Gain and noise matching for speech recognition

Abstract

A speech recognition system includes a token builder, a noise estimator, a template padder, a gain and noise adapter and a dynamic time warping (DTW) unit. The token builder produces a widened test token representing an input test utterance and at least one frame before and after the input test utterance. The noise estimator estimates noise qualities of the widened test token. The template padder pads each of a plurality of reference templates with at least one blank frame either the beginning or end of the reference template. The gain and noise adapter adapts each padded reference template with the noise and gain qualities thereby producing adapted reference templates having noise frames wherever a blank frame was originally placed and noise adapted speech where speech exists. The DTW unit performs a noise adapted DTW operation comparing the widened token with one of the noise adapted reference templates, wherein, when comparing against one of the noise frames, no duration constraints are used. The present invention includes the method performed by the system.

Dependencies are inferred from the claim text.