© 1987

Phonological Parsing in Speech Recognition


Table of contents

  1. Front Matter
    Pages i-xvii
  2. Kenneth W. Church
    Pages 1-40
  3. Kenneth W. Church
    Pages 41-63
  4. Kenneth W. Church
    Pages 65-82
  5. Kenneth W. Church
    Pages 83-95
  6. Kenneth W. Church
    Pages 97-118
  7. Kenneth W. Church
    Pages 119-131
  8. Kenneth W. Church
    Pages 133-154
  9. Kenneth W. Church
    Pages 155-178
  10. Kenneth W. Church
    Pages 179-188
  11. Back Matter
    Pages 189-261

About this book


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].


Allophon Klang Parsing Phonem cognition phonetic transcription speech recognition transcription

Authors and affiliations

  1. 1.Massachusetts Institute of TechnologyBostonUSA

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