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Auto-correlation circuit for use in pattern recognition

  • US 5,007,101 A
  • Filed: 12/28/1982
  • Issued: 04/09/1991
  • Est. Priority Date: 12/29/1981
  • Status: Expired due to Term
First Claim
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1. An auto-correlation unit for providing auto-correlation coefficients for use as feature parameters in pattern recognition for N pieces of sampled input values Xn (n=0 to N-1), said unit comprising:

  • means for extracting N pieces of sample input values Xn from a series of sample values in an input pattern expressed with an accuracy of optional multi-bits;

    means for calculating the sum of the sample values Xn and Xn-τ



    =0-P, P≦

    N);

    a read only memory associated with said means for calculating;

    means for feeding to said read only memory the sum of the sampled input values as an address signal;

    means for storing in said read only memory the squared value of each sum, (Xn +Xn-τ

    )2 ;

    means for fetching and outputting the squared values of each such sum of the sample input values from said read only memory when said memory is addressed by the sum of the sample input values; and

    means responsive to the output (Xn +Xn-τ

    )2 of said read only memory for providing an auto-correlation coefficient for use as a feature parameter according to the following formula;

    ##EQU14##

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