Path link passing speech recognition with vocabulary node being capable of simultaneously processing plural path links
First Claim
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1. A speech recognition system comprising:
- means for deriving a recognition feature vector from an input speech signal for each of predetermined time frames;
means for modelling predetermined possible input speech comprising a plurality of vocabulary nodes each of which has an associated word representation model and links between said vocabulary nodes;
processing means for comparing the recognition feature vectors with the modelled input speech and for generating a path link for each node and time frame, said path links indicating the most likely prior sequence of vocabulary nodes for each vocabulary node and time frame, each path link comprising a field for storing an accumulated recognition score and a field for storing a reference to the most likely previous path link in the sequence; and
means for indicating recognition of the input speech signal in dependence upon the comparison;
the processing means being capable of processing more than one path link for at least one vocabulary node, other than the final node, in a single time frame.
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Abstract
A path link passing speech recognition system and method recognizes input connected speech. The recognition system has a plurality of vocabulary nodes associated with word representation models, at least one of the vocabulary nodes of the network being able to process more than one path link simultaneously, so allowing for more than one recognition result.
30 Citations
19 Claims
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1. A speech recognition system comprising:
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means for deriving a recognition feature vector from an input speech signal for each of predetermined time frames;
means for modelling predetermined possible input speech comprising a plurality of vocabulary nodes each of which has an associated word representation model and links between said vocabulary nodes;
processing means for comparing the recognition feature vectors with the modelled input speech and for generating a path link for each node and time frame, said path links indicating the most likely prior sequence of vocabulary nodes for each vocabulary node and time frame, each path link comprising a field for storing an accumulated recognition score and a field for storing a reference to the most likely previous path link in the sequence; and
means for indicating recognition of the input speech signal in dependence upon the comparison;
the processing means being capable of processing more than one path link for at least one vocabulary node, other than the final node, in a single time frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of speech recognition comprising:
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deriving a recognition feature vector from an input speech signal for each of predetermined time frames, modelling predetermined possible input speech;
comparing the feature data with the modelled input speech by generating a network containing a plurality of vocabulary nodes associated with word representation models and generating a path link for each node and time frame, the path link indicating the most likely prior sequence of vocabulary nodes for each vocabulary node and time frame, each path link comprising a field for storing an accumulated recognition score and a field for storing a reference to the most likely previous path link in the sequence; and
indicating recognition of the speech independence upon the comparison wherein more than one path link is processed in a single time frame for at least one vocabulary node other than the final node. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification