Takeuchi A H, Braida L D
Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge 02139, USA.
J Acoust Soc Am. 1995 Jul;98(1):142-7. doi: 10.1121/1.413750.
Listeners indicated which of two comparisons had the same pattern of amplitude modulation as a target signal when distractors were presented simultaneously with the comparisons. The frequency separation between distractors and comparisons was either narrow or wide. Distractors were either modulated independently of the comparisons, comodulated with the comparisons, or unmodulated. At wide frequency separations, none of the distractors interfered significantly with modulation comparison, relative to performance with no distractors. At narrow frequency separations, comodulated distractors produced less interference than did independently modulated distractors. Unmodulated distractors also produced some interference. There was no difference between diotic presentation and dichotic presentation, in which distractors were presented to the opposite ear from targets and comparisons. Implications for the presentation of multiple envelope signals derived from different spectral regions of a speech signal to convey speech to hearing-impaired listeners are discussed.
当干扰信号与比较信号同时呈现时，听众需指出两个比较信号中哪一个具有与目标信号相同的幅度调制模式。干扰信号与比较信号之间的频率间隔要么窄要么宽。干扰信号要么与比较信号独立调制，要么与比较信号共同调制，要么未调制。在宽频率间隔下，相对于无干扰信号时的表现，没有一个干扰信号会对调制比较产生显著干扰。在窄频率间隔下，共同调制的干扰信号产生的干扰比独立调制的干扰信号少。未调制的干扰信号也会产生一些干扰。双耳呈现和对侧耳呈现（即干扰信号呈现给与目标和比较信号相对的耳朵）之间没有差异。文中讨论了从语音信号的不同频谱区域导出多个包络信号以向听力受损听众传达语音的呈现方式的相关影响。
