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Signal pattern recognition apparatus comprising parameter training controller for training feature conversion parameters and discriminant functions

  • US 5,754,681 A
  • Filed: 06/22/1995
  • Issued: 05/19/1998
  • Est. Priority Date: 10/05/1994
  • Status: Expired due to Term
First Claim
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1. A signal pattern recognition apparatus for classifying an inputted signal pattern into one of a plurality of predetermined classes so as to recognize the inputted signal pattern, comprising:

  • a plurality of feature transformation means for respectively transforming the inputted signal pattern into vectors in a plurality of feature spaces corresponding respectively to said classes by executing a feature transformation process by means of a predetermined transformation parameter corresponding to each of said classes so as to emphasize a feature of each of said classes, said feature transformation means being provided respectively for said plurality of classes;

    a plurality of discriminant function means for respectively calculating a value of a discriminant function by means of a predetermined discriminant function representing a similarity measure of each of said classes for said vectors in said plurality of feature spaces which are transformed by said plurality of feature transformation means, said discriminant function means being provided respectively for said plurality of classes;

    selection means for executing a signal pattern recognition process by selecting a class to which the inputted signal pattern belongs based on the values of said plurality of discriminant functions corresponding respectively to said classes, said discriminant functions being obtained through said calculation executed by said plurality of discriminant function means; and

    training control means for training and setting said plurality of transformation parameters of said feature transformation process and said plurality of discriminant functions, so that an error probability of said signal pattern recognition is minimized based on a predetermined training signal pattern.

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