Abstract
Temporal effects of 50-msec wideband and narrow-band noise bursts on the perception of three voiceless stop consonants in CV syllables, /pa/, /ta/, /pu/, /tu/, and /ku/, were investigated. In each trial a single noise burst was presented in a specified temporal relation with a syllable. The time intervals between the beginning of the syllable and the end of the noise burst were studied in a range between −600 msec (burst before the syllable) and +150 msec (burst completely within the syllable). The listening tests were conducted at 88 and 96 dB noise burst SPL and seven S/N ratios ranging between −22 and −50 dB. The results demonstrated appreciable masking within ±150-msec interval. Maximum masking occurred when the noise burst overlapped a part of the frictional noise of the stop consonant. Forward masking, measured as decrease in intelligibility, decreased linearly as the logarithmetic function of interval. Consistent relations were found between the noise spectra and the amount of masking and the type of substitution errors. Differences as a function of talkers and vowels were also observed.
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