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US 5,845,245 AGranted
Method and apparatus for reducing false rejection in a speech recognition system
AssigneeNorthern Telecom Limited
InventorsVishwa Gupta, Serge Robillard
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AssigneeNorthern Telecom Limited
InventorsVishwa Gupta, Serge Robillard
Estimating the term…
The invention relates to a method and apparatus for grouping orthographies in a speech recognition dictionary to reduce false rejection. In a typical speech recognition system, the process of speech recognition consists of scanning the vocabulary database by using a fast match algorithm to find the top N orthography groups. In a second pass the orthographies in the selected groups are re-scored using more precise likelihoods. The top orthographies in the top two groups are then processed by a rejection algorithm to find if they are sufficiently distinct from one another. In the affirmative the top choice candidate is accepted, otherwise the entire procedure is terminated. The novel method comprises the steps of grouping confusable orthographies together to reduce the possibility of false rejection.
A computer readable medium containing a speech recognition dictionary for use in a speech recognition system that includes a speech recognition layer and a rejection layer, said speech recognition dictionary including a plurality of orthography groups, each orthography group including a plurality of individual orthographies, at least one of said groups including a pair of confusable orthographies where in the event said pair of confusable orthographies are processed by the rejection layer a high probability exists that the rejection layer will reject a selected one of said pair of confusable orthographies by the speech recognition layer.
A computer readable medium containing a speech recognition dictionary for locality recognition for use in an automated directory assistance system that includes a speech recognition layer and a rejection layer, said speech recognition dictionary including a plurality of orthography groups, each orthography group including a plurality of individual orthographies, at least one of said groups including a pair of confusable orthographies where in the event said pair of confusable orthographies are processed by the rejection layer a high probability exists that the rejection layer will reject a selected one of said pair of confusable orthographies by the speech recognition layer, every orthography in at least one group of said speech recognition dictionary other than said one group being indicative of a substantially identical geographical area.
A speech recognition system, comprising:
A process for reducing a likelihood of false rejection in a speech recognition system that includes:
An apparatus for re-arranging a speech recognition dictionary for use in a speech recognition system that includes a speech recognition layer and a rejection layer, the speech recognition dictionary including a plurality of orthographies potentially recognizable by the speech recognition layer on a basis of a spoken utterance by a user of the speech recognition system, said apparatus comprising:
A machine readable medium containing a program element for instructing a computer for generating a speech recognition dictionary for use in a speech recognition system that includes a speech recognition layer and a rejection layer, the speech recognition dictionary including a plurality of orthographies, said computer including:
Dependencies are inferred from the claim text.