Characterizing the Audibility of Sound Field with Diffusion in Architectural Spaces.

Architectural Acoustics;Diffusion;Audibility;Architecture;Arts;Architecture

Utami, Sentagi SesotyaConrad, Frederick G. ;

University of Michigan

关键词: Architectural Acoustics;    Diffusion;    Audibility;    Architecture;    Arts;    Architecture;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/93826/sentagi_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

The significance of diffusion control in room acoustics is that it attempts to avoid echoes by dispersing reflections while removing less valuable sound energy. Some applications place emphasis on the enhancement of late reflections to promote a sense of envelopment, and on methods required to measure the performance of diffusers. What still remains unclear is the impact of diffusion on the audibility quality due to the geometric arrangement of architectural elements. The objective of this research is to characterize the audibility of the sound field with diffusion in architectural space. In order to address this objective, an approach utilizing various methods and new techniques relevant to room acoustics standards was applied. An array of microphones based on beam forming (i.e., an Acoustic Camera) was utilized for field measurements in a recording studio, classrooms, auditoriums, concert halls and sport arenas. Given the ability to combine a visual image with acoustical data, the impulse responses measured were analyzed to identify the impact of diffusive surfaces on the early, late, and reverberant sound fields. The effects of the room geometry and the proportions of the diffusive surfaces were observed by utilizing computer simulations. The diffuseness in each space was measured by coherences from different measurement positions along with the acoustical conditions predicted by objective parameters such as T30, EDT, C80, and C50. Noticeable differences of the auditory experience were investigated by utilizing computer-based survey techniques, given the current software auralization capabilities. The results based on statistical analysis demonstrate the users’ ability to localize the sound, and to distinguish the intensity, clarity, and reverberation created within the virtual environment.The impact of architectural elements in diffusion control is evaluated by the design variable interaction, objectively and subjectively. The effectiveness of the diffusive surfaces is determined by the echo reduction and the sense of complete immersion in a given room acoustics volume. The application of such methodology at various stages of design provides the ability to create a better auditory experience by the users. The results based on the cases studied have contributed to the development of new acoustical treatment based on the diffusion characteristics.