擴散板之音響散射性能對小型聆聽空間聲場之影響

Effects of Wooden Diffusers on the Small Listening Room

沈美惠(Mei-Huei Shen)；賴榮平(Rong-Ping Lai)；林芳銘(Fang-Ming Lin)；洪忠武(Jung-Wu Hung)

擴散板 ； 散射係數 ； 小型聆聽室 ； 電腦模擬 ； Diffusers ； Scattering Coefficient ； Small Listening Room ； Computer Model

建築學報

84期（2013 / 06 / 30）

1 - 16

繁體中文

The sound-scattering performance of wooden interior decoration material is an important influential factor that dominate indoor sound design. Good sound-scattering performance help the consistent spatial distribution of sound energy and improves sound quality. The study doe the experiment with the sound- scattering performance of wooden interior decoration material in the Reverberation lab. To analyze the different type of wood n material and sequences. Experimental result for diffusers made of six different materials ( Hardwood、Softwood、plywood、Medium density fiberboard, MDF、Moso bamboo、Heat-treated Wood ) , supplemented by QRD prime structure variable, are found to improve average high frequency ( 3 15-5k Hz ) scattering performance by more than 10%, with MDF diffusers of 1k, 1.25k Hz providing optimal scattering at 20% above average, resulting in the scattering performance of the various material improving through the QRD sequence ( P＜0.05 ) . The experimental results presented here can be used as a reference for indoor acoustic performance. In the second stage, a diffuser placed in an empty room to determine a positive correlation between the test and computer simulation (R2=0.80). The simulation' input parameters were then used to objectively evaluate (reverberation time & clarity) the difference between the computer simulation and the actual room. Results showed a 60% increase in the decoration rate effectively reduced reverberation time (630 to 5k Hz, the RT is reduced to 1 sec.), while a decoration rate below 40% could also maintain a good degree of clarity.

The sound-scattering performance of wooden interior decoration material is an important influential factor that dominate indoor sound design. Good sound-scattering performance help the consistent spatial distribution of sound energy and improves sound quality. The study doe the experiment with the sound- scattering performance of wooden interior decoration material in the Reverberation lab. To analyze the different type of wood n material and sequences. Experimental result for diffusers made of six different materials ( Hardwood、Softwood、plywood、Medium density fiberboard, MDF、Moso bamboo、Heat-treated Wood ) , supplemented by QRD prime structure variable, are found to improve average high frequency ( 3 15-5k Hz ) scattering performance by more than 10%, with MDF diffusers of 1k, 1.25k Hz providing optimal scattering at 20% above average, resulting in the scattering performance of the various material improving through the QRD sequence ( P＜0.05 ) . The experimental results presented here can be used as a reference for indoor acoustic performance. In the second stage, a diffuser placed in an empty room to determine a positive correlation between the test and computer simulation (R2=0.80). The simulation' input parameters were then used to objectively evaluate (reverberation time & clarity) the difference between the computer simulation and the actual room. Results showed a 60% increase in the decoration rate effectively reduced reverberation time (630 to 5k Hz, the RT is reduced to 1 sec.), while a decoration rate below 40% could also maintain a good degree of clarity.

1. 蔡岡廷、賴榮平(2009)。花旗松穿孔構造吸音性能之研究。建築學報增刊（技術專刊），68，1-14。
   連結：
2. ISO 17497-1 (2004). Acoustics-sound-scattering Properties of Surfaces - Part 1: Measurement of the Random-incidence Scattering Coefficient in a Reverberation Room. Geneva, Switzerland: International Organization for Standardization.
3. Beranek, L. L.(1992).Concert hall acoustics.Journal of the Acoustical Society of America,92(1),1-39.
4. Cox, T. J.,D''Antonio, P.(2000).Acoustic phase gratings for reduced specular reflection.Applied Acoustics,60(2),167-186.
5. D''Antonio, P.,Trevor, J. C.(2000).Diffusor application in rooms.Applied Acoustics,60(2),113-142.
6. Hargreaves, T. J.,Cox, T. J.,Lam, Y. W.(2000).Surface diffusion coefficients for room acoustics: Free-field measures.Journal of the Acostical Society of America,108(4),1710-1720.
7. Jeon, J.Y., Lee, S. C.,Vorländer, M.(2004).Development of scattering surfaces for concert halls.Applied Acoustics,65(4),341-355.
8. Kubojima, Y.,Okano, T.,Ohta, M.(2000).Bending strength and toughness of heat-treated wood.Journal of Wood Science,46(1),8-15.
9. Lin, F. M.,Hong, P. Y.,Lee, C. Y.(2010).An experimental investigation into the sound-scattering performance of wooden diffusers with different structures.Applied Acoustics,71(1),68-78.
10. Schroeder, M. R.(1979).Binaural dissimilarity and optimum ceilings for concert halls: More lateral sound diffusion.Journal of the Acoustical Society of America,65(4),958-963.
11. Syrjänen, T.,Oy, K.(2001).Production and classification of heat-treated wood in Finland.Review on Heat Treatments of Wood,Brussels, BEL:
12. Warusfel, O.,Denayrou, R.,Jullien, J. P.(1992).Validation of a computer model environment for room acoustics prediction.Proceedings of the 14th International Congress on Acoustics,Beijing, China:
13. Zeng, X.,Christensen, C. L.,Rindel, J. H.(2006).Practical methods to define scattering coefficients in a room acoustics computer model.Applied Acoustics,67(8),771-786.
14. Zha, X.,Fuchs, H. V.,Drotleff, H.(2002).Improving the acoustic working conditions for musicians in small spaces.Applied Acoustics,63(2),203-221.
15. 江維華、胡煌堯、林葳、吳惠萍(2005)。台北蘆洲功學社音樂廳音響性能設計。中華民國音響學會第18屆學術研討會論文集，台北市=Taipei:
16. 佐久間哲哉(2005)。室內音響における最近の話題－壁面の拡散性解析及び評価法。日本音響學會誌，61(1)，39-44。
17. 杜銘秋(1993)。台南市=Tainan，國立成功大學建築研究所=Department of Architecture, National Cheng Kung University。
18. 林芳銘、黃琨智、林君達(2008)。室內裝修形狀及散射性能對空間聲場之影響。臺灣建築學會第20屆第2次建築研究成果發表會論文集，台北市=Taipei:
19. 林容聖(1999)。台北市=Taipei，國立台灣科技大學建築研究所=Department of Architecture, National Taiwan University of Science and Technology。
20. 張豐丞(2002)。台北市=Taipei，國立臺灣大學森林學研究所=School of Forestry and Resource Conservation, National Taiwan University。
21. 陳信富(2006)。台中市=Taichung，朝陽科技大學建築及都市設計研究所=Graduate School of Architecture and Urban Design, Chaoyang University of Technology。
22. 劉德源、李君輝(2006)。建築聲場清晰度與殘響時間模擬計算及實驗之比較。中華民國音響學會第十九屆學術研討會論文集，台北市=Taipei: