Speech pattern recognition using pattern recognizers and classifiers
First Claim
1. Apparatus for recognizing word patterns, comprising:
- an input for signal data; and
at least two stages of recognition comprising;
a pattern matching stage which includes a plurality of stores each storing a representation of a pattern to be recognized and means for producing, for each said representation, a measure of the similarity between the signal data and that representation; and
a classification stage having a plurality of inputs, each input being connected to receive the measures of similarity produced for one of said representations,the classification stage deciding on the basis of taking into account all of the said measures which, if any, of the patterns to be recognized to which the representations correspond is present in the signal data, and which indicates the presence of any such pattern,the classification stage being trainable, with parameters of the classification stage derived from information related to a predetermined pattern represented by signal data input to the pattern matching stage and from the measures of similarity produced for each said representation from input of said signal data representing the predetermined pattern.
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Abstract
An apparatus for recognizing predetermined patterns comprises an input for signal data; a pattern matching stage including a plurality of stores, each storing a representation of a pattern to be recognized; a similarity measurer for producing, for each representation, a measure of the similarity between the signal data and that representation; and a classification stage for deciding from the similarity measures which, if any, of the patterns to which the representations correspond is present in the signal data, and for indicating the presence of any such pattern. The classification stage makes its determination based on all the similarity measures after having been trained using information relating to known patterns and the similarity measurer from the pattern matching stage produced by inputting known patterns.
40 Citations
23 Claims
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1. Apparatus for recognizing word patterns, comprising:
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an input for signal data; and at least two stages of recognition comprising; a pattern matching stage which includes a plurality of stores each storing a representation of a pattern to be recognized and means for producing, for each said representation, a measure of the similarity between the signal data and that representation; and a classification stage having a plurality of inputs, each input being connected to receive the measures of similarity produced for one of said representations, the classification stage deciding on the basis of taking into account all of the said measures which, if any, of the patterns to be recognized to which the representations correspond is present in the signal data, and which indicates the presence of any such pattern, the classification stage being trainable, with parameters of the classification stage derived from information related to a predetermined pattern represented by signal data input to the pattern matching stage and from the measures of similarity produced for each said representation from input of said signal data representing the predetermined pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A speech recognizer comprising:
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means to pre-process speech signals to extract significant features of those signals; store means to hold reference features corresponding to known speech patterns to be recognized; comparison means to compare the features extracted from said speech signals with stored reference features and to produce for each comparison a measure of the similarity therebetween; and decision means having a plurality of inputs, each input connected to receive the measures of similarity produced for one of said features, said decision means determining on the basis of all said measures of similarity the speech pattern to which an input signal is most similar; characterized in that said decision means is one which has been trained using information relating to a known predetermined speech pattern represented by speech signals input to the means to pre-process speech signals and the measures of similarity produced by the comparison means for each said feature from the input of speech signals representing the said known predetermined speech pattern. - View Dependent Claims (13, 14)
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15. A method of training a pattern recognition apparatus comprising:
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receiving input signal data; comparing the input signal data with each of a plurality of stored representations each corresponding to a pattern to be recognized to produce a similarity measure for each of the plurality of stored representations; and deriving parameters for a decision means for having a plurality of inputs connected to receive said similarity measures produced for one of said representations from information relating to a predetermined pattern and from (b) the said similarity measures produced for each representation on receiving input signal data corresponding to the predetermined pattern. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification