SU1157670A1 - Device for detecting pulse loss - Google Patents

Abstract

1. A DEVICE FOR DETECTING A LOSS OF A PULSE, containing the first element AND, the delay element n the inverter, as well as the serially connected pulse sequence regenerator and the second element AND, the inverter input is combined with the first input of the regenerator and is the input of the device, and its output is connected to the second input of the second element I, the output of which is in / out by the first output of the device, characterized in that, in order to increase the reliability of detection of the loss of pulses, serially connected between the input and The second output of the device is the OR element, the first element AND, the pulse counter and the decoder, the output of which is connected to the second input of the OR element, the output of the second element AND is connected to the second input of the pulse sequence regenerator, and the output of the pulse sequence regenerator is connected through the delay element the second input of the first element I. 2. The device according to claim 1, characterized in that the regenerator of the pulse sequence is made as a series of connected elements OR, element coagulant shaper and delay, the inputs of the OR gate are inputs regenerator pulse sequence, and an output of its output.

Description

1 The invention relates to a pulse technique and can be used in information processing devices. A device is known comprising a series-connected quasi-selector, an And element and an RS flip-flop, as well as a delay element, the input of which is combined with the input of the quasi-selector and connected to the input of the device as well. the output is connected to the input of the gear whose output is connected to the second input of the element AND Q. A disadvantage of this device is the low reliability of detecting the loss of pulses, since the device does not work correctly when a sequence of two or more consecutive pulses is lost and only generates a signal only about the first lost pulse. The closest to the invention to the technical essence is a device for detecting a loss of a pulse, comprising a first AND element, a delay element and an inverter, as well as a serially connected pulse sequence regenerator, a second AND element, the inverter input combined with the first input of the regenerator and and the output is connected to the second input of the second element AND, the output of which is the first output of device I. A disadvantage of the known device is that no third is formed at its output and subsequent lost additional input pulses. This leads to a decrease in the reliability of detecting the loss of a pulse. The aim of the invention is to improve the reliability of detecting the loss of pulses. This goal is achieved in that the device for detecting the loss of a pulse, containing the first element AND, the delay element and the inverter, as well as the serially connected pulse sequence regenerator and the second element AND, the inverter input is combined with the first input of the regenerator and and its output is connected to the second, the input of the second element, AND, the output of which is the first output of the device, is introduced in series between the input and the second output of the device, element 0 OR, the first element t I, the pulse counter and the decoder, the output of which is connected to the second input of the OR element, the output of the second element AND is connected to the second input of the pulse sequence regenerator and to the counting input of the counter, the output of the pulse sequence regenerator is connected to the second input of the first element I. Regenerator the pulse sequence of the connecting elements OR, the delay element and the driver, and the inputs of the OR element are the inputs of the pulse sequence regenerator, and the output forms rova bodies - its output. FIG. 1 shows a structural electrical circuit of the device; FIG. 2 and 3 - time diagrams of his work; in fig. 4 is a structural electrical circuit of the pulse sequence regenerator. The device for detecting the loss of a pulse contains the first element AND 1, the delay element 2 and the inverter 3, as well as the series-connected regenerator 4 of the pulse sequence and the second element 5. The input of the inverter 3 is combined with the first input of the regenerator 4 and is the device input 6, and the output is connected with the second input of the second element AND 5, the output of which is the first output of the device 7, and the OR element 9, the first element 1 AND, the counter 10 pulses and the decipher, are connected in series between the input 6 and the second output 8 of the device op 11, the output of which is connected to the second input of the element OR 9, the output of the second element And 5 is connected to the second input of the regenerator 4 of the pulse sequence and to the counting input of the counter 10, the output of the regenerator 4 of the pulse sequence through the delay element 2 is connected to the second input of the first element And 1 The pulse sequence regenerator 4 is made in the form of serially connected elements OR 12, delay element 13 and shaper 14, and the inputs of the element OR 12 are the inputs of the pulse sequence regenerator 4 nosti and output shaper 14 - its output.

31

The device works as follows

In the initial state, zero is recorded in the counter 10. The pulses arriving at device 6 (figure 2 y) close element 5 on the second input (figure 2e) with a logical zero coming from the output of the inverter 3. In the event of a loss of a pulse in the pulse sequence to the device 6 input (FIG. 2cL lost pulses are shown by a dotted line), And 5 opens on the second input and at the time corresponding to the lost pulse, a pulse formed by the regenerator 4 appears at its output (Fig. 2d). This pulse arrives at output 7 devices to the second input of the regenerator 4 and n the counter input of counter 10. Thus, at the output 7 of the device, pulses appear, coinciding in time with the lost pulses from the pulse sequence input to the device 6. These pulses are counted by counter 10 and if their number reaches the maximum allowable number N, On the output of the decoder 11 and on the output 8 of the device Kfig. 2s), a pulse is generated signaling this. At the same time, this pulse goes through the OR 9 element to the AND 1 element (Fig. 2i), on which this pulse is strobed by the output pulse of the regenerator 4 delayed by the delay element 2 (Fig. 2A). The pulse from the output of the element AND 1 (FIG. Is fed to the input R of the counter 10 and sets it to the zero state.

Thus, the device makes it possible to increase the reliability of detecting the loss of pulses by detecting a larger number N of lost orders of pulses of the input pulse;

The maximum allowable number N of lost sub-pulses of the input pulse sequence is determined by the time setting accuracy

704

delay of the delay element of the regenerator 4, the deviation of the delay time of the delay element of the regenerator 4 from the value of the period of the pulse of the input signal leads to a discrepancy in time of the pulses arriving at the inputs of the element And 5 (Fig. 3J, b) and the appearance of pulses at its output during those moments when they should not be (the first and last pulses in Fig. 3 Z-).

To increase the maximum allowable number N of lost additional pulses that can be detected by the device, and therefore, to increase the reliability of detecting the loss of impulses, for example, by running the regenerator 4 in the form of series-connected elements OR 12,

the delay element 13 and the pulse width former 14 (FIG. 4), the former 14 is triggered by the leading edge of the output pulse of the delay element 13 and forms

a pulse of such duration that its displacement in time caused by the inequality of the delay time of element 13 and the period of the pulse following in the pulse sequence,

received at the first input of the regenerator 4 during the time corresponding to the maximum permissible number lost by a number of pulses did not lead to the appearance of parasitic pulses in

moments of time corresponding to per /

vom and last pulses (fig.ZG).

Thus, due to the introduction into the composition of the regenerator and the pulse sequence of the shaper 14, the sequence of iguls at points 5 and g, (Fig, 1) have the form shown in FIG. 3, respectively.

The proposed device in comparison with the known allows to increase / reliability of detecting the loss of

pulse due to the fact that it can fix not only the first and second, but also each of the subsequent losses of other pulses, if the number of lost advanced pulses does not exceed the allowable one.

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Claims (2)

1. DEVICE FOR DETECTING A PULSE LOSS, containing the first element And, the delay element and the inverter, as well as the pulse generator and the second element And connected in series, the inverter input is combined with the first input of the regenerator and is the input of the device, and its output is connected to the second input of the second element And, the output of which is the first output of the device, characterized in that, in order to increase the reliability of detection by the loss of pulses, series-connected between the input and the second are introduced into it the output of the device is an OR element, the first And element, a pulse counter and a decoder, the output of which is connected to the second input of the OR element, the output of the second And element is connected to the second input of the pulse sequence regenerator and to the counter counting input, the output of the pulse sequence regenerator through the delay element connected to the second input of the first element I. ' 2. The device pop. 1, considering that the pulse sequence regenerator ^{s is} made in the form of series: connected OR elements, a delay element and a driver, the inputs of the OR element being the inputs of a pulse sequence regenerator, and the output of the driver is “1157670 Fig.} Its output.