Data processing: speech signal processing – linguistics – language – Speech signal processing – Recognition
Patent
1995-10-26
1998-04-21
MacDonald, Allen R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
Recognition
704225, 704226, 704233, 704256, G10L 906
Patent
active
057429286
ABSTRACT:
A speech recognition apparatus recognizes utterances of unnatural speech having a higher performance of recognition accuracy with a smaller amount of speech learning data. The speech recognition apparatus includes an acoustic-phonetic variability learn unit, a normal speech model memory, a spectrum smooth-modifier and a speech recognizer. An input speech signal is acoustically analyzed and transformed into a time-series feature vector. The acoustic-phonetic variability learn unit learns an acoustic-phonetic change of spectrum caused by unnatural speech and generates a plurality of acoustic-phonetic variability models. The normal speech model memory stores a normal speech model learned based on normal speech data. The spectrum smooth-modifier modifies the normal speech model based on a plurality of the acoustic-phonetic variability model and generates a plurality of spectrum-modified speech models. The speech recognizer recognizes the time-series feature vector based on the normal speech model and the spectrum-modified speech model.
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Junqua, J. "The Influence of Psychoacoustic and Psycholinguistic factors on Listner Judgments of Intelligibility of Normal and Lombard Speech." ICASSP '91: Acoustics, Speech & Signal Processing Conference, 1991.
Hanson, B. et al. "Robust Speaker-Independent Word Recognition Using Static, Dynamic Acceleration Features: Experiments with Lombard and Noisy Speech." ICASSP '90: Acoustics, Speech & Signal Processing Conference, 1990.
ICSLP 94 "Isolated Word Recognition Using Models for Acoustic Phonetic Variability by Lombard Effect" Suzuki, Nakajima & Abe, Computer & Information Systems Lab., Mitsubishi Electric -Japan.
Collins Alphonso A.
MacDonald Allen R.
Mitsubishi Denki & Kabushiki Kaisha
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