Department of Experimental Audiology, Otto-von-Guericke University, Leipziger Strasse 44, D-39120 Magdeburg, Germany.
J Acoust Soc Am. 2011 Dec;130(6):3905-15. doi: 10.1121/1.3652866.
The level of broadband signals is usually lower than that of equally loud narrow-band signals. This effect, referred to as spectral loudness summation, is commonly measured for broadband signals where all frequency components are presented simultaneously. The present study investigated to what extent spectral loudness summation also occurs for nonsimultaneously presented frequency components. Spectral loudness summation was measured in normal-hearing listeners with an adaptive forced-choice procedure for sequences of short tone pulses with varying frequencies, randomly chosen from a set of five frequencies. In addition, spectral loudness summation was measured for the simultaneous presentation of all five frequencies. The comparison stimulus consisted of tone pulses with the same frequency for all tone pulses of the sequence and the same repetition rate and overall duration as the test signal. The pulse duration was 10, 20, 50, or 100 ms and the inter-pulse interval ranged from 0 to 390 ms. In general, a considerable nonsimultaneous spectral loudness summation was found for short pulse durations and inter-pulse intervals, but a residual effect was also observed for the largest inter-pulse interval. The data are discussed in the light of repetition-rate dependent spectral loudness summation and effects of persistence of specific loudness after tone-pulse offset.
宽带信号的强度通常低于同等响度的窄带信号。这种效应被称为频谱响度总和，通常用于同时呈现所有频率分量的宽带信号。本研究探讨了非同时呈现的频率分量是否也会出现频谱响度总和。正常听力受试者通过自适应强制选择程序，对短音脉冲序列进行了测量，这些短音脉冲的频率在一组五个频率中随机选择。此外，还同时测量了所有五个频率的频谱响度总和。比较刺激由具有相同频率的音脉冲组成，序列中的所有音脉冲的频率相同，重复率和总持续时间与测试信号相同。脉冲持续时间为 10、20、50 或 100 毫秒，脉冲间隔范围为 0 至 390 毫秒。一般来说，对于短脉冲持续时间和脉冲间隔，会发现相当大的非同时频谱响度总和，但对于最大的脉冲间隔，也观察到了残留效应。这些数据根据重复率相关的频谱响度总和以及音脉冲结束后特定响度的持久性效应进行了讨论。
