The Determination of Acoustical Absorbing Materials in The “Al-Marwah” Room of “Al-Akbar” Mosque in Surabaya using Objective Parameters Approximation

Wiratno A. Asmoro

Abstract


The room that used to hold the speech activity needs a good acoustical quality. To determine the acoustical quality of a room the experimental research was conducted to find the relationship between the determination of acoustical absorbing materials and speech intelligibility in the “Al-Marwah” room of “Al-Akbar mosque in Surabaya. Through the monaural acoustical measurements, the objective acoustical parameters in the “Al-Marwah” room can be found from impulse responses. Then we can use it to determine the acoustical absorbing materials in the room. Considering the acoustical parameters of RT, EDT, D50, C50, and %Alcons at several positions, we can find the relationships between those parameters. The result, then, could be used to properly judge the acoustical absorbing materials which should be applied in the room. For the acoustical treatments on the ceiling of 376 m2 and the pillars of 373 m2 in the “Al-Marwah” room of the “Al-Akbar” mosque, the average values of RT and EDT un mid-band frequencies were found 5.52 sec and 7.88 sec respectively; whereas the values of D50, C50 and %Alcons were found in the range of 3.25  10.5%, -15  -9,4 dB and 15  21% respectively. Those condition produce speech intelligibility on Poor to Sufficient category.

Keywords


Acoustical Absorbing Materials; Objective Acoustical Parameter; Speech Intelligibility

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References


Asmoro, W.A. (2002), ‘Akustik Ruang dan Sistem Audio: Kajian Teori dan Aplikasinya’. Seminar Nasional Fisika, Universitas Negeri Yogyakarta.

Barron, M. (1993), Auditorium Acoustics and Architectural Design, E & FN Spon, London.

Bistafa, S.R. dan Bradley, J.S. (2000), ‘Reverberation Time and Maximum Background Noise Level for Classroom from a Comparative Study of Speech Intelligibility Metrics’. J. Acoust. Soc. Am., Vol. 107(2), pp. 8611-875.

Campanella, A.J. (1995), ‘Preliminary Values of Clarity and Intelligibility for Small Auditoria, Meeting and Teleconference Room’. The 129th meeting of ASA 1 June, Washington DC. Internet:

Carvalho, A.P.O. (2000), ‘Acoustical Measures in Churches Porto’s Clerigos Church, a Comprehensive Example’. 7th Int. Cong. Sound & Vib. 4-7 July, Garmisch-Partenkirchen, Germany

Carvalho, A.P.O., Morgado, A., Henrique, L. (1997), ‘Relationship Between Speech Intelligibility and Objective Acoustical Parameters or Architectural Features in Catholic Churches’. NOISE-CON 97 The Pennsylvania State University, June 14-15, Pennsylvania

Cremer, L. dan Muller, H.A. (1982), ‘Principles and Application of Room Acoustics Vol. I’. Translated by Schultz, T.J., Applied Science, London.

Kuttruff, H. (1979), Room Acoustics, Applied Science Publisher Ltd., London.

Lam, Y.W. (1995), Acoustics of Enclosed Spaces. The University of Salford.

Muller, H.A. (1993), ‘Room Acoustical Criteria and their Meaning’, Proc. of the Conference “Acoustics and Recovery of Spaces for Music”, Ferrara.

Reynold, D.D. (1981), Engineering Principles of Acoustics: Noise and Vibration Control, Allyn & Bacon, Inc., Boston.

Riandadari, D. dan Asmoro, W.A. (2002), ‘Analisis Karakteristik Akustik Terhadap Tingkat Kejelasan Pembicaraan Didalam Masjid Al-Akbar Surabaya’, Seminar Tugas Akhir, Jurusan Teknik Fisika FTI-ITS.

Smith, BJ., Peter, R.J., dan Owen, S. (1996), Acoustics and Noise Control, Addison Wesley Longman Ltd., Essex.

Steeneken, H.J.M. (1999), ‘The Measurement of Speech Intelligibility’, J. Acoust. Soc. Am., Vol. 67, pp. 318-326.




DOI: http://dx.doi.org/10.12962/j20882033.v18i2.175

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