G - Physics – 10 – L
Patent
G - Physics
10
L
354/50
G10L 11/02 (2006.01)
Patent
CA 1218458
Abstract of the Disclosure An apparatus and method for automatic detection of speech signals in the presence of noise including noise events occurring when speech is not present and having signals whose signal strengths are substantially equal to or greater than the speech signals. Frames of data representing digitized output signals fromn a plurality of frequency filters are operated on by a linear feature vector to create a scalar feature for each frame which is indicative of whether the frame is to be associated with speech signals or noise event signals. The scalar features are compared with a detection threshold value which is created and updated from a plurality of previously stored scalar features. A plurality of the results of the comparison for a succession of frames is stored and the stored results combined in a predetermined way to obtain an indication of when speech signals are present. In automatic speech recognizers employing the above-described speech detections, when such indication is- given, frames are further preprocessed and then compared with stored templates in accordance with the dynamic programming algorithm in order to recognize which word was spoken.
458275
Boll Steven F.
Carlin Lawrence
Hutchins Sandra E.
Smith Allen R.
Vensko George
International Standard Electric Corporation
Smart & Biggar
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