Florentine M, Buus S
Department of Speech-Language Pathology and Audiology (133FR), Northeastern University, Boston, Massachusetts 02115, USA.
J Acoust Soc Am. 1995 Apr;97(4):2460-7. doi: 10.1121/1.413099.
Two experiments examined how level discrimination (also called intensity discrimination) between two successive three-tone complexes depends on the bandwidth and rove range of a notched-noise masker. The three-tone complex consisted of equally intense components at 0.84, 1, and 1.17 kHz set to 25, 55, or 85 dB SPL. The notch extended from 0.77 to 1.27 kHz for all masker bandwidths. The masker level changed randomly on each presentation to reduce profile cues. Results from five listeners showed that level-discrimination thresholds, delta L's (= 20 log([p + delta p]/p), where p is pressure), increased somewhat as the rove range increased. In contrast to profile-discrimination experiments, the delta L's did not decrease with increasing masker bandwidth. In addition, when the rove range was 10 dB or larger, discrimination was generally better than the best possible performance by a profile observer. The results indicate that profile analysis is not essential for reasonably good level discrimination in the presence of notched-noise maskers.
两项实验研究了两个连续的三音复合体之间的电平辨别（也称为强度辨别）如何取决于带凹口噪声掩蔽器的带宽和游动范围。三音复合体由0.84、1和1.17千赫兹处强度相等的成分组成，设置为25、55或85分贝声压级。对于所有掩蔽器带宽，凹口从0.77千赫兹延伸到1.27千赫兹。每次呈现时掩蔽器电平随机变化，以减少轮廓线索。五位听众的结果表明，电平辨别阈值ΔL（=20log([p + Δp]/p)，其中p为声压）随着游动范围的增加而有所增加。与轮廓辨别实验不同，ΔL并没有随着掩蔽器带宽的增加而降低。此外，当游动范围为10分贝或更大时，辨别通常优于轮廓观察者的最佳可能表现。结果表明，在存在带凹口噪声掩蔽器的情况下，轮廓分析对于相当好的电平辨别并非必不可少。
