LAUSR

A dodecahedral loudspeaker is commonly used in room acoustical measurements as an omnidirectional sound source. However, inverse filtering to obtain an ideal room impulse response (RIR) is not easy because of its irregular frequency and temporal characteristics. When this RIR is convolved with music signals, the reproduced sound does not possess adequate fidelity to evaluate the acoustical quality of the concert hall. Hence a new measurement method of the RIR by an omnidirectional source is proposed: RIR’s are measured by a small bookshelf loudspeaker rotating around its acoustic center in multiple directions, and the RIR’s are averaged to obtain omnidirectional response. Physical characteristics of the RIR determined with this procedure are given and the room acoustical parameters are compared with those by the dodecahedral method. Finally, application to subjective experiments is described.