SU1718372A2 - Device to extract and subtract first pulse out of series - Google Patents

Abstract

The invention relates to a pulse technique and can be used in control and data acquisition systems, as well as for the formation of labels in the transmission of information requiring subsequent processing. The aim of the invention is to improve the noise immunity of the device. The goal is achieved by including a pulse train analyzer comprising a counter 13, a decoder 11, an asynchronous trigger 15 and an AND 14 element whose output signal on the And 10 element gates an input pulse series delayed by the element 12. In addition, the device includes a generator 1, a pulse counter 2, a code comparison element 3, a memory register 4, a time interval meter 5, a driver 6, the first 7 and second 9 AND elements, as well as the first asynchronous trigger. 8. At the same time, the control signal is fed to the bus 16. And the input pulse train is fed to the bus 17. A dedicated first pulse is formed on the output bus 18, and the remaining pulses of the input pulse train are output on the output bus 19. 2 Il. (Ls

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The invention relates to a pulse technique, can be used in devices for processing pulse signals and is an improvement of the invention according to the authors. St. No. 1275655.

A device comprising a trigger, a control bus, a pulse train, a switch with a memory of the control signal is known.

However, this device is characterized by low noise immunity.

It is also known a device comprising a clock bus, three input buses, the first AND-NOT element, the NOT element, the second IS-NOT element, a trigger.

However, this device is characterized by low noise immunity.

The closest in technical essence is a device containing a pulse generator, the input of which is connected to the counting input of the counter, whose R-input is connected to the control bus and the first input of the time interval meter, and the output to the first group of inputs of the comparison element, the output of which is connected to R - the trigger input, and the second group of inputs - with the register outputs, the information inputs of which are connected to the main outputs of the time interval meter, and the c-input - to the additional outputs of the time interval meter c, the second input of which is connected to the S-input of the trigger and the output of the pulse former, the input of which is connected to the first output bus and to the output of the element I, the first input of which is connected to the inverse output of the trigger, and the second input to the output bus of the series of pulses and the first input element And, the output of which is connected to the second output bus, and the second input to the forward output of the trigger.

However, the device is characterized by relatively low noise immunity, due to the impossibility of isolating a pulse sequence with a number of pulses that is different from the specified one, both when the sequence arrives at the device input and when the control signal and the pulse sequence are superimposed.

The aim of the invention is to improve noise immunity.

This goal is achieved by the fact that the device for extracting and subtracting the first pulse from the series between the input bus and the first input of the first element AND includes a serially connected delay element and a third element And, as well as a second pulse counter with a signal decoder connected to its outputs.

the second asynchronous trigger and the fourth element And, the first input of which is connected to the input of the delay element, the second input with the direct output of the second asynchronous

the trigger, the zero input of which is combined with the zero input of the second pulse counter and the output of the comparison code element, and the single input with the control bus of the device, the output of the fourth AND element is connected to the clock input of the second pulse counter, and the decoder output is connected to the second input the third element I.

The third and fourth elements of the second and second trigger, the decoder, the second counter, and the formation of new functional connections allow to control the number of pulses of the input series and exclude from the processing of

0 by the number of pulses different from the given one, both when the series arrives at the input of the device, and when the control signal and the input pulse series coincide in time.

5H FIG; 1 shows a diagram of the device;

in fig. 2 - timing diagrams explaining the principle of operation of the device when processing a series of six pulses.

Device for isolating and subtracting

0 of the first pulse from the series contains a pulse generator 1, the output of which is connected to the counting input of the first counter 2 connected by its outputs to the first group of inputs of the comparison element 3, the second

5 group of inputs is connected to the outputs of register 4, the inputs of which are connected to the outputs of the meter 5 time intervals, the second input of which is connected to the output of the imager 6, the input of which is connected to the output of the first element 2 and 7, the first input of which is connected to the inverse output of the first asynchronous trigger , Whose S input is connected to. the output of the imaging unit 6, and the direct output - with the first input of the second element 2 And 9, the second input of which is connected to the second input of the first element 2 And 7 and to the output of the third element 2 And 10, the second input of which is connected to the output of the decoder 11, the first

0 input - with the output of the delay element 12, the second counter 13, the output of which is connected to the input of the decoder 11, and the counting input - to the output of the fourth element 2 1/1 14, the second input of which is connected to the direct output

5 of the second trigger 15, the R input of which is combined with the R inputs of the second counter 13, the second asynchronous trigger 15 and connected to the output of the comparison element 3, and the S input connected to the control bus 16, the first input of the meter 5 time intervals and the R input of the first the counter 2, the input bus 17 connected to the input of the delay element 12 and to the first input of the fourth element 2 AND 14, the first output bus 18 of the device connected to the input of the former 6, the second output bus 19 of the device connected to the output of the second element 2I 9 .

The device works as follows.

In the initial state, the first 8 and second 15 triggers and the counter 13 are reset. With the arrival of the control pulse (Fig. 2a), the first counter 2 is zeroed and the second trigger 15 is set to one, thereby allowing the input pulse train (Fig. 2.6) to pass to the counting input of the second counter. When the number of pulses of a series corresponds to a given, at a certain output of the decoder (Fig. 2c), a signal appears that allows the delayed series of pulses (Fig. 2d) to pass to the output of 2I 10 element. The delay time of the signal by delay element 12 corresponds to the total propagation delay signal in elements 11, 13, 14 and 15. At the output of element 2 and 7, the first pulse from the series (Fig. 2h) appears, which, having passed through the driver (Fig. 2e), sets the second trigger 8 to the state 1 (Fig. 2e), thereby prohibiting the entry of the rest and pulses on the first output of the device. In this case, the second element 2 and 9 is open and the remaining pulses of the series pass to the second output of the device (Fig. 2g).

The shaper of 6 pulses is triggered by the trailing edge of the pulse; the pulse duration at the output must be greater than the duration of an individual pulse in the series (Fig. 2e). The signal from the shaper output goes to the time interval meter 5, which generates at the outputs of register 4 a code proportional to the time delay of the first pulse of the series relative to the control signal. When the code value at the outputs of register 4 corresponds to the current code value at the output of the first counter 2, the comparison element 3 is triggered (Fig. 2i), and the triggers 8 and 15 and the counter 13 are flung with their output signal

thus preparing the device to receive the next series of pulses.

Thus, the selection of the expected time of arrival of the next series of pulses is made. All random interference signals outside this range are selected. When the number of pulses of a series deviates from a given one, and also when the time of arrival of the control signal coincides with the processed pulse series, the signal allowing the input pulse train to pass through the input of the element 21Л 10 is not generated. That excludes the selection and selection of any other, except the first impulse of the series. Thus, an increase in the noise immunity of the device is provided.

The proposed technical solution allows to increase the noise immunity of the device by rejecting sequences in which the number of pulses differs from the specified one, and also make a decision about the shift of the control signal in phase when it coincides with the input pulse train.

Claims (1)

Claims of Invention A device for isolating and subtracting a first pulse from a series according to the author. St. No. 1275655, characterized in that, in order to improve the noise immunity, serially connected delay elements are connected between the input bus and the second input of the first element I; the third element 1/1, as well as the second pulse counter with a signal decoder connected to its outputs, the second asynchronous trigger and the fourth And element, the first input of which is connected to the input of the delay element, the second input to the forward output of the second asynchronous trigger, and a numeric input which is combined with the zero input of the second pulse counter and the output of the comparison code element, and the single inputs with the control bus of the device, the output of the fourth element I is connected to the clock input of the second pulse counter, and the output The encoder is connected to the second input of the third element I. F & g 3