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dc.contributor.authorYilmazer, S.en_US
dc.description.abstractThe 4000 seated multi-purpose hall Bilkent Amphitheater is a semi-closed amphitheater with a large volume of 90,000 m3.At the beginning, the amphitheater was designed only for open-air performances. Afterwards it was decided to be roofed with a tensile membrane in order to protect the spectators against atmospheric effects. However, the covered amphitheater was turned into a very resounding and a problematic place with a reverberation time even more than 6 s. when the hall is unoccupied. After that time, some acoustical interventions were implemented, but these have not been sufficient in decreasing the number of problematic areas of echoes and dead spots. In 2000, Akukon Oy Consulting Engineers, Finland, carried out the real-size measurements when the hall was unoccupied, in order to find out the values of different acoustical parameters. In 2004, the computer simulation of the hall for the unoccupied condition was made [2]. In order to test speech intelligibility in the hall, besides the computer simulation and real size measurements, in 2006, articulation testing (AI) was made by using normal hearing listeners in the hall. In this paper, comparison between the measurements and the experimental studies are presented. Results confirm that excessive values of reverberation time cause too much reverberant and liveliness throughout the hall, besides the lack of warmth subjectively. Clarity is undermined by excessive reverberate and the sound becomes blurred. Sound energy are not satisfactory in reflecting the sound sufficiently through the hall and the direct sound becomes insufficient at some locations as back and mid sides.en_US
dc.source.titleTurkish Acoustical Society - 36th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2007 ISTANBULen_US
dc.subjectAcoustical parametersen_US
dc.subjectAtmospheric effectsen_US
dc.subjectComparison studyen_US
dc.subjectConsulting engineersen_US
dc.subjectDead spoten_US
dc.subjectExperimental studiesen_US
dc.subjectLarge volumesen_US
dc.subjectNormal-hearing listenersen_US
dc.subjectReal sizesen_US
dc.subjectReverberation timeen_US
dc.subjectSound energyen_US
dc.subjectTensile membraneen_US
dc.subjectArchitectural acousticsen_US
dc.subjectComputer simulationen_US
dc.subjectSpeech intelligibilityen_US
dc.subjectAcoustic noiseen_US
dc.titleA comparison study on sound defects of Bilkent Amphitheatre in terms of intelligibility of the speechen_US
dc.typeConference Paperen_US
dc.departmentDepartment of Interior Architecture and Environmental Designen_US

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