Learning device for digital signal pattern recognition
First Claim
1. A device for recognizing a pattern of a predetermined number of separate digital signals which are arranged according to at least one coordinate and each of which has a signal value, the device comprising an input with first storage means for receiving and storing said pattern, second storage means with a predetermined number of storage locations, each of which has a storage capacity for a corresponding pattern, a difference determining device with a first input which is connected to a data output of the first storage means, a second input which is connected to a data output of the second storage means, and an output for alternatively supplying a non-correspondence/correspondence signal, characterized in that for the recognition of a local pattern which is selected from a overall pattern by way of a coordinate-wise adjustable window device, the window device comprises a stepping mechanism in order to be adjusted coordinate-wise over a step, a gradient determining device being provided for determining, for predetermined coordinate values within the window, the absolute value of a coordinate-wise gradient of the values of said digital signals prevailing at said coordinate values, a moment generator for receiving said absolute values and for determining a moment thereof with respect to a reference point of the window, and for generating an output signal when a predetermined minimum value of said moment is reached in order to indicate that a local high value is reached of the value of said coordinate-wise gradient averaged over the local pattern, a connection being provided for supplying said output signal as an activation signal to said difference determining device.
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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.
29 Citations
10 Claims
- 1. A device for recognizing a pattern of a predetermined number of separate digital signals which are arranged according to at least one coordinate and each of which has a signal value, the device comprising an input with first storage means for receiving and storing said pattern, second storage means with a predetermined number of storage locations, each of which has a storage capacity for a corresponding pattern, a difference determining device with a first input which is connected to a data output of the first storage means, a second input which is connected to a data output of the second storage means, and an output for alternatively supplying a non-correspondence/correspondence signal, characterized in that for the recognition of a local pattern which is selected from a overall pattern by way of a coordinate-wise adjustable window device, the window device comprises a stepping mechanism in order to be adjusted coordinate-wise over a step, a gradient determining device being provided for determining, for predetermined coordinate values within the window, the absolute value of a coordinate-wise gradient of the values of said digital signals prevailing at said coordinate values, a moment generator for receiving said absolute values and for determining a moment thereof with respect to a reference point of the window, and for generating an output signal when a predetermined minimum value of said moment is reached in order to indicate that a local high value is reached of the value of said coordinate-wise gradient averaged over the local pattern, a connection being provided for supplying said output signal as an activation signal to said difference determining device.
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5. A device for recognizing a pattern of a predetermined number of separate digital signals which are arranged according to at least one coordinate and each of which has a signal value, the device comprising an input with first storage means for receiving and storing said pattern, second storage means with a predetermined number of storage locations, each of which has a storage capacity for a corresponding pattern, a difference determining device with a first input which is connected to a data output of the first storage means, a second input which is connected to the data output of the second storage means, and an output for alternatively supplying a non-correspondence/correspondence signal, characterized in that for the recognition of a local pattern selected from an overall pattern by means of a window device which can be focussed coordinate-wise, the window device comprises a stepping mechanism in order to be focussed coordinate-wise over a step, a gradient determining device being provided for determining, for predetermined coordinate values within the window, the absolute value of a coordinate-wise gradient of the values of said digital signals prevailing at said coordinate values, the difference determining device comprising means which serve to ignore the predetermined difference generated for a given coordinate value if a pair of signals from first and second storage means which is presented for comparison exhibits a predetermined difference for said coordinate value while the relevant patterns both have a predetermined coordinate-wise gradient in the signal value for said coordinate value.
Specification