Abstract
The relation between the masking functions for white noise (WN) and speech-modulated noise (SMN) for vowels and words were compared. Three randomizations containing three examples of each of the nine pure vowels in an h_d context (27 vowels/list) and four CID, W-1, word lists served as stimuli. Two matched groups of 20 subjects heard the vowel and word lists at four (−12, −8, −4, 0) S/N ratios. The order of presentation of the lists and S/N ratios were randomized across subjects. One group heard the stimuli in the presence of WN, the other group in the presence of SMN. The SMN was generated in such a manner that the envelope of the masking noise for each stimulus closely approximated the envelope of that stimulus. Subject's performance was consistently better for the vowels than the W-1 words. However, performance on both words and vowels was consistently better under WN masking than under SMN masking. This finding is in direct opposition to previous authors.
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