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US 5,572,623 AGranted
Method of speech detection
AssigneeSextant Avionique
InventorDominique Pastor
Life of this patent
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Abstract
A method for detecting the start and end of speech from a noisy signal including the steps of: detecting a voiced frame; searching for noise frames preceding this voiced frame; constructing an autoregressive model of the noise and a mean noise spectrum; bleaching the flames preceding the voicing, searching for the actual start of speech in the bleached frames; removing the noise from the voiced frames and parameterizing them; and searching for the actual end of speech.
Claims11
A method of detecting speech in noisy signals, comprising the steps of:
- sampling plural speech frames including plural noise frames, at least one voiced frame and additional plural noise frames after said at least one voiced frame;
- identifying said at least one voiced frame;
- identifying said plural noise frames preceding said at least one voiced frame;
- constructing an autoregressive model of noise and a mean noise spectrum based on said plural noise frames preceding said at least one voiced frame;
- bleaching said plural noise frames preceding said at least one voiced frame by using a rejector filter;
- removing noise by spectral noise removal from said plural noise frames preceding said at least one voiced frame;
- finding an actual start of speech in the bleached plural noise frames;
- extracting acoustic vectors used by a voice recognition system from the plural noise-removed frames lying between the actual start of speech and a first of said at least one voiced frame;
- removing noise from and parameterizing said at least one voiced frame;
- finding an actual end of speech;
- and
- removing noise and parameterizing frames lying between a last of said at least one voiced frame and the actual end of speech.
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