It is well-known that phonemes have different acoustic realizations depending on the context. Thus, for example, the phoneme /t! is typically realized with a heavily aspirated strong burst at the beginning of a syllable as in the word Tom, but without a burst at the end of a syllable in a word like...

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1. Verfasser:	Church, Kenneth W. (VerfasserIn)
Format:	Elektronisch E-Book
Sprache:	English
Veröffentlicht:	Boston, MA Springer US 1987
Schriftenreihe:	The Kluwer International Series in Engineering and Computer Science, VLSI, Computer Architecture and Digital Signal Processing 38
Schlagworte:	Engineering Signal, Image and Speech Processing Phonology Artificial Intelligence (incl. Robotics) Computational Linguistics Artificial intelligence Computational linguistics Automatische Spracherkennung Phonetik Silbe
Online-Zugang:	BTU01 Volltext
Zusammenfassung:	It is well-known that phonemes have different acoustic realizations depending on the context. Thus, for example, the phoneme /t! is typically realized with a heavily aspirated strong burst at the beginning of a syllable as in the word Tom, but without a burst at the end of a syllable in a word like cat. Variation such as this is often considered to be problematic for speech recogni­ tion: (1) "In most systems for sentence recognition, such modifications must be viewed as a kind of 'noise' that makes it more difficult to hypothesize lexical candidates given an in­ put phonetic transcription. To see that this must be the case, we note that each phonological rule [in a certain example] results in irreversible ambiguity-the phonological rule does not have a unique inverse that could be used to recover the underlying phonemic representation for a lexical item. For example, . . . schwa vowels could be the first vowel in a word like 'about' or the surface realization of almost any English vowel appearing in a sufficiently destressed word. The tongue flap [(] could have come from a /t! or a /d/. " [65, pp. 548-549] This view of allophonic variation is representative of much of the speech recognition literature, especially during the late 1970's. One can find similar statements by Cole and Jakimik [22] and by Jelinek [50]
Beschreibung:	1 Online-Ressource (272 p)
ISBN:	9781461320135
DOI:	10.1007/978-1-4613-2013-5