Bioengineering Research Group, Department of Electrical, Electronic and Computer Engineering, University of Pretoria, Hatfield, 0020, South Africa.
J Acoust Soc Am. 2013 Sep;134(3):2256-67. doi: 10.1121/1.4817877.
Stimuli used in timbre perception studies must be controlled carefully in order to yield meaningful results. During psychoacoustic testing of individual timbre properties, (1) it must be ensured that timbre properties do not co-vary, as timbre properties are often not independent from one another, and (2) the potential influence of loudness, pitch, and perceived duration must be eliminated. A mathematical additive synthesis method is proposed which allows complete control over two spectral parameters, the spectral centroid (corresponding to brightness) and irregularity, and two temporal parameters, log rise-time (LRT) and a parameter characterizing the sustain/decay segment, while controlling for covariation in the spectral centroid and irregularity. Thirteen musical instrument sounds were synthesized. Perceptual data from six listeners indicate that variation in the four timbre properties mainly influences loudness and that perceived duration and pitch are not influenced significantly for the stimuli of longer duration (2 s) used here. Trends across instruments were found to be similar.
为了得出有意义的结果，用于音色感知研究的刺激物必须经过精心控制。在对个别音色属性进行心理声学测试时，（1）必须确保音色属性不会共同变化，因为音色属性通常彼此不独立，并且（2）必须消除响度、音高和感知持续时间的潜在影响。提出了一种数学加法合成方法，该方法允许完全控制两个光谱参数，即光谱质心（对应于亮度）和不规则性，以及两个时间参数，对数上升时间（LRT）和一个表征维持/衰减段的参数，同时控制光谱质心和不规则性的共变。合成了 13 种乐器声音。来自 6 位听众的感知数据表明，四个音色属性的变化主要影响响度，并且对于这里使用的较长持续时间（2 秒）的刺激，感知持续时间和音高没有受到显著影响。发现乐器之间的趋势相似。
