SU1005042A1 - Random pulse burst generator - Google Patents

Description

The invention relates to computing and can be used in the simulation of random processes in real scale.

A device for making is known. random pulse ki, generating, pulse sequence of random duration, containing the noise source, amplifier, threshold element l.

However, when simulating communication channels to simulate errors and interference, bursts of pulses with a low probability of occurrence and random duration are needed.

The closest to the invention is a generator of bursts of random pulses containing a source of noise, an amplifier, a delay line, elements And, triggers t23

The disadvantage of this generator is its complexity.

The purpose of the invention is to simplify the generator.

To achieve this goal, a generator of bursts of random pulses containing a noise source, the output of which is connected to the line input through a broadband amplifier.

delays and the first input of the first element I, the IK-trigger whose output is connected to the first input of the second element And, the first output of the delay line is connected to the first input of the first element And, the counting trigger, the third and fourth elements And, and two differentiating circuits whose outputs are connected respectively

10 with I and Cg inputs of 1K-flip-flop, the second and third outputs of the delay line are connected respectively to the first inputs of the third and fourth elements, And, the outputs of which are connected

15, respectively, with the inputs of the first and second differentiating circuits, the output of the first element I is connected to the counting input of the counting trigger and to the second input of the third element I,

The output of which is connected to the second input of the fourth element I, the output of the counting trigger is connected to the second input of the second element I, the output of which is the generator output.

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FIG. 1 shows a functional diagram of the generator; in fig. 2 is a temporary chart of his work.

The generator contains a source of 1 noise, a broadband amplifier 2, 30 And 3, the line 4 delay.

counting trigger 5, element And 6, element And 7, differentiated circuit 8, IK-trigger 9, element And 10, differentiating chain 11.

The generator works as follows.

The noise voltage from noise source 1 through broadband amplifier 2 with adjustable trigger threshold (the threshold threshold determines the output frequency of the output signals to one input of an And 3 element, and through line 4 of the delay to another input of the And 3 input. shifted random bursts of noise voltage of the same polarity and sufficient amplitude at both inputs of the element And 3 are small, therefore the frequency of occurrence of random noise pulses at its output is several orders of magnitude less than The frequency of occurrence of pulses at the outputs of elements And 7 and 10 is even smaller, since at one of their inputs there is a discharged signal from the output of the previous element I. A trigger 5 with a counting input converts the consistency of random bursts of noise voltage into a random sequence of pulses, having a random duration, i.e., into a sequence of anisochronic pulses, which with the help of the second element And 6 is formed into random packs and fed to the output of the device; The second element is controlled And the IK realizes rum 9, the I and K inputs of which through the differentiating chains 8 and 11 receive pulses, respectively, from the outputs of the elements and 7 (determine the time of the beginning of the pack) and I 10 (determine the moment of waking of the pack).

Since the simultaneous occurrence of pulses is possible when the device operates on both inputs of trigger 9, a trigger of type 1-K is used as trigger 9, which has no state of uncertainty, and for this trigger to trigger on the leading edges of the control pulses (i.e. , so that its operation was not affected by the difference in pulse durations), differentiating chains 8 and 11 are connected to both inputs of trigger 9.

Compared to the prototype, there are no complex threshold elements in the device and it is easily implemented on discrete chips. Thus, the device allows generating the output signal in the form of bursts of anisochronous pulses, with the help of which it is possible to simulate random processes in real time (for example, various interferences and errors in communication channels.

Claims (2)

1. Bobnev M.P. Generation of random pulses. M., Energie, 1971. 2. Authors certificate of the USSR 517888, cl. G 06 F 7/58, 1975 (prototype). i | iiiiliiiii | iiiii five 1 I iiiiiiiiiiiiiiiiiiiiiiiiiiiii