| Main obstacles in Speech recognition |
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| F | Linguistic
Variability: Phonetic, Phonology, |
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| Syntax,
Semantics, Discourse |
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| F | User V. :
Tempo, Pronunciation, Inflexion, |
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| Fatigue, stress,
coarseness... |
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| F | Channel
Variability: Noise, transmission channel |
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| F | Coarticulation:
Phonemes context |
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