Data processing: speech signal processing – linguistics – language – Speech signal processing – Recognition
Patent
1996-03-08
1998-05-05
MacDonald, Allen R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
Recognition
704219, G10L 302, G10L 900
Patent
active
057490678
ABSTRACT:
Speech is distinguished from noise by a spectral comparison of an input signal with a stored noise estimate. Updating of the noise estimate stored in a buffer is permitted during periods when speech is absent under control of an auxiliary detector. In order to improve operation in the presence of signals with strong harmonic components, e.g., signalling tones, an LPC prediction gain is computed from the input (x(i)) and a residual (y(i)) obtained from the input following filtering by a filter having a response complementary to the frequency spectrum of the input, and if the gain exceeds a threshold, buffer updating is suppressed.
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British Telecommunications public limited company
Edouard Patrick N.
MacDonald Allen R.
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