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Measurement of Total Sound Energy Density in Enclosures at Low Frequencies Abstract of Paper View metadata,Downloaded citation and from similar orbit.dtu.dk papers on:at core.ac.uk Dec 17, 2017 brought to you by CORE provided by Online Research Database In Technology Measurement of total sound energy density in enclosures at low frequencies Abstract of paper Jacobsen, Finn Published in: Acoustical Society of America. Journal Link to article, DOI: 10.1121/1.2934233 Publication date: 2008 Document Version Publisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Jacobsen, F. (2008). Measurement of total sound energy density in enclosures at low frequencies: Abstract of paper. Acoustical Society of America. Journal, 123(5), 3439. DOI: 10.1121/1.2934233 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. WEDNESDAY MORNING, 2 JULY 2008 ROOM 242B, 8:00 A.M. TO 12:40 P.M. Session 3aAAa Architectural Acoustics: Case Studies and Design Approaches I Bryon Harrison, Cochair 124 South Boulevard, Oak Park, IL, 60302 Witew Jugo, Cochair Institut für Technische Akustik, RWTH Aachen University, Neustrasse 50, 52066 Aachen, Germany Contributed Papers 8:00 The detailed objective acoustic parameters are presented for measurements 3aAAa1. Acoustic and audience response analyses of eleven Venetian in four concert halls in Istanbul. The halls are used by many different per- churches. Davide Bonsi ͑The Acoustics Lab., Fondazione Scuola di San formances, from concerts to ballet or opera. The measured octave band Giorgio, Isola di San Giorgio Maggiore, I-30124 Venezia, Italy, quantities are RT, EDT, G,C80 and D50. [email protected]͒, Malcolm Longair ͑Cavendish Lab., University of Cambridge, JJ Thomson Avenue, CB3 0HE Cambridge, UK, [email protected]͒, Philip Garsed ͑Dept. of Engineering, University of Cambridge, Trumpington Street, CB2 1PZ Cambridge, UK, [email protected]͒, Raf Orlowski ͑Arup Acoustics, St Giles Hall 8:40 ͒ Pound Hill, CB3 0AE Cambridge, UK, [email protected] 3aAAa3. Computer modelling and simulation of sound field in 24 ͑ A research project has been carried out by the University of Cambridge rectangular concert halls. Andrzej K. Klosak Institute of Building Ma- ͑UK͒, Arup Acoustics ͑Cambridge, UK͒ and the Fondazione Scuola di San terials and Structures, Faculty of Civil Eng., Cracow University of Technol- Giorgio-CNR ͑Venice, Italy͒ with the purpose of investigating the relation- ogy, Warszawska 24, 31-155 Cracow, Poland, [email protected]͒ ship between music and the architectural spaces within which it was per- Extensive acoustics computer simulations has been made using Odeon formed in the context of Venetian vocal polyphony during the 16th century. computer simulation software. From 300 to 850 measurements positions The most representative churches ͑San Marco, Parish churches, hospitals ͒ have been analysed in 24 rectangular rooms representing Љshoe-boxЉ type and monasteries were selected for this study and the music was performed 3 3 within them by the Choir of St John’s College of Cambridge University. concert halls with volumes of 8 000m , 12 000m and 16 000m . In total 14 Members of the audience completed questionnaires assessing the acoustic 000 receiver positions have been analysed. For each receiver position eight 3a WED. AM qualities of the spaces. The results of the audience and expert scores were objective measures have been calculated, in particular Reverberation Time ͑ ͒ ͑ ͒ ͑ ͒ ͑ ͒ then statistically analyzed and correlated with a set of room acoustic indices T30 , Early Decay Time EDT , Clarity C80 , Strength G, Gearly,Glate , ͑ ͒ ͑ ͒ which had been measured in the same locations. In the present paper tech- Early Lateral Energy Fraction LF80 and Late Lateral Strength GLL . Most nical aspects of the experiments and the data analysis will be illustrated. The of measures have been calculated in six octave bands from 125Hz to principal conclusions were as follows: 1. There is a strong correlation be- 4000Hz. Extensive amount of generated data required developing of new tween the subjective impression of reverberance with EDT and T30 and mu- methods for processing, comparing and graphical presentation of results. sical clarity with C80; 2. A grouping of the churches by typology was found Those methods together with description of modelling and simulation pro- by analysing the reverberation times; 3. The poor quality of clarity was as- cedures are described in this paper. sessed for churches with longest EDT for the performance of music involv- ing polyphony. 8:20 9:00 3aAAa2. A Comparative Study of Four Concert Halls in Istanbul: 3aAAa4. Improvement of acoustic conditions in a historical interior by Correlation of Subjective Evaluation with Objective Acoustic means of a DSP-controlled sound-reinforcement system. Tadeusz Parameters. Nurgun Bayazit Tamer ͑Istanbul Technical University, Fidecki ͑F. Chopin Academy of Music, Okolnik 2, 00-368 Warszawa, Po- ͒ Taskisla Taksim Istanbul, 34437 Istanbul, Turkey, [email protected] , Anil land, fi[email protected]͒, Andrzej Miskiewicz ͑F. Chopin Academy of ͑ Vural Istanbul Technical University, Taskisla Taksim Istanbul, 34437 Istan- Music, Okolnik 2, 00-368 Warszawa, Poland, [email protected]͒, Jan ͒ bul, Turkey, [email protected] Zera ͑Centr. Inst. for Labour Prot. - Natl. Res. Inst., Czerniakowska 16, 00- In the studies of room acoustics, the parameters that are taken into con- 701 Warsaw, Poland, [email protected]͒ sideration while evaluating the acoustic performance of a hall are examined Stringent building conservation requirements in historical interiors pose in two sections: objective acoustic parameters which can be measured and substantial limitations in acoustical treatment and sound reinforcement sys- calculated and, subjective acoustic parameters which define the impacts of a tems used to secure proper sound quality. This presentation discusses the hall’s acoustical qualities over the audiences. During the first half of the cen- tury, the reverberation time was considered to be the most important objec- means undertaken to improve the acoustic conditions in the historic Great tive acoustic parameter which defined the acoustic quality of a hall. But, the Ballroom of the Royal Castle in Warsaw. Originally, the room was too re- ͑ ϭ ͒ later studies indicated that this parameter wasn’t sufficient alone to define a verberant T30 2.9 s at 500 Hz what resulted in a lack of clarity of per- ͑ Ͻ ͒ subjective evaluation. Consequently, studies have been made to define the formed music and poor speech intelligibility STI 0.3 . A precise laser subjective influence on people from the acoustic performance of a hall. In scan of the interior was made to obtain input data for a computer acoustic this study, it has been attempted to define the statistical correlation between model of the room. This model was used for selection of a DSP-controlled the subjective evaluation of the acoustic characteristics of the four concert sound reinforcement system to improve listening conditions for speech and halls, which was done by the members of orchestra together with the ordi- music. ͓Work supported by the Polish Ministry of Science and Higher Edu- nary concert-goers, and their objective acoustic parameters are explained. cation, grant No. R17 004 02͔. 3353 J. Acoust. Soc. Am., Vol. 123, No. 5, Pt. 2, May 2008 Acoustics’08 Paris 3353 9:20 noise mapping undertaken for the Valley, and this paper discusses the results 3aAAa5. On the acoustics of a specifically designed library discussion of the cost benefit study undertaken into the acoustic treatment of selected room with corrugated ceiling. Nico F. Declercq ͑Georgia Tech Lorraine - venues. The purpose of this work was to provide Council with information G.W. Woodruff School of ME, UMI Georgia Tech - CNRS 2958, 2 rue Mar- on both the feasibility of treating the entertainment venues to reduce noise coni, 57070 Metz, France, [email protected]͒, Katrien emissions and the order of cost for the treatments. The study of four venues Dewijngaert ͑Georgia Tech Lorraine - G.W. Woodruff School of ME, UMI found that attenuation of 3 - 22dB͑A͒ or 1 - 17dB͑C͒ could be achieved with Georgia Tech - CNRS 2958, 2 rue Marconi, 57070 Metz, France, asociated costs ranging from $30,000 to over $400,000 ͑Australian dollars͒. [email protected]͒, Katelijn Vanderhaeghe ͑Georgia Tech Lorraine - G.W. The costing work provided invaluable knowledge in the development of the Woodruff School of ME, UMI Georgia Tech - CNRS 2958, 2 rue Marconi, Valley Music Harmony Plan. 57070 Metz, France, [email protected]͒, Patricia Verleysen ͑Ghent Uni- versity, Mechanics of Materials and Structures, Sint-Pietersnieuwstraat 41, 10:20-10:40 Break 9000 Ghent, Belgium, [email protected]͒ There is a discussion room at the library of Viipuri in Finland where the 10:40 ceiling has been especially designed to enhance the acoustics and make ev- 3aAAa8. Open-air theatre in the centre of the city: Acoustic design and ery position within the room acoustically equivalent. In other words no mat- noise environment control. Nicolaos Barkas ͑Democritus University of ter where a speaker is standing, he is supposed to be heard equally well all Thrace Greece, Vas. Sofias street 1, Department of Architecture, 67100 over the room.
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