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US 6,487,530 B1Granted
Method for recognizing non-standard and standard speech by speaker independent and speaker dependent word models
AssigneeNortel Networks Limited
InventorsLin Lin, Ping Lin
Life of this patent
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Abstract
A system and method for speech recognition includes a speaker-independent set of stored word representations derived from speech of many users deemed to be typical speakers and for use by all users, and may further include speaker-dependent sets of stored word representations specific to each user. Utterances from a user which match stored words in either set according to the ordering rules are reported as words.
Claims10
In a speech recognition system comprising:
- an incoming audio signal representing utterances of a user;
- a stored set of first word models derived from utterances of a plurality of speakers;
- and
- means for identifying a word in the utterances of a user upon matching portions of said audio signal with one of said stored first word models,
- a method of enhancing recognition of speech of said user comprising:
- ascertaining a current context of the utterances of the user;
- providing for said user a stored set of second word models, said set of second word models derived from words spoken by said user, said first word models and said second word models differing from each other;
- attempting to identify words in the utterances of said user to find a match in the current context by comparing portions of said audio signal with one of a word model among said first word models and a word model among said second word models associated with said user, the attempting including determining a probability of whether the match exceeds a threshold;
- and
- if the probability of the match fails to exceed the threshold, informing that the words fail to match any of the words acceptable in the current context and thereafter modifying, based on the words in the utterances of said user, the word model among the second word models associated with the user and without modifying the stored set of first word models.
7 more elements
A method of enhancing speech recognition comprising:
- providing a set of user-independent word models derived from utterances of a plurality of speakers;
- providing a set of user-dependent word models for ones of a plurality of users each of the user-dependent word models being derived from utterances of an associated one of said users, said user-independent word models and said user-dependent word models differing from each other;
- ascertaining a current context of the utterances of the user;
- attempting to match an utterance from one of said users to one of said user-independent word models to find a possible match in the current context;
- and
- attempting to match another utterance from said one of said users to one of said user-dependent word models to find a further match in the current context,
- determining probabilities of whether the possible match and the further match exceed a threshold;
- and
- if the probabilities of the possible match and the further match fail to exceed the threshold, informing that the words fail to match any of the words acceptable in the current context and thereafter modifying, based on the words in the utterances of said user, the user-dependent word models and without modifying the provided set of user-independent word models.
6 more elements
Dependencies are inferred from the claim text.