Methods and apparatus for generating and using speaker independent garbage models for speaker dependent speech recognition purpose
First Claim
1. A speech recognition method, comprising the steps of:
- performing a speaker independent speech recognition operation on a signal using a first set of speaker independent speech recognition models corresponding to a first set of words;
performing a speaker dependent speech recognition operation on said signal using a set of speaker dependent speech recognition models corresponding to a second set of words and using, as an out of vocabulary word model, at least one speaker independent speech recognition model corresponding to a word included in the first set of words.
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Abstract
Methods and apparatus for generating and using both speaker dependent and speaker independent garbage models in speaker dependent speech recognition applications are described. The present invention recognizes that in some speech recognition systems, e.g., systems where multiple speech recognition operations are performed on the same signal, it may be desirable to recognize and treat words or phrases in one part of the speech recognition system as garbage or out of vocabulary utterances with the understanding that the very same words or phrases will be recognized and treated as in-vocabulary by another portion of the system. In accordance with the present invention, in systems where both speaker independent and speaker dependent speech recognition operations are performed independently, e.g., in parallel, one or more speaker independent models of words or phrases which are to be recognized by the speaker independent speech recognizer are included as garbage (OOV) models in the speaker dependent speech recognizer. This reduces the risk of obtaining conflicting speech recognition results from the speaker independent and speaker dependent speech recognition circuits. The present invention also provides for the generation of speaker dependent garbage models from the very same data used to generate speaker dependent speech recognition models, e.g., word models. The technique involves processing the data included in the speaker dependent speech recognition models to create one or more speaker dependent garbage models.
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16 Claims
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1. A speech recognition method, comprising the steps of:
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performing a speaker independent speech recognition operation on a signal using a first set of speaker independent speech recognition models corresponding to a first set of words; performing a speaker dependent speech recognition operation on said signal using a set of speaker dependent speech recognition models corresponding to a second set of words and using, as an out of vocabulary word model, at least one speaker independent speech recognition model corresponding to a word included in the first set of words. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A speech recognition method, comprising the steps of:
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performing a speaker independent speech recognition operation on a signal to identify words or phrases included therein using a first set of speaker independent speech recognition models corresponding to a first set of words or phrases; performing a speaker dependent speech recognition operation on the signal to identify words or phrases included therein using as garbage models a second set of speaker independent speech recognition models corresponding to the words or phrases included in the first set of words or phrases and using a set of speaker dependent speech recognition models to identify words or phrases included in the signal corresponding to a second set of words or phrases, the speaker dependent speech recognition operation including the step of rejecting words or phases identified using the second set of speaker independent speech recognition models as being out of vocabulary words or phrases. - View Dependent Claims (8, 9, 10, 11)
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12. A speech recognition system, comprising:
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speaker independent means for identifying a first set of words in a signal by performing a speaker independent speech recognition operation on the signal; speaker dependent means for identifying a second set of words in the signal by performing a speaker dependent speech recognition operation on the signal, the speaker dependent means including speaker independent means for identifying and rejecting a word included in the first set of words. - View Dependent Claims (13, 14, 15, 16)
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Specification