SU1246122A1 - Device for selecting features in pattern recognition - Google Patents

Abstract

The invention relates to automation and computing and can be applied in devices for processing number-pulse codes and in devices for recognizing speech patterns. The device for recognizing patterns during recognition of patterns allows one to isolate the first and last SRI pulse in a burst with a period of input pulses varying from burst to burst or with a random distribution of the intervals between pulses in terms of the loss of pulses and the presence of single pulses of interference in front of the burst. The device has an increased accuracy in comparing d by known devices, which is achieved by introducing a waiting multivibrator and two pulse formers that ensure the constant delay of each pulse relative to the first pulse of the packet. 2 Il. W you 4iik Od GO

Description

The invention relates to automation and computer technology and can be used to isolate features when recognizing speech patterns, for example, for processing number-pulse codes, when it is necessary to select the first and last pulse in a pulse sequence.

The aim of the invention is to improve the accuracy of the device.

Figure 1 shows the block diagram of the device; FIG. 2 is a time diagram of the operation of the device.

The device (figure 1) contains the input of the counting trigger 2, the elements And 3 and 4, the waiting multivibrators 5 and 6, the elements And 7 and 8, the element OR 9, the drivers 10 and 11 pulses, zhd; / 1tsii multivibrator 12, trigger 13 , element OR 14, driver 15 pulses, elements AND 16 and 17, device output 18 (first pulse), device output 19 (last pulse).

The time diagrams of fn.2 show the diagrams of the following signals: a - pulses at the input 1, S - pulses at the output of the IZ element, 6 - pulses to you: ode-element I 4, d - pulses at the output of the waiting multivibrator 5, g - pulses at the output of the waiting multivibrator 6, e - pulses at the output of the element OR 9, pulses at the output of the driver 15, h - pulses at a single output of the trigger 13, and - pulse at the output, k - pulse at the output 19, l - pulse at the first pulse of the known devices; m - the pulse at the output of the last pulse of the known device.

Input 1 is connected to the inputs of elements And 3 and 4 and to the counting input of trigger 2, the outputs of which are connected to the inputs of elements And 3 and 4, the inputs of which are connected respectively to the inputs of multivibrators 5 and .6 and to the inputs of elements And 8 and 7, other inputs which are connected respectively to the outputs of the multivibrators 6 and 5 and to the inputs of the element OR 9, the output of which is Connected to the input of the imaging unit 10 pulses and the input of the imaging device 11 pulses, the output of which is connected to the input of the multivibrator 12 and to the zero input of the trigger 13, the unit input of which is connected to the output of the element OR 14, the inputs of which are connected to the outputs

461222

And 7 And B elements and to the reset inputs of the multivibrators 5 and 6, the output of the multivibrator 12 is connected via a pulse shaper 15 to the input of the And 16 element, another input of which is connected to the unit output of the trigger 13 and the Element 17 input, the pulse shaper 10 output is connected to the input element and 17 and to

10 zero input of the trigger 13, the outputs of the elements And 16 and 17 are connected respectively to the outputs of the device 18 and 19. Formers 10 and 15 form

15 pulses on the rear edges of the input pulses, and driver 11 - on the front edges of the input pulses.

The device works as follows.

20 The initial conditions of the triggers are arbitrary, suppose that the trigger is 2 to 1, and the trigger is 13 to O. Consider the following mode of operation of the device when the Tg period of the input sequence varies from pack to pack within (Tg,,)

., and individual pulses or groups of pulses are missing. The intervals Tn between the pitch must be not less than 30 vectors of Tn

35

40

45

missions

TP „,„ t ,,, where T. ,, T ,,

° min

50

(ha + 1). T

in and,

MQKC

. Tp, „„ and Tp „,

- respectively, the duration of the minimum and maximum interval between input pulses;

- respectively, the duration of the minimum and maximum intervals between bursts of pulses;

- pulse duration of multivibrators 5 and 6;

m is the number of pulses.

The first impulse of the pack (figure 2, plot q)) g: switches trigger 2 into O, 55 passes through the element I 3 and starts the waiting multivibrator 5 (figure 2, plots S, g). Through the element And 8 the first impulse does not pass, since

f g, 6,

3

the output of the multivibrate 6 is the low-level potential (FIG. 2, plot). On the leading edge of the output pulse of the multivibrator 5, the shaper 11 impulses a pulse coinciding in time with the first pulse, which arrives at the zero input of the trigger 13, and also starts the waiting multivibrator 12, the duration of the output pulse of the multivibrator 12 is chosen equal to t, j ,, j t9, tg ,,. The second pulse of the packet arrives at an interval shorter than the duration of the output pulse of the multivibrator 5 t ,, Yu (, (t + 1). Therefore, it passes through the elements 4 and 7 and enters the reset input of the multivibrator 5, stopping the formation of the output pulse. The pulse from the output of the element H 7 passes through the element HJII-i 14 and switches the trigger 13 in. 1 (figure 2, plot 3).

Subsequent pack pulses, arriving at intervals smaller than (t + 1) Tg, alternately start pending multivibrators 5 and 6 so that the output of the OR 9 element generates a pulse whose duration is equal to the sum of the duration of the pack T and the duration (Fig. 2, epu - ra e).

Elements 12 and 15 form an output pulse, after a time t ,, relative to the first pulse of the packet. This pulse enters the input element And 16 and, since the trigger 13 in 1, passes to the output 18 of the first pulse (figure 2, plot c).

With group skip m pulses (figure 2, plot a), the device does not generate a pulse at output 19, because multivibrator 5 in this case does not have time to form an output pulse of full duration, since it is reset by the first pulse that has been scared after a group pass. The same pulse triggers the multivibrator 6, therefore, the output of the element OR 9 does not form the leading edge of the pulse, on which the driver of 10 pulses should trigger. This driver is triggered only in the case of the end of the bundle, when multivibrator 5 generates an output pulse of full duration t ,,, and multivibrator 6 does not start. The pulse from the output of the shaper 10 passes through the element And 17 on you

224

move 19, the last impulse (figure 2, plot k), as well as its falling front, sets trigger O in O. The time interval between the pulses at outputs 18 and 19 is equal to T, i.e. the duration of the input pulse pack.

When a single pulse of interference is received, one of the waiting multivibrators 5 and 6 is triggered and a pulse of 6 q6poca O of the trigger 13 is generated, which prohibits the output of pulses to the outputs 18 and 19.

The device operates similarly with simpler input sequences.

5 10 15 20

25 so

.

0. 5 0 5

five

Claims (1)

Invention Formula A device for identifying features in pattern recognition, containing two triggers, two waiting multivibrators, six AND elements, two OR elements and a first pulse generator, and the first trigger input connected to the first inputs of the first and second AND elements is the input of the device, the second inputs of the first and second elements And are connected to the outputs of the first trigger, and the outputs respectively to one of the inputs of the third and fourth elements And and to the inputs of the first and second waiting multivibrators, the outputs of which are connected The first element OR and the other inputs of the third and fourth elements AND whose outputs are connected respectively to the inputs of the second element OR and the reset inputs of the first and second waiting multivibrators, the output of the first element OR are connected through the first driver of the pulses with the first zero input of the second trigger and with one of the inputs of the sixth element AND, the output of which is one of the outputs of the device, the output of the second element OR is connected to the single input of the second trigger, whose single output is connected Inen with one of the inputs of the fifth element I, the output of which is another output of the device, characterized in that, in order to improve the accuracy of the device, it contains serially connected second pulse generator, third amplifying multivibrator and third pulse shaper, output which is connected 512461226 To the other input of the fifth element I, the second zero input of the second trigger, the output of the first element SH, is connected to a ger, whose single output is connected with the input of the second driver to another input of the sixth elec- trograph, whose output is connected to ment I.