Bech S
Acoustics Laboratory, Technical University of Denmark, Lyngby.
J Acoust Soc Am. 1995 Mar;97(3):1717-26. doi: 10.1121/1.413047.
This paper reports some of the influences of individual reflections on the timbre of reproduced sound. A single loudspeaker with frequency-independent directivity characteristics, positioned in a listening room of normal size with frequency-independent absorption coefficients of the room surfaces, has been simulated using an electroacoustic setup. The model included the direct sound, 17 individual reflections, and the reverberant field. The threshold of detection and just-noticeable differences for an increase in level were measured for individual reflections using eight subjects for noise and speech. The results have shown that the first-order floor and ceiling reflections are likely to individually contribute to the timbre of reproduced speech. For a noise signal, additional reflections from the left sidewall will contribute individually. The level of the reverberant field has been found to have an effect on the contribution of the individual reflections. An increase in the level of individual reflections are most likely to be audible for the first-order floor and ceiling reflections, and certain reflections from the sidewalls.
本文报道了个体反射对重放声音音色的一些影响。使用电声装置模拟了一个具有与频率无关的指向性特性的单个扬声器，该扬声器放置在一个房间表面吸声系数与频率无关的正常大小的听音室中。该模型包括直达声、17个个体反射和混响场。使用8名受试者针对噪声和语音测量了个体反射的检测阈值和电平增加时的刚可察觉差异。结果表明，一阶地面和天花板反射可能会分别对重放语音的音色产生影响。对于噪声信号，来自左侧墙壁的额外反射会分别产生影响。已发现混响场的电平会对个体反射的影响产生作用。个体反射电平的增加最有可能在一阶地面和天花板反射以及来自侧壁的某些反射中被听到。
