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We present a straightforward and robust algorithm for periodicity detection, working in the lag (autocorrelation) domain. When it is tested for periodic signals and for signals with additive noise or jitter, it proves to be several orders of magnitude more accurate than the methods commonly used for speech analysis. This makes our method capable of(More)
Variation is controlled by the grammar, though indirectly: it follows automatically from the robustness requirement of learning. If every constraint in an Optimality-Theoretic grammar has a ranking value along a continuous scale, and the disharmony of a constraint at evaluation time is randomly distributed about this value, the phenomenon of optionality in(More)
This paper examines four acoustic correlates of vowel identity in Brazilian Portuguese (BP) and European Portuguese (EP): first formant (F1), second formant (F2), duration, and fundamental frequency (F0). Both varieties of Portuguese display some cross-linguistically common phenomena: vowel-intrinsic duration, vowel-intrinsic pitch, gender-dependent size of(More)
Second-language (L2) speech perception research has identified several patterns in the non-native perception of vowel contrasts. The models that account for non-native perception (Perceptual Assimilation Model, Best 1995; and Speech Learning Model, Flege 1995; for a summary of these and other non-native perception models see introduction in Best, McRoberts(More)
A series of experiments shows that Spanish learners of English acquire the ship-sheep contrast in a way specific to their target dialect (Scottish or Southern British English) and that many learners exhibit a perceptual strategy found in neither Spanish nor English. To account for these facts as well as for the findings of earlier research on second(More)
We will show that the Gradual Constraint-Ranking Learning Algorithm is capable of modelling attested acquisition orders and learning curves in a realistic manner, thus bridging the gap that used to exist between formal computational learning algorithms and actual acquisition data. Levelt, Schiller, and Levelt (to appear) found that the acquisition order for(More)
by the author Variation, preferences, and subregularities can be derived from one and the same grammar if we assume that grammars are partial orderings of vio-lable constraints. This is the claim defended in this dissertation. The argument is based on detailed analyses of the Finnish nominal declension. 1. Free variation The Finnish genitive plural has(More)