Spatial Impulse Response Rendering II: Reproduction of Diffuse Sound and Listening Tests
Spatial impulse response rendering (SIRR) is a method for reproducing room impulse responses over multichannel loudspeaker setups. The applied analysis and synthesis methods were introduced in a companion paper. Time–frequency analysis is used to obtain directional and diffuseness information from the recorded sound field. Nondiffuse sound is then reproduced as pointlike virtual sources, and diffuse sound is synthesized with a decorrelation technique. The proposed synthesis methods for diffuse sound are examined in more detail and a hybrid method is derived. The relationship between diffuseness and interaural coherence is also studied. In addition, results of two listening tests are presented. It is shown that with a large loudspeaker setup under anechoic conditions, SIRR reproduction is at best indistinguishable from the original sample. Furthermore, in a listening test conducted in a standard listening room with real measured responses, SIRR reproduction is evaluated as the most natural one of the systems studied.
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