Task-constrained connected speech recognition of propagation of tokens only if valid propagation path is present
First Claim
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1. A token-passing speech recognition system for recognising connected speech, the recognition system comprising:
- a network for modelling expected input speech, said network having a plurality of vocabulary nodes, at least one of the vocabulary nodes having an associated signature, andmeans for examining partial recognition paths at decision nodes intermediate the beginning and end of the recognition path, each decision node having an associated set of valid accumulated signatures, wherein a token received by a decision node is only propagated if the accumulated signature of that token reflecting the path of said token through the network is one of those in the set of valid accumulated signatures associated with that decision node.
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Abstract
A speech recognition system recognizes connected speech using a plurality of vocabulary nodes, at least one of which has an associated signature. In use, partial recognition paths are examined at decision nodes intermediate the beginning and end of the recognition path, each decision node having an associated set of valid accumulated signatures. A token received by a decision node is only propagated if the accumulated signature of that token is one of those in the set of valid accumulated signatures associated with that decision node.
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Citations
29 Claims
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1. A token-passing speech recognition system for recognising connected speech, the recognition system comprising:
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a network for modelling expected input speech, said network having a plurality of vocabulary nodes, at least one of the vocabulary nodes having an associated signature, and means for examining partial recognition paths at decision nodes intermediate the beginning and end of the recognition path, each decision node having an associated set of valid accumulated signatures, wherein a token received by a decision node is only propagated if the accumulated signature of that token reflecting the path of said token through the network is one of those in the set of valid accumulated signatures associated with that decision node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A speech recognition system comprising:
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a network for modelling expected input speech, the network having a plurality of vocabulary nodes for processing input speech, each vocabulary node being associated with at least one word representation model operable to produce a first parameter indicating the degree of similarity between the input speech and speech deemed to be recognised; comparing means for comparing the first parameters from distinct word representation models and, in response to this comparison, for determining the parameter to be propagated through the network; means for determining, at an output of the network, the parameter having the highest degree of similarity and the input speech deemed to be recognised; means for allocating a signature to at least one of the vocabulary nodes; means for associating with each first parameter a second parameter representing the accumulated signatures of a path through the network; and validation means for validating that the second parameter associated with a first parameter is included in a valid set of second parameters, the first parameters being propagated through the network only when the associated second parameter is one of those in a set of valid second parameters. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of recognising connected input speech, said method comprising.
generating a network for modelling expected input speech, the network having a plurality of vocabulary nodes, each vocabulary node being associated with at least one word representation model capable of producing a first parameter indicating the degree of similarity between the input speech and the speech deemed to be recognised; -
comparing the first parameters from distinct word representation models and, in response to this comparison, determining which parameters are to be propagated through the network; determining, at an output of the network, the parameter having the highest degree of similarity and the input speech deemed to be recognised; allocating a signature to at least one of the vocabulary nodes; and associating with the first parameters second parameters representing the accumulated signatures of a path through the network, the first parameters being propagated through the network only when the associated second parameter is one of those in a set of valid second parameters. - View Dependent Claims (18, 19, 20, 21)
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22. A token-passing speech recognition method for recognising connected speech, the recognition method comprising:
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modelling expected input speech using a network having a plurality of vocabulary nodes, at least one of the vocabulary nodes having an associated signature, and partial recognition paths at decision nodes intermediate the beginning and end of the recognition path, each decision node having an associated set of valid accumulated signatures, wherien a token received by a decision node is only propagated if the accumulated signature of that token reflecting the path of said token through the network is one of those in the set of valid accumulated signatures associated with that decision node. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification