Patent ID: 6804643
Filing Date: 2004-10-12
Classification: G10L

Abstract:
A speech recognition feature extractor for extracting speech features from a speech signal, comprising: a time-to-frequency domain transformer for generating spectral magnitude values in the frequency domain from the speech signal;a frequency domain filtering block for generating a sub-band value relating to spectral magnitude values of a certain frequency sub-band, for each of a group of frequency sub-bands; a compression block for compressing said sub-band values; a transformat on block for obtaining a set of de-correlated features from the sub-band values; and a normalising block for normalizing features; said feature extractor comprising a mean emphasising block for emphasizing at least one of the sub-band values after frequency domain filtering, wherein the emphasising is accomplished by addition of a mean value of sub-band signals to said at least one of the sub-band values.