Summary: PROOF COPY 027602JAS
On the perception of voicing in syllable-initial plosives in noisea)
Marcia Chen, and Abeer Alwanc
Department of Electrical Engineering, University of California, Los Angeles, California 90095
Received 16 November 2004; revised 10 November 2005; accepted 15 November 2005
Previous studies Lisker, J. Acoust. Soc. Am. 57, 15471551 1975 ; Summerfield and Haggard, J.
Acoust. Soc. Am. 62, 435448 1977 have shown that voice onset time VOT and the onset
frequency of the first formant are important perceptual cues of voicing in syllable-initial plosives.
Most prior work, however, has focused on speech perception in quiet environments. The present
study seeks to determine which cues are important for the perception of voicing in syllable-initial
plosives in the presence of noise. Perceptual experiments were conducted using stimuli consisting
of naturally spoken consonant-vowel syllables by four talkers in various levels of additive white
Gaussian noise. Plosives sharing the same place of articulation and vowel context e.g., /pa,ba/
were presented to subjects in two alternate forced choice identification tasks, and a threshold
signal-to-noise-ratio SNR value corresponding to the 79% correct classification score was
estimated for each voiced/voiceless pair. The threshold SNR values were then correlated with