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Experimental Investigation on Varied Degrees of Sound Field Diffuseness in Full Scale Rooms

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Sound field diffusion in enclosures should be experimentally quantified based on measured room impulse responses, at least to know how many scattering surfaces produce a sufficiently diffuse sound field for each application. To achieve this a parameter, the Sound Field Diffusion Coefficient (SFDC) which is still under development, was applied. SFDC expresses the reflection's amplitude control and temporal distribution gaussianity, using third octave-band energy-decay compensated impulse responses and taking reference with SFDC average results from a set of impulse responses synthesized with Gaussian white noise. In an attempt to demonstrate the quantification capability of the SFDC, a systematic investigation was conducted whereby varied room configurations using carefully designed scattered interior surfaces were examined with the hypothesis that varied degrees of surface scattering will ultimately lead to varied degrees of sound field diffusion inside two, full scale, rooms. To this end, each room´s floor was covered with different configurations ranging from no diffusers to 16.74 m2  of diffusely reflecting surfaces, in 3 steps. This paper discusses the experimental design and evaluates the results of data collected using systematic modifications of varied degrees of surface scattering, each with combinations of different source orientations and microphone positions.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=19304

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