Bech S
Department of Acoustic Technology, Technical University of Denmark, Lyngby, Denmark.
J Acoust Soc Am. 1998 Jan;103(1):434-45. doi: 10.1121/1.421098.
This paper reports on the influence of individual reflections on the auditory spatial aspects of reproduced sound. The sound field produced by a single loudspeaker positioned in a normal listening room has been simulated using an electroacoustical synthesis of the direct sound, 17 individual reflections and the reverberant field. The threshold of detection was measured using the method of adjustment for five reflections using three subjects for noise and speech. The thresholds have been measured for two simulated situations (1) a loudspeaker with a frequency independent directivity characteristics and frequency independent absorption coefficients of the room surfaces and (2) a loudspeaker with directivity similar to a standard two-way system and absorption coefficients according to measurements of real materials. The results have shown that subjects can reliably distinguish between timbre and spatial aspect of the sound field, that the spectral energy above 2 kHz of the individual reflection determines the importance of the reflection for the spatial aspects, and that only the first order floor reflection will contribute to the spatial aspects.
本文报道了个体反射对重放声音听觉空间方面的影响。通过对直达声、17个个体反射和混响场进行电声合成，模拟了放置在普通听音室中的单个扬声器产生的声场。使用调整法，让三名受试者对噪声和语音的五次反射测量检测阈值。针对两种模拟情况测量了阈值：（1）具有与频率无关的指向性特性以及房间表面与频率无关的吸收系数的扬声器；（2）具有类似于标准双向系统的指向性以及根据真实材料测量所得吸收系数的扬声器。结果表明，受试者能够可靠地区分声场的音色和空间方面，个体反射在2kHz以上的频谱能量决定了该反射对空间方面的重要性，并且只有一阶地面反射会对空间方面产生影响。
