Correction of Acoustics in Historic Opera Theatres with the Use of Schroeder Diffuser

• Autorzy: Kamisiński T.
• Języki publikacji: EN

Abstrakty

EN

The paper deals with the problem of acoustic correction in historic opera theatres with the auditorium layout in the form of a horseshoe with deep underbalcony cavities limited with a semicircular wall surface. Both geometry of the cavities and excessive sound absorption determine acoustic phenomena registered in this area of the hall. The problem has been observed in the Theatre of Opera and Ballet in Lviv, Ukraine, where acoustic tests were carried out, simulation calculations performed, and finally a diffusion panel worked out designed for the rear wall of the underbalcony space. Acoustic measurements carried out after installation of the diffusers revealed favourable changes in the sound strength factor G within the range of medium and high frequencies in the underbalcony and auditorium centre area. By replacing textile tapestry with diffusion panels, a significant reduction of sound absorption was achieved for the frequency range above 1 kHz and an increase of uniformity of acoustic parameters registered in the hall. The method presented in the paper can be applied in historic halls of the similar type as well as contemporary rooms where there is a need for correction of acoustic flaws related to sound focusing or the echo effect.

Słowa kluczowe

EN

opera house; Schroeder diffusers; Lviv; underbalcony; horseshoe plan; focusing; scattering

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2012
• Tom: Vol. 37, No. 3
• Strony: 349--354
• Opis fizyczny: Bibliogr. 11 poz., fot., rys.

Twórcy

autor

Kamisiński T.

• AGH University of Science and Technology al. A. Mickiewicza 30, 30-059 Kraków, Poland,

Bibliografia

• 1. Cox T.J., D'Antonio P. (2004), Acoustic Absorbers and Diffusers, Taylor & Francis Ltd, 2nd Ed., London.
• 2. Cox T.J., D'Antonio P. (2003), Engineering art: the science of concert hall acoustics, Interdisciplinary Science Reviews, 28, 2, 1119-1129.
• 3. Gołaś A., Suder-Dębska K. (2008), Analysis of Dome Home Hall Theatre Acoustic Field, Archives of Acoustics, 34, 3, 273-293.
• 4. Iannace G., Ianniello E. (2008), Sound-focusing effects in the plan of horse-shoe shaped opera theatres, Proceedings of Acoustics' 08, pp. 2151-2156, Paris.
• 5. Kamisiński T., Kinasz R., Pilch A., Rubacha J. (2009), Experimental study of acoustic parameters of the Lviv opera house concert hall [in Polish], Proceedings of 16th Conference on Acoustic and Biomedical Engineering, pp. 16-17, Kraków-Zakopane.
• 6. Kamisiński T., Rubacha J., Pilch A. (2010a), The Study of Sound Scattering Structures for the Purposes of Room Acoustics Enhancement, Acta Physica Polonica A, 118, 1, 83-86.
• 7. Kamisiński T., Kinasz R., Pilch A., Rubacha J. (2010b), Acoustical correction of underbalcony cavities in Lviv Opera Hall [in Polish], Technical Transactions, 107, 8, 7-14.
• 8. Kulowski A. (2011), Acoustics of Halls, [in Polish: Akustyka Sal ], Wydawnictwo PG, Gdańsk.
• 9. Miśkiewicz A., Rogala T., Rościszowska T., Rudzki T., Fidecki T. (2012), Concert Hall Sound Clarity: A Comparison of Auditory Judgments and Objective Measures, Archives of Acoustics, 37, 1, 41-46.
• 10. Pilch A., Kamisiński T. (2011), The Effect of Geometrical and Material Modification of Sound Diffusers on Their Acoustic Parameters, Archives of Acoustics, 36, 4, 955-966.
• 11. Standard ISO 17497-1 (2004), Sound scattering properties of surfaces. Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room