Abstract
This study aimed to evaluate the relative importance of temporal fine structure (TFS) and spectral resolution on speech masking release. Speech perception abilities were measured with amplitude modulated noise and steady noise maskers in normal-hearing subjects. A vocoder processing technique was developed to systematically vary the amount of TFS delivered in stimuli: 0%, 50%, 75%, and 100% of TFS were presented. Spectral resolution was controlled by varying the number of vocoder channels: 8- and 32-channels were tested. Both TFS and spectral resolution were found to significantly contribute to speech perception in the two maskers. The addition of TFS information increased the speech masking release for 8- and 32-channel conditions, but the improvement was significantly greater for 8-channel condition. The results support the hypothesis that the effect of TFS on speech masking release will be greater when spectral resolution is limited. [Work supported by NIH Grants No. R01-DC007525 and T32-DC000033.]
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