Abstract
Previous experiments on infinite peak clipping, using whole-word intelligibility as criterion, have shown that speech may retain high intelligibility when relative amplitude information in the waveform is eliminated. To determine whether this effect holds true for all speech sounds or whether individual phonemes are affected to a different degree, in the present experiment 10 listeners phonetically transcribed infinite-peak-clipped nonsense words tape recorded by three talkers. The test materials were based upon a corpus of six plosive and six fricative consonants, voiced and voiceless, combined with five vowels in VCV utterances. Eight syllable types containing the twelve consonants provided a controlled context with equal response alternatives for each stimulus. A differential effect of clipping was evident: dental fricatives were severely degraded in intelligibility, while plosives and alveolar fricatives tended to remain relatively unaffected. Intelligibility of voiced versus voiceless sounds was not differentially affected by clipping. Confusion matrices revealed that most errors occurred within the same voicing or manner-of-articulation category.
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