US 5,710,864 A · Systems, methods and articles of manufacture for improving recognition confidence in hypothesized keywords

Abstract

Systems, methods and articles of manufacture are provided for adjusting the parameters of ones of a plurality of recognition models. The recognition models collectively represent a vocabulary. The recognition models are utilized to identify a known word represented within a received input signal. The received input signal may include within vocabulary and out of vocabulary words. An output signal representing a confidence measure corresponding to the relative accuracy of the identity of the known word is generated. Particular ones of the plurality of recognition models are adjusted as a function of the output signal to improve the confidence measure. The systems, methods and articles of manufacture are preferably implemented in accordance with discriminative techniques, and the adjustment process is used during either a preferred training or a recognition mode.

Claims30

Dependent claims

A speech recognition system comprising:

a memory for storing a plurality of recognition models wherein each one of said recognition models represents a known word within a vocabulary, said plurality of recognition models including keyword recognition models representing keywords and alternate hypothesis recognition models representing words phonetically similar to the keywords;
and
a processor having an input for receiving an input signal representing a speech utterance, the processor processing said input signal utilizing ones of said plurality of recognition models to identify a particular known word represented within said input signal, generating an output signal representing a confidence measure corresponding to the relative accuracy of the identity of said particular known word, and adjusting at least one of said alternate hypothesis recognition models as a function of said output signal to improve said confidence measure.

A storage medium for storing a plurality of processing system instructions, said plurality of processing system instructions capable of being read and executed by one or more processing units for performing speech recognition, said memory storage device including:

a first instruction set for storing a plurality of recognition models wherein each one of said recognition models represents a different known word within a vocabulary, said plurality of recognition models including keyword recognition models representing keywords and alternate hypothesis recognition models representing words phonetically similar to the keywords;
a second instruction set for storing a received input signal representing a speech utterance;
a third instruction set for utilizing ones of said plurality of recognition models to identify a particular known word represented within said input signal, generating an output signal representing a confidence measure corresponding to the relative accuracy of the identity of said particular known word, and adjusting at least one of said alternate hypothesis recognition models as a function of said output signal to improve said confidence measure.

Dependencies are inferred from the claim text.

Systems, methods and articles of manufacture for improving recognition confidence in hypothesized keywords

Life of this patent

Systems, methods and articles of manufacture for improving recognition confidence in hypothesized keywords

Life of this patent

Abstract

Claims30