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Prosodic Effects on Lenis/Fortis Perception: Preplosive F₀ and LPC Synthesis

Abstract Two experiments, each with three sub-tests, examine the influences on lenis/ fortis perception of both preplosive F₀ (flat vs. rising) in monotone utterance intonation and of natural vs. synthetic speech quality. The German word ‘leiten’ [laetn], ‘to lead’, pronounced by a male and a female speaker [Experiments I and II, respectively), formed the basis for the test stimulus construction. The stop closure (= silence) was varied by the same 5 steps to yield a continuum from clear /t/ to clear /d/ in all tests. The data support the conclusion that a rising as opposed to a non-rising F₀ at the end of a preplosive vowel in a monotone utterance intonation increases /t/ perception. They also show that LPC synthesis quality is a strong additional cue for /t/, being stronger where it characterizes the whole utterance rather than only a small part of it. These influences on lenis/fortis perception are found to be consistent for the male and the female voice.