A technique for spatial reproduction of room acoustics, Spatial Impulse Response Rendering (SIRR), has been recently proposed. In the method, a multi-channel impulse response of a room is measured, and responses for loudspeakers in an arbitrary multi-channel listening setup are computed. When the responses are loaded to a convolving reverberator, they will create a perception of space corresponding to the measured room. The method is based on measuring with a SoundField microphone or a comparable system, and on analyzing direction-of-arrival and diffuseness at frequency bands. An omnidirectional response is then positioned to a loudspeaker system according to analyzed directions and diffuseness. In this paper, the SIRR method is reviewed and refined. The reproduction quality of SIRR and some other systems is evaluated with listening tests, and it is found that SIRR yields a natural spatial reproduction of the acoustics of a measured room.
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