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Impression evaluation of mixed acoustic signals with different spatial acoustic characteristics

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Tele-ensemble systems have been widely used and mixed acoustic signals with different spatial acoustic characteristics for each space are heard. However, the perceptual impression of mixed acoustic signals containing multiple different spatial acoustic characteristics has not been sufficiently investigated. In this study, a listening test was performed to survey the difference of impression regarding the mixed acoustic signals with single and different spatial acoustic characteristics. Three instrumental signals (guitar, bass and drums) were played with a loudspeaker and recorded in three rooms. For the listening test, four mixed acoustic signals were set: No.1 All instruments were captured in the low reverberation room. No.2 All instruments were captured in the medium reverberation room. No.3 All instruments were captured in the high reverberation room. No.4 Bass was captured in the low reverberation room, drum in the medium reverberation room and guitar in the high reverberation room. Participants listened to No. 4 and compared it with Nos. 1, 2, and 3 and selected one of the seven evaluation items (pleasant, natural, reverberant, coherent, clear, likeable, noisy). Participants perceived No.1 as a pleasant acoustic signal with little reverberation and Nos.2 and 3 as unpleasant acoustic signals with more reverberation compared to No.4. It is suggested that mixed acoustic signals recorded in the low reverberation room are considered the least reverberant and the most comfortable. These results lead us to the conclusion that the homogenization of spatial acoustic characteristics by suppressing reverberation from the acoustic signals captured in multiple spaces is considered to be one method to give a pleasant impression.

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