SU1363201A1 - Random-pulse generator - Google Patents

Abstract

The invention relates to a pulse technique and provides a sequence of pulses, the phase of which is distributed over the normal range. The task is solved by counting a predetermined number of pulses of a random sequence that appears with a given probability P in. fixed regular times. The purpose of the invention is to expand the functionality of the generator by shifting random pulses relative to the regular sequence by a random value distributed according to a normal law. The generator contains a controlled generator of random sequences of codes 1 with two outputs, the pulses of the regular sequence of which are fed to the first counter 2, and the pulses of a random sequence through the element 4 to the second counter 5, the output pulse of which is separated by a random time interval having a normal distribution relative to the output impulse of counter 2. Element I 4 is opened by trigger 3 at the moment when the output impulse of counter 2 appears and closes at the instant of overflow of counter 5, which axis is carried out by the output pulse of the counter 2. 2 Il. Oo 05 w

Description

 one

This invention relates to computing and can be used in probabilistic modeling.

The purpose of the invention is to expand the functionality of the generator by shifting random pulses relative to the regular sequence by a random value distributed according to a normal law.

FIG. 1 shows a block diagram of a generator; in fig. 2 - time diagrams illustrating his work

The generator contains the primary source I random pulse sequences, counter 2, trigger 3, element 4, and counter 5. The generator works as follows.

The source 1 of random sequences forms two sequences of pulses: a regular sequence of clock pulses of output 1 (Fig. 2, chart 1) and a random sequence from output 2 (Fig, 2, chart 2), the pulses of which appear simultaneously with the clock pulses. The probability P of the occurrence of pulses of a random sequence can be set in the range from 0 to 1.

The clock pulses, following with the period Tr, are fed to the input of the first counter 2, whose capacitance K determines the period T of the regular sequence of reference pulses (Fig. 2, Diagram 3).

The reference pulse from the output of counter 2 resets the contents of counter 5, and sets in one state trigger 3, which then opens element 4 on the second input. The pulses of a random sequence from the output of source 1 enter the input of counter 5 until it is filled ( Fig. 2, chart 5). The output impulse of the counter 5 (Fig. 2, diagram 6) triggers the trigger 3 to the zero state, which results in closing the AND 4 element at the second input.

The distribution of the random number N clock cycles of source 1, necessary to fill the counter 5, with a sufficiently large capacity n is close to the normal distribution with an average value (mathematical expectation)

uh

,one

N1)

and variance

n (l-p) pt-

(2)

At

Where

- counter capacity 5; P - Neutrality of the appearance of a pulse at the BTOjpOM output of source 1 in one cycle of its operation. Consequently, the time interval from the moment the element 4 is opened by trigger 3 until the moment counter 5 overflows will also obey the normal law with parameters

ut

T, n

 T p

(3)

- t C-P)

- lt 5

(four)

35

40

25

thirty

45

where T is the period of the following clock pulses of source 1.

Chart 4 (FIG. 2) shows the change in voltage at the output. Trigger 3, The pulses of this voltage are the pulses of the temporary gate for element 4. In FIG. 2 timing diagrams explaining the operation of the random pulse generator were constructed with the initial data: K 20; p 4; P 0.5

Thus, the phase of the code pulse of the counter 5 has a normal distribution relative to the output pulse of the counter 2. The parameters of this normal distribution are set in accordance with formulas (1) - (4) by selecting the parameters of the device elements: the capacitors Kip of counters 2 and 5, the probability P of occurrence pulse at the second output of source 1 in one cycle of its operation.

Claims (1)

Invention Formula A random pulse generator containing a primary source of random pulse sequences, the first output of which is connected to the counting input of the first counter, a second counter, characterized in that, in order to expand the functionality of the generator by shifting the random pulses relative to the regular sequence to a random variable distributed according to the normal law, the generator additionally contains trigger-j-pulses and is connected to zero input the hero and the element, the first and second inputs of which are connected respectively with the second output of the primary source of random pulse sequences and with a single trigger output, Q and the output of the AND element are connected to the trigger trigger, the output of the counter of the first-order counter is the output of a deterministic pulse sequence and is connected to a single input trigger and with the input of the second counter. The second input of the second counter, the overflow output of which is the output of a random imrigger sequence, the overflow output of the first counter is the output of a deterministic pulse sequence and is connected to the single trigger input and to the second counter input.