SU1257675A1 - Device for selecting features in pattern recognition - Google Patents

Abstract

The invention relates to the field of automation and computer technology, in particular, to devices for identifying signs when recognizing patterns, and can be used to isolate the first and last pulses in a packet, for example, in diagnosing random processes for distinguishing periodicities and in recognizing patterns. The aim of the invention is to increase the reliability of the device by introducing a pulse separator, providing protection against accidental interference, and time-to-voltage transducers with amplitude detectors, ensuring the storage of information about the duration of the selected pulses. 2 Il. 1C ate sl od h sp

Description

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The invention relates to automation and computer technology, in particular, to devices for selecting signs when recognizing patterns, and can be used to isolate the first and last impulses in a packet, for example, in diagnosing random processes for distinguishing periodicities and in recognizing patterns. The purpose of the invention is to increase the reliability of feature selection.

On. FIG. 1 shows a block diagram of the device; in fig. 2 - voltage diagrams for the operation of the device.

The block diagram of the device (Fig. 1) contains the first trigger 1, blocks 2 of forming analog signals, including time-voltage converters 3, amplitude detectors 4 and pulse shapers 5, the first 6 and 7, and the second 8 and 9 groups of elements And, the first 10, the second 11, the third 12 OR elements, the delay element 13, the AND element 14, the first group of for- {€ €; lei 15 and 16 pulses, the analog-JJ and the converter 17, made in the form of a voltage converter - time, dispenser 18 pulses, including a group of flip-flops 19 and 20, fourth element OR 21, generation torus 22 pulses, the second group of formers 23 and 24 pulses, the third t of the group of elements Fi 25 and 26, the elements NOT 27 and 28, the elements 35 or 29 and 30 groups, the fourth group of elements And 31 and 32, counters 33 and 34, the switch 35 comprising the second 36 and third 37 triggers, the fifth group of elements 38 and 39 and the fifth element OR 40.

The device works as follows.

The input pulse sequence (Fig. 2a) is applied to the counting input of flip-flop 1. The latter, with the arrival of each input pulse, changes its state to the opposite and feeds the enable signal alternately to the first input of the first 6 or second 7 elemen. which are input pulses.

Suppose that the first impulse input sequence 1) appears at the output of AND 6 (FIG. 25), then the next impulse received at the input of the device passes to

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output element And 7 (Fig, 2 V) and switches the trigger 1 to skip the next pulse to the output elements And 6 and 7. The pulse from the output element And 6 is fed to the input of the trigger 19, is installed on its output enable signal (Fig. 2.} And the input element is And 25. Since there is no permit signal from the output of the trigger 20, this pulse does not pass to the output of the element 26, but is converted by the converter 3 during the pulse to a voltage, the maximum value of which is stored in the amplitude detector 4 (Fig .2e).

The shaper 5, by the negative voltage drop from the output of the element 6, produces a pulse arriving at the reset of the amplitude detector 4 of the other block 2, and is set at its output low level. The enable signal from the output of the trigger 19 (Fig. 2d) is fed to the inputs of the elements IZ, 25 and 31 and the element OR 21, the enabling signal at the output of which triggers the generator 22 of pulses. The pulses of the generator 22 (FIG.) Are fed to the inputs of the elements 25 and 26, and since there is no enabling signal from the output 5 of the flip-flop 20, these pulses do not pass to the control input of the counter 34, and from the output of the element 25 the generator pulses 22 are fed to the control input of the counter 33. The coefficient of recalculation of the counters is chosen the same and such that the duration of the pulses at the output of the counters is longer than the maximum period between pulses, which can still be attributed to a burst of pulses.

The permissive signal from the output of the counter 33 is fed to the input of the element HE 27 through the time determined by the counter conversion factor and the generator frequency. The inverted signal from the output of the counter 33 (FIG. 2 |) is fed to the inputs of the elements And 8 and 31. From the output of the element And 31, the signal goes to the inputs of the elements IZH TO and 29. The shaper 15 by positive voltage drop from the output of the elements OR 10 generates a pulse (Fig. 2o), which establishes through the element OR 40 an enabling signal at the output of the flip-flops 36 and 37 of the switch 35. The signal at the output of the element AND 8 P appears when the enabling signals generated by the trigger coincide

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19, the element HE 27, and the signal at the output of the element And 7, i.e. upon receipt of the second pulse packs.

Pulse C: output element And 8 through element OR 11 and delay element 13 enters input of element 14, with the arrival of which converter 17 converts the voltage from the output of amplitude detector 4 of unit 2 to a pulse whose duration is determined by the amplitude received at its input.

With the arrival of a pulse on the trigger input of the trigger 36, the latter changes its state to the opposite, allowing the passage of the first altered pulse to the first output of the device (Fig. 2k). The selected pulse arriving at the input of the trigger 37 removes the enabling signal from its output, prohibiting further passage of the pulses to the triggering input of the converter 17. Subsequent pulse packs do not pass to the device output, since the second input of the And 14 element does not have an enabling signal the input pulses, following in the pack, at the inputs of the formers 15 and 16, the voltage level will be constantly high. The former 16 generates a pulse under the influence of a negative voltage drop at its input. This pulse through the OR 40 element sets a signal at the output of the trigger 37 that permits the passage of the last pulse in the packet to the trigger input of the converter 17. The pulse from the last output changes the state of the trigger 36, allowing the last pulse in the packet to pass to the second output of the device.

The triggers 19 and 20, the counters 33 and 34, are set to the initial state by pulses generated by the formers 23 and 24, respectively, with the appearance of negative voltage drops at the outputs of the elements And 8 and 31 or 9 and 32.

When a single pulse device appears on the drive, a counter 33 or 34 starts, but there is no next pulse, a pulse is output at the output of the AND 8 or 9 elements, respectively, there is no pulse at the trigger input of the converter 17. At the same time, the drivers 5 blocks 2 produce a pulse

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4, although the shaper 15, according to the negative voltage drop of the counter, generated a pulse, which triggers trigger 37 and sets an enable signal at one input of the element 14, but there is no pulse at that.

Introducing new elements into the device allows us to significantly increase the reliability of feature extraction when recognizing patterns, in particular, to select packs of pulses with varying duration and follow-up period of pulses with a large ratio of immiscii in a pack. This makes it possible to use the proposed device for pattern recognition of random sequences and to determine the boundaries of the pulse bursts in time.

Claims (1)

1. A device for character selection during pattern recognition, containing the first group of elements AND, some inputs of which are the first input of the device, others connected to the corresponding outputs of the first trigger, whose input is connected to the first input of the device, and outputs connected to the inputs of the corresponding analog signal generation units and with one 11 inputs of the corresponding elements AND of the second group, the first group of pulse shapers, whose inputs are connected to the output of the first OR element, and the outputs are connected to n The first and second inputs of the switch, the third input of which is connected to the output of the analog-digital converter, and the outputs are the outputs of the device, the second OR element, whose inputs are connected to the outputs of the AND elements of the second group, and the output connected to the delay element whose output is connected to one input of the element And, the other input of which is connected to the corresponding output of the switch, and the output is connected to one input of the analog-digital converter, the other input of which is connected to the output of the third element SH, whose inputs from are united with one outputs of the analog signal conditioning units, while the input of the first analog signal conditioning unit is connected to the output of the second analog signal generation unit, and the input of the second analog signal generation unit is connected to the output of the first block, the generator and my1k, the output of which is connected to one input of the third group elements, the second group of pulse shapers, tf & RT or the element and NOT, characterized in that, in order to increase the reliability of feature selection, it contains a group of triggers, one inputs of which are connected to the outputs of the corresponding element And in the first group, the other connected to respective pulse shaping vyhodgsh second rpj nnbi, and the outputs are joined by other input keys 20 corresponding to the respective inputs of AND for- constituent elements of the third group tors, and the second group. the inputs of the fourth element OR, the output of which is connected to the input of the pulse generator, the counters whose outputs are connected to the outputs of the corresponding pulse shapers of the second group and the elements AND the third group, and the outputs are connected to the inputs of the corresponding elements NOT, the outputs of which are connected to the inputs of the corresponding elements And the second groups, and sequentially connected elements AND of the fourth group, the inputs of which are connected to the outputs of the corresponding elements NOT and the group triggers, and the outputs are connected to the inputs of the first element IL and elements OR groups, the other inputs of the latter are connected to the outputs of the corresponding elements AND the second group, and the outputs under