User selectable multiple threshold criteria for voice recognition
First Claim
1. A speech recognizer apparatus for recognizing a phrase including at least one word, based upon an utterance, the apparatus comprising:
- a plurality of stored recognition criteria sets, each stored recognition criteria set having at least one class of recognition criteria, each stored class being associated with a corresponding probability of recognition for a given utterance;
a selection module responsive to a user, wherein said user selects a selected recognition criteria set from said plurality of stored recognition criteria sets;
a comparator module, responsive to the selection module, for determining whether a similarity metric corresponding to a most closely matching model of speech satisfies the selected recognition criteria set; and
a recognizer module for recognizing the utterance as the phrase corresponding to said most closely matching model of speech when the selected recognition criteria set is satisfied.
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Abstract
A method and apparatus for speech recognition in which a single criterion or set of criteria is selected manually by the user, from plural classes of recognition criteria. The stored classes of recognition criteria include a default class optimized for an average user in normal conditions, at least one class having a probability of recognition greater than said default class, and at least one class having a probability of recognition less than said default class. Accordingly, the user may select that class of criteria which provides the best results for him or her, as measured by greater accuracy (fewer false positive detections) or fewer instances of non-rejection. An utterance is compared to one or more models of speech to determine a similarity metric for each such comparison. The model of speech which most closely matches the utterance is determined based on the one or more similarity metrics. The similarity metric corresponding to the most closely matching model of speech is analyzed to determine whether the similarity metric satisfies the criteria of the user-selected class. The present application has application to many problems in speech recognition including isolated word recognition and command spotting. Illustrative embodiments of the invention in the context of telecommunications instruments are provided.
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Citations
22 Claims
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1. A speech recognizer apparatus for recognizing a phrase including at least one word, based upon an utterance, the apparatus comprising:
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a plurality of stored recognition criteria sets, each stored recognition criteria set having at least one class of recognition criteria, each stored class being associated with a corresponding probability of recognition for a given utterance; a selection module responsive to a user, wherein said user selects a selected recognition criteria set from said plurality of stored recognition criteria sets; a comparator module, responsive to the selection module, for determining whether a similarity metric corresponding to a most closely matching model of speech satisfies the selected recognition criteria set; and a recognizer module for recognizing the utterance as the phrase corresponding to said most closely matching model of speech when the selected recognition criteria set is satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A telecommunications instrument, comprising:
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a microphone; and a speech recognizer for recognizing a phrase including at least one word, based upon a utterance, the speech recognizer including a plurality of stored recognition criteria sets, each stored criteria set having at least one class of recognition criteria, each stored class being associated with a corresponding probability of recognition for a given utterance; a selection module response to a user, wherein said user selects a selected recognition criteria set from said plurality of stored recognition criteria sets; a comparator module, responsive to the selecting module, for determining whether a similarity metric corresponding to a most closely matching model of speech satisfies the selected recognition criteria set; and a device control circuit responsive to recognition of an utterance by said speech recognizer. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A method of recognizing a phrase including at least one word, based upon an utterance, the method comprising the steps of
comparing the utterance to one or more speech models to determine a similarity metric for each such comparison; -
determining, in a first determining step, which model of speech most closely matches the utterance based on the one or more similarity metrics obtained during said comparing step; selecting, by a user, at least one recognition criteria set from a plurality of stored recognition criteria sets each stored criteria set having at least one class of recognition criteria, each stored class being associated with a corresponding probability of recognition for a given utterance; determining, in a second determining step, whether the similarity metric corresponding to the most closely matching model of speech satisfies the selected recognition criteria set; and recognizing the utterance as the phrase corresponding to said most closely matching model of speech when the selected recognition criteria set is satisfied.
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Specification