Apparatus for calculating auto-correlation coefficients.

摘要

Disclosed here is an auto-correlation unit for pattern recognition to obtain auto-correlation functions as for sampled signals, wherein N pieces of sample values Xn (n = 0 to N-1) are extracted from a series of the sample values expressed with an accuracy of optional multi-bits and the auto-correlation coefficients of these N pieces of the sample values obtained. The sum of sample values Xn and Xn- tau ( tau = 0 to P) are calculated. The squared value (Xn + Xn- tau )<2> of the added results is previously memorized in a ROM while being addressed by the resultant sum. The auto-correlation coefficients are available by feeding the output (Xn + Xn- tau )<2> of the ROM and executing calculation as defined by the following equation:
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