Learning device for digital signal pattern recognition

Communications: electrical – Digital comparator systems

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G06K 900

Patent

active

043273548

ABSTRACT:
A device for recognizing overall patterns of digital signals which are arranged according to at least one coordinate comprises: first storage means for the storage of a pattern to be presented for comparison; a window device for selecting a local pattern of a number of digital signals from the overall pattern; a stepping mechanism for coordinate-wise adjustment of the window device over a step; a gradient determining device for determining, for predetermined coordinate values within the window, the absolute value of the coordinate-wide gradient of the values of the digital signals prevailing at said coordinate values; a moment generator for receiving these absolute values, for determining the moment therefrom with respect to a focussing point of the window, and for generating an output signal when a predetermined minimum value of said moment is reached in order to indicate the reaching of a local maximum in said coordinate-wise gradient; second storage means for the storage of a number of reference patterns; and a difference determining device for comparing, under control of the output signal of the moment generator, a local pattern selected by the window device with the reference patterns and for alternatively forming a non-correspondence/correspondence signal. If the difference is too large, the "new" pattern is stored as a further reference, so that the learning phase and the use phase occur simultaneously. The comparison does not take into account a difference near substantially coincident acute amplitude gradients.

REFERENCES:
patent: 3016518 (1962-01-01), Taylor
patent: 3088096 (1963-04-01), Steinbuch
patent: 3701095 (1972-10-01), Yamaguchi et al.
patent: 3846755 (1974-11-01), Hart
patent: 3936800 (1976-02-01), Ejiri et al.
patent: 4005385 (1977-01-01), Joynson et al.

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