SU634327A1 - Random signal generator - Google Patents

Description

one

The invention relates to the field of computing and can be used to simulate random processes.

A random signal generator is known comprising a source of noise, AND elements, a control unit, and an adder. In this generator, the law of the distribution of the output voltage levels is discrete, therefore, the accuracy of the uniform distribution modeling is limited to its dependence due to the large hardware costs.

Another known random signal generator comprises an input unit, a random number sensor, a clock pulse generator, an intermediate memory register and a code-voltage converter. The law of distribution of the output random voltage levels for this generator is also discrete and, therefore, it has the same disadvantages as discussed above. 2.

The closest to the technical solution of this invention is a random signal generator containing a source of noise, the output of which is connected

to the first input of the first one-shot, the second input of which is connected to the output of the clock pulse generator and to the first input of the level discriminator (3}.

The disadvantage of such a generator is the low accuracy of approximation to a uniform distribution.

The aim of the invention is to improve the accuracy of the generator.

To achieve this goal, the generator contains an adder and a second one-shot, the input of which is connected to the output of the level discriminator, and an output - to the subtractive input of the adder, the summing input of which is connected to the output of the first oscillator, and the output is the output of the generator and connected to the second input of the level discriminator.

The random signal generator (Fig. 1) contains a noise source 1, the output of which is connected to the input of the one-oscillator 2. The second input of the one-oscillator 2 is connected to the output of the clock pulse generator 3. The summing and subtracting inputs of the adder 4 are connected to the outputs of the one-oscillator 2 and 5, respectively. 4, which is also the output of the random signal generator, is connected to the input of the discriminator of levels 6, the output of which is connected to the input of the one-vibrator 5, and the control input is connected to the output of the clock generator 3.

FIG. 2 shows the timing diagram of the generator, showing:

a — voltage pulses at the output of the clock pulse generator 3;

b - pulse flow at the output of the one-shot 2;

c — voltage pulses at the output of the one-shot 5;

d is the voltage at the output of the random signal generator.

The generator works as follows. The clock pulse generator 3 generates voltage pulses with a constant duration and with a deterministic, predetermined follow-up period (Fig. 2, a). These pulses arrive at the control inputs of the one-shot 2 and the gated discriminator of levels 6. The rising edge of these pulses triggers the one-shot 2, and the trailing edge is the strobe signal for polling the gated level discriminator 6. After each start, the one-shot 2 produces a pulse of random activity (FIG. 2,6). The pulse duration of the one-shot 2 is determined by the random moment of its reverse response, i.e. the moment of reaching the total voltage Uy LJ {t) 4-C ,, .. is the inverse response level, where U (t) is the voltage lia time of the master element of the one-oscillator 2, IJ.U is the voltage at the output of the source uiyMci 1 supplied to one-shot 2.

The pulses of random duration from the output of the one-shot 2 are fed to the summing input of the adder 4, which linearly converts the length 1os and these pulses to a voltage with after which the voltage on the charging element is memorized. Consequently, the voltage at the output of the adder 4 is a stepwise increasing function of time, and the increments of the voltage between the levels are random variables, subject to the same distribution law as the duration of the pulses of the one-vibrator 2. At P1), the output voltage of the adder 4 a predetermined level of E, after the arrival of the next strobe signal from the clock generator, the gated discriminator 6 is activated and generates a trigger signal at the input of the one-oscillator 5. The latter generates the pulse (Fig. 2, c) that goes to the subtracting input of the adder 4. After the pulse from the one-vibrator 5 in the adder 4, a predetermined voltage from the accumulated random voltage is extracted from the accumulated random voltage, and E . 2, d), after which the cycle

the accumulation of voltage at adder 4 continues by analogy with the above.

The mode of operation of the random signal generator provides conditions under which the time intervals at the output of the one-shot 2 and, therefore, the increments of the output voltage of the adder 4 are independent, equally distributed, random values. Under these conditions, the operation of the proposed generator as a whole proceeds according to the known models of the theory of restoration. Indeed, the levels of the output voltage of the generator (Fig. 2, d) on the voltage axis form a random flow with a limited aftereffect and with the variance accumulator of the appearance of a random voltage level. Moreover, these levels along the voltage axis are spaced apart at random voltage intervals, all but the first having the same distribution. As follows from the generator operating mode described above, as well as from the output voltage plot (Fig. 2, d), the distribution density of the first random voltage interval A Ui is equal, where F (x) is the distribution function of random intervals A Uj, A Ыз , ..., and c,.

Consequently, the functioning algorithms of the proposed generator correspond to the well-known model of the stationary recovery process, considered on the voltage axis. In the installable mode of operation for such a model, the expectation .Nea of the number of voltage levels placed in the interval of the width of the width of the ba does not depend on the location of this interval on the axis of the voltage, and the quantity .. is a linear function of the width of the interval of bi .

Thus, for the proposed generator, the probability of occurrence of a random level of its output voltage in an elementary voltage interval is bi-constant over the whole range of generated levels E. Consequently, random levels of the output voltage of the proposed generator: my generator follows the law of uniform density, and their distribution is continuous in a given interval E, since the random time intervals generated by the one-vibrator 2 also have a continuous distribution law.

Due to the continuity of the distribution law of random levels of the output voltage, the accuracy of approaching the uniform distribution of random levels in the proposed generator depends on the value. on the number of generator operation cycles, i.e. the levels of the output voltage of the generator are subject to the distribution law unboundedly approaching uniform.

The random signal generator can be used as an auxiliary signal generator in devices operating on the principle of stochastic quantization. In this case, the continuous nature of the distribution law of the output random voltage of the generator makes it possible to significantly increase the accuracy of the stochastic transformation.

Claims (3)

1. Bobnev MP, Generation of Random Signals, .M., “Energia I, 971, p. 75-80. 2. Authors certificate of the USSR 227402, cl. G 06 F 1/02, 1967. 3. Bobnev MP, Generation of random signals, M., “Eneogi. 197, p. 147.