SU1727142A1 - Signal extraction device for analysis of moving objects - Google Patents

Abstract

The invention relates to automation and computing and is intended to identify moving objects in detection, security, and flaw detection systems. The aim of the invention is to improve the accuracy of the device. The goal is achieved by the fact that the device containing the signal analysis unit, the output signal shaping unit, the signal selection unit, additionally introduces a signal switcher and a pulse generator. The signal analysis block contains a trigger and two NAND elements. The introduction of additional elements into the device provides an analysis of the relative speed, direction and other parameters of the moving object. 1 hp ff, 2 ill.

Description

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The invention relates to automation and computing, in particular, to devices for registering and identifying moving objects, for example, in automatic detection (guard) systems, in flaw detection, in the analysis of moving objects,

The purpose of the invention is to improve the accuracy of the device by taking into account the differences in the position of the object in time.

FIG. 1 shows a block diagram of a device with an embodiment of its blocks; in fig. 2 - timing diagrams for the operation of the device.

A device for extracting signals from 1 moving objects contains input 1, information input 2, 3 pulse generator, signal analysis unit 4, output signal generating unit 5 with output 6, signal selection block 7 with output 8, and signal switch 9 with inputs 10.

The signal analysis unit is made on the element AND-EE 11, the trigger 12 and the element AND-NOT 13.

The output signal generating unit is made on the element 14 and the element 15.

The block selection signal is made on the element And 16 and the expander pulses 17.

Switch 9 contains an AND element, the two inputs and output of which are the inputs and output of the switch, the third input of which is connected to the third input of the element I. through a frame clock counter.

In the initial state, when there are no signals at the inputs 1 and 2, from the trigger 12 the signal of the logical unit arrives at the AND-HE 11 element, and the logical zero element arrives at the IS-NOT 13 element. A signal is input to input 10, according to which switch 9 outputs a logical zero signal at the output. On elements and 14

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and 16 from the side of elements 15 and 17 a logical unit signal is given.

During operation, inputs 1 and 2 of the device synchronously with the period of the frame frequency receive binary signals of objects. Through the trigger input 1, the generator 3 receives signals that were fixed at the time instant to (Fig. 2.1), and are repeated after the time tn ti. The generator generates short pulses corresponding to the edges of the input signal {FIG. 2.2). which through the open element AND NOT 11 affect the installation input of the trigger 12.,

Via information input 2, the input of the analyzer 4 at the current time ti receives signals from objects that are both in motion and "quiescent state" (Fig. 2.3). The trigger 12 compares the signals received at its inputs. If the signals on the setup and second information inputs of the trigger coincide in time, the trigger does not switch due to the priority of the setup input. At the output of the analysis unit 4 and the device output 6, there is no signal (Fig. 2.4). This indicates that the signals of the object were received at the inputs 1 and 2 of the device, which during the time ti did not change its position.

If the signals at the above trigger inputs do not coincide in time, then the trigger 12 is switched by the leading edge of the binary signal received at information input 2 and returns to its initial state by the falling edge of the same signal passed through the element AND- NOT 13 to the first information input trigger

In the switched state, trigger 12 closes the NAND 11 element. Prohibiting passage to its installation input of generator 3 signals.

Gates selected by the trigger through the open element And 14 arrive at the output 6 of the device and are binary signals of objects that have changed their position relative to their position in time to.

At the time ti, the device is divided, the signals of the contour elements that come from generator 3, "and two parts: signals that match, and signals that do not coincide in time with the trigger gates 12. Signals of these parts of the contours are tinted opposite polarity.

For this, short pulses of the generator C through the switch 9 are sent to elements 15 and 16. At the output of the element NOT 15, signals are output, for example, negative polarity (Fig. 2.5), and at the output of the element I 16 and the output 8 of the device - positive polarity (Fig. 2.6).

Under the influence of input signals

Element 14 at the output 6 of the device selects positive polarity signals and signals of negative polarity contour elements embedded in it (Fig. 2.7). The expander 17 provides an increase in the duration of the binary signal by the delay in the formation of the falling edge by the value of the duration of the pulses of the generator 3 and the inversion of the received signal. Extender output signal as prohibiting

in element 16, it suppresses the pulses of generator 3, which coincides with it.

The switch 3 arriving at its input from the generator 3 pulses commutes with a low frequency meander, which forms

pulse counter of the switch, to the input of which a frame synchronization signal of binary signals arriving at the inputs 1 and 2 of the device arrives.

Switch operation provides flicker, i.e. additional signal tinting of all elements of the circuits at the outputs 6 and 8 of the device.

By analyzing the signals of the objects shown in FIG. 2, one can judge the speed, direction and other parameters of the movement. Thus, objects 11 and 12 move horizontally towards each other, with object 11 moving two times slower than object 12 (a and 2a).

respectively), objects 14 and 15 have not only horizontal shifts, but also vertically. The information content of the output signals of the device increases when all the elements of the contours and images of moving objects are taken into account.

The device has a high accuracy of the selection of objects and provides for the separation of the signals of the contours of a priori images of objects into two parts, one of

which coincides with the signals of moving objects, and the friend does not coincide, tint the different parts of the contours with polarity and flickering of signals.

The increased information content of the device output signals makes it possible to analyze the relative speeds, directions, and other parameters of moving objects.

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Claims (2)

1. A device for extracting moving object signals comprising a signal analysis unit, the information input of which is the device input and the output connected to the information input of the block generating output signals, the output of which is the first output of the device, and a signal selection unit, the output of which is the second output of the device, distinguished by the fact that, in order to improve accuracy, a signal switch and a pulse generator, the trigger input of which is the start input of the device, and the output is connected to the control input of the signal analysis unit and the information input of the switch, the output of which is connected to the control input of the output signal generation unit and the control input Odom block selection signals, informational the input of which is connected to the information input of the signal analysis unit. 2. The device according to claim 1. about tl and h and u more, because the signal analysis unit contains the trigger, the outputs of which are connected to the first inputs of the first and second elements AND NAND, respectively; the second inputs of which are respectively the information and control inputs of the block, information inputs of the trigger are connected to the output of the first NAND element and its second input, respectively; the installation input of the trigger is connected to the output of the second NAND element, direct output the trigger is a block output.