Dreyer Anna A, Oxenham Andrew J
Harvard University/MIT Division of Health Sciences and Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
J Acoust Soc Am. 2008 Jan;123(1):EL1-7. doi: 10.1121/1.2820442.
Just-noticeable interaural time differences were measured for low-frequency pure tones, high-frequency sinusoidally amplitude-modulated (SAM) tones, and high-frequency transposed stimuli, at multiple levels with or without a spectrally notched diotic noise to prevent spread of excitation. Performance with transposed stimuli and pure tones was similar in quiet; however, in noise, performance was poorer for transposed stimuli than for pure tones. Performance with SAM tones was always poorest. In all conditions, performance improved slightly with increasing level. The results suggest that the equivalence postulated between transposed stimuli and pure tones is not valid in the presence of a spectrally notched background noise.
在有或没有频谱带凹口的双耳噪声以防止兴奋扩散的情况下，针对低频纯音、高频正弦调幅（SAM）音以及高频移调刺激，在多个声级下测量了刚好可察觉的双耳时间差。在安静环境中，移调刺激和纯音的表现相似；然而，在噪声环境中，移调刺激的表现比纯音差。SAM音的表现总是最差的。在所有条件下，随着声级增加，表现略有改善。结果表明，在存在频谱带凹口背景噪声的情况下，移调刺激和纯音之间假定的等效性并不成立。
