shots, Balloon Bursts, and a Compressor Nozzle Hiss as Sound Sources for Reverberation Time Assessment

Piotr SZŁAPA
Institute of Occupational Medicine and Environmental Health, Sosnowiec
Poland

Marta BOROŃ
Institute of Occupational Medicine and Environmental Health, Sosnowiec

Jolanta ZACHARA
Institute of Occupational Medicine and Environmental Health, Sosnowiec

Wojciech MARCZAK
Institute of Occupational Medicine and Environmental Health, Sosnowiec
Poland

Blank handgun shots, party balloon bursts, and a pneumatic compressor with a small-diameter nozzle were used as sources of sound in the assessments of reverberation time, $T$. The two first sources were of impulse type, while the third one resembled a noise signal source. In this work, 532 values of $T$ were experimentally obtained in four rooms of different volumes and compared. The $T$ values for 1/3 octave frequency bands were found to be independent of the sound source. Reverberation times for the A-frequency-weighting filtered signals were close to one another for the shots and balloon bursts, while those obtained using the compressor nozzle were significantly shorter. The latter effect can be attributed to the relatively high share of high frequency waves in the sound generated by the nozzle. The results show that balloon bursts can be used as handgun shot substitutes in the assessments of reverberation times. While the nozzle noise is rather unsuitable for this purpose, it can be applied in the assessments of $T$ for high frequency waves, up to the ultrasound range. Such acoustic climate information may be useful in designing spaces for high frequency sound-sensitive individuals, e.g. animal shelters.
Keywords: reverberation; impulse method; room acoustics; acoustic impact.
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References

ARETZ M., ORLOWSKI R. (2009), Sound strength and reverberation time in small concert halls, Appl. Acoust., 70, 1099–1110.

BERANEK L. L. (1993), Acoustics, Acoustical Society of America, New York.

BOOTHROYD A. (2002), Room acoustics and speech perception, San Diego State University. http://www-rohan.sdsu.edu/~aboothro/files/Papers_on_RoomAcoustics/ Roomacousticsandspeechperception.pdf

BROCH J. T., JENSEN V. N. (1966), On the Measurement of Reverberation, Bruel and Kjaer Technical Review No. 4-1966.

CARVALHO A. P. O. (1995), The use of the Sabine and Eyring reverberation time equations to churches, 129th meeting of the Acoustical Society of America, Washington DC. http://paginas.fe.up.pt/~carvalho/asa129.pdf; abstract: CARVALHO A. P. O. (1995) J. Acoust. Soc. Am., 97, 3319.

CHIA-JEN YU, JIAN KANG (2009), Environmental impact of acoustic materials in residential Buildings, Building and Environment, 44, 2166–2175.

CRANDELL C. C., SMALDINO J. J. (2002), Classroom Acoustics for Children With Normal Hearing and With Hearing Impairment, Lang. Speech Hear. Serv. Sch., 31, 362–370.

DÍAZ C., PEDRERO A. (2005), The reverberation time of furnished rooms in dwellings, Appl. Acoust., 66, 945–956.

EGGENSCHWILER K. (2005), Lecture Halls - Room Acoustics and Sound Reinforcement, 4th European congress on acoustics (Forum Acusticum 2005), Budapest, Hungary, 2059–2064

ENGEL Z., KOSAŁA K. (2004), Reverberation indices in acoustic assessments of sacral structures, Arch. Acoust., 29, 45–59.

HEFFNER H. E., HEFFNER R. S. (2007), Hearing Ranges of Laboratory Animals, J. Am. Assoc. Lab. Anim. Sci., 46, 11–13.

HORVAT M., JAMBROSIC K., DOMITROVIC H. (2007), Methods of measuring the reverberation time, 3rd Congress of the Alps Adria Acoustics Association, Graz – Austria.

IANNACE G., TREMATERRA A. (2014), The acoustics of the caves, Appl. Acoust. 86, 42–46.

IEC 61672-1 (2013) Electroacoustics. Sound level meters. Part 1: Specifications.

ISO 11204:1995 E, Acoustics – Noise emitted by machinery and equipment – Measurement of emission sound pressure levels at work station and at other specified positions – Method requiring environmental corrections.

ISO 3382-1:2009. Acoustics – Measurement of room acoustic parameters – Part 1: Performance spaces.

ISO 3382-2:2010, Acoustics – Measurement of room acoustic parameters – Part 2: Reverberation time in ordinary rooms.

KLATTE M., HELLBRÜCK J. (2010), Effects of classroom acoustics on performance and wellbeing in elementary school children: A field study, Proceedings of the 39th International Congress on Noise Control Engineering, Internoise 2010, Lisbon. https://www.sowi.uni-kl.de/psychologie-ii/publications/of-maria-klatte/#c1869.

KLATTE M., HELLBRÜCK J., SEIDEL J., LEISTNER P. (2010), Effects of classroom acoustics on performance and wellbeing in elementary school children: A field study, Environment and Behavior, 42, 659–692.

KOSAŁA K., ENGEL Z. W. (2013), Assessing the acoustic properties of Roman Catholic churches: A new approach, Appl. Acoust., 74, 1144–1152.

MAŠOVIĆ D., ÖĞÜÇ M. (2013), Analysis of Reverberation Time Field Measurement Results in Building Acoustics, Telfor Journal, 5, 145–150.

NELSON P. B., SOLI S. D., SELTZ A. (2002), Classroom Acoustics II. Acoustical Barriers to Learning, Technical Committee on Speech Communication of the Acoustical Society of America, Melville NY. http://asa.aip.org/classroom/bookletII.pdf

OPERA HOUSE ACOUSTICS (2011), Proceedings of the 17th International Congress on Acoustics, Rome 2011, http://www.icacommission.org/Proceedings/ICA2001Rome/5_09.pdf

PASSERO C. R. M., ZANNIN P. H. T. (2010), Statistical comparison of reverberation times measured by the integrated impulse response and interrupted noise methods, computationally simulated with ODEON software, and calculated by Sabine, Eyring and Arau-Puchades’ formulas, Appl. Acoust., 71, 1204–1210.

RASMUSSEN B., BRUNSKOG J., HOFFMEYER D. (2012), Reverberation time in class rooms – Comparison of regulations and classification criteria in the Nordic countries, Proceedings of Joint Baltic-Nordic Acoustics Meeting, Odense, Denmark. https://www.researchgate.net/publication/233729033_Reverberation_time_in_class_rooms_-_Comparison_of_regulations_and_classification_criteria_in_the_Nordic_countries

RUDNO-RUDZIŃSKI K., DZIECHCIŃSKI P. (2006), Reverberation time of Wrocław Opera house after restoration, Arch. Acoust., 31, 247–252.

STATSOFT, INC. (2011). STATISTICA (data analysis software system), version 10. www.statsoft.com

SUMARAC-PAVLOVIC D., MIJIC M., KURTOVIC H. (2008), A simple impulse sound source for measurements in room acoustics, Appl. Acoust., 69, 378–383.

YANG DAHENG, ,LI QI (2012), Research of Computer Simulation of Reverberation Time in Classroom, Physics Procedia, 33, 1677–1682.

YAN ZHANG (2005), A Method to Predict Reverberation Time in Concert Hall Preliminary Design Stage, PhD Dissertation, Georgia Institute of Technology. https://smartech.gatech.edu/bitstream/handle/1853/7452/yan_zhang_200512_phd.pdf




DOI: 10.1515/aoa-2016-0065

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