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• W2009562705 abstract "Identification experiments were performed to assess the relative importance of Fourier phase versus amplitude for intervocalic stop consonant perception. In the first experiment, three types of stimuli were constructed from VCV signals: (1) Swapped stimuli, a swapped stimulus has the amplitude spectra of its consisting segments from one VCV signal and its corresponding phase spectra from another; (2) Phase-only stimuli; and (3) Amplitude-only stimuli. It was shown that the perception of intervocalic stop consonants varies from amplitude dominance to phase dominance as the Fourier analysis window size increases. The crossover lies somewhere between 192 ms and 256 ms. The influence of phase at smaller window sizes was elaborated in the second experiment. This experiment demonstrated that phonetically different signals can be constructed by combining the same short-time amplitude spectra with different phase spectra, so the short-time amplitude spectra displayed on a spectrogram cannot exclusively specify a stop consonant. In both experiments, the perception of voicing in stops was found to rely strongly on phase information while the perception of the place of articulation was mainly determined by amplitude information. Innerhalb einer Reihe Identifikationsexperimenten wurden die Einflüsse von Phase bzw. Amplitude auf die Wahrnehmung von zwischenvokalischen Plosivlauten untersucht. Für das erste Experiment wurden aus den VCV-Äußerungen drei Typen von Stimuli erzeugt: (1) “Swapped” Stimuli: ein derartiger Reiz besitzt das Amplitudenspektrum einer VCV-Äußerung und das Phasenspektrum einer anderen VCV-Äußerung; (2) “Phase-only” Stimuli; und (3) “Amplitude-only” Stimuli. Die Experimente zeigen, daß die Identifikation des zwischenvokalischen Plosivlauten sich verändert von Amplitudendominanz zu Phasendominanz in dem Maße wie die Zeitbasis für die Fourieranalyse zunimmt. Der Kreuzungspunkt zwischen Amplituden- und Phasendominanz liegt bei Zeitfenstern im Bereich zwischen 192 ms und 256 ms. Das zweite Experiment untersuchte den Phaseneinfluß bei sehr kleinen Zeitfenstern. Dieses Experiment zeigte, daß aus dem gleichen Amplitudenspektrum, jedoch unterschiedlichen Phasenspektra, unterschiedliche Phoneme konstruiert werden können, so daß das Kurzzeit-Amplitudenspektrum eines Sprachsignals, das Spektrogramm, nicht immer die Identifikation eines Phones erlaubt. Beide Experimente ergaben, daß das Erkennen der Stimmhaftigkeit von Plosiven stärker auf der Phaseninformation, das Erkennen des Artikulationsortes stärker auf der Amplitudeninformation zu beruhen scheint. Dans une série d'expériences d'identification, les effets de phase et d'amplitude sur la perception de consonnes plosives en environnement vocalique ont été étudiés. Pour la première expérience ont été produits, à partir de stimuli VCV (voyelle, consonne, voyelle), trois types de stimuli: (1) les “Swapped” stimuli, qui ont le spectre d'amplitude d'un signal VCV et le spectre de phase d'un autre signal VCV; (2) les “Phase-only” stimuli; (3) les “Amplitude-only” stimuli. Les expériences révèlent que la perception de consonnes plosives, en environnement vocalique, passe de la dominance d'amplitude à la dominance de la phase quand la taille de la fenêtre de l'analyse Fourier croı̂t. Le passage de l'une à l'autre apparait pour des longueurs de fenêtres situées entre 192 ms et 256 ms. Dans la deuxième expérience, on a examiné l'effet de phase pour des tailles de fenêtre plus petites. Cette expérience montre qu'à partir d'un même spectre d'amplitude, mais avec spectres de phase différents, on peut construire différents sons. Donc le spectre d'amplitude obtenu avec une fenêtre d'analyse très petite ne permet pas toujours l'identification d'une consonne plosive. Selon les deux expériences, la perception d'une plosive sonore semble dépendre fortement de l'information de phase, celle du lieu d'articulation semble dépendre surtout de l'information d'amplitude." @default.
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• W2009562705 date "1997-09-01" @default.
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• W2009562705 title "Effects of phase on the perception of intervocalic stop consonants" @default.
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