SU1714597A1 - Random-process generator - Google Patents

Abstract

The invention relates to computing and can be used in the study of systems, taking into account the effects on them of random external influences, in the construction of stochastic computing and modeling devices, as well as in the construction of automated test complexes. The purpose of the image is to expand the field of application by forming signals with random forms. In the generator, a stream of pulsed signals is formed, in which with given (controlled) probabilities appear pulsed signals of any required forms (from a pre-selected set of programmable forms), and the parameters of the individual are ~ 1 ~

Description

The invention relates to computing and can be used in the study of systems, taking into account the effects on them of random external influences, in the construction of stochastic computing and modeling devices, as well as in the construction of automated test complexes.

The aim of the invention is to expand the field of application of the generator by allowing the formation of a sequence of pulse signals with random parameters and random waveforms selected from a certain (pre-prepared) set of forms. The set of pulse shapes can be arbitrary, each form is programmable and the probability of selecting each form is controllable.

SUMMARY OF THE INVENTION The essence of the invention is that in a random process generator it is possible to generate a stream of pulsed signals in which pulses of any desired shape (from a predetermined set of forms) and parameters of individual signals appear (with a predetermined probability). the amplitude, base duration, polarity, the interval between adjacent signals) can be both random and deterministic values (in arbitrary combinations), and random parameters can be subordinate any required probability distribution functions. This allows us to significantly expand the class of random processes being formed and. in particular, to form random processes with polymodal power spectral density functions and to approximate various real external factors by random pulse processes.

The formation of random impulse streams with a large number of controllable signal parameters and with randomly selected forms is achieved due to the fact that ordinate codes of single impulse signals of various desired forms are stored in a memory block divided into zones, each of which corresponds to a certain form of a pulse signal. . Using the additionally introduced random number generator, which generates random codes subject to the required probability distribution functions, the memory area corresponding to a certain form is accessed, resulting in a signal of the selected form with the specified mi

The drawing shows a flowchart of a random process generator,

The random process generator contains the first 1 and second 2 random sensors

numbers, element 3, trigger 4, switch 5, first b and second 7 blocks of division, generator 8 of pulses, block 9 of formation of time parameters, counter 10, block 11 of memory, block 12 of multiplication, digital-analog converter 13 and modulator 14 .

The first sensor of Gluseyn numbers is designed to form groups of codes that determine the values of random parameters (amplitude A, pulse base duration g and pause T), the current pulse generated, and the most significant bit of the code determining the amplitude of the signal is an indication of polarity.

The second random number sensor 2 is designed to form a code determining the number of the current pulse form from a given set of shapes stored in the memory block 11 in the form of a code pulse of single pulse signals.

5 Element And 3 is intended to form a polling signal for sensors 1 and 2 of random numbers that occurs when the formation of a pause between pulses is completed.

0 Trigger 4 is designed to generate control signals that allow operation of memory block 11 and determine the stages of forming the actual pulse signal (trigger in one state)

5 or pauses between adjacent signals (trigger in zero state).

The switch 5 is intended to organize the connection to the information inputs of the second block 7 for dividing the frequency of the codes from the second or third outputs of the sensor 1 of random numbers that determine the durations of the bases of the current pulse or pause between adjacent signals. The first frequency division unit 6 ensures the formation of a reference pulse train with a certain frequency in accordance with the time scales during the formation of pulses or pauses between them.

0 The second frequency division unit 7 is designed to set the speed of filling the counter 10 with clock pulses in accordance with the values of random codes received from the output of the switch 5 and determining the values of signal durations and pauses between pulses.

The pulse generator 8 generates a clock pulse sequence for synchronizing and controlling the operation of the proposed generator.

The time parameter generating unit 9 is intended for storing and issuing codes defining the time scales of pulse durations and pauses between adjacent signals for different pulse shapes.

The counter 10 is used to form a sequence of addresses at which information is read from the memory block 11.

The memory unit 11 is designed to store the ordinate codes of single pulse signals of various desired forms.

Multiplication unit 12 is used to generate credits defining the current process values by multiplying the ordinate codes of the single pulses by the random codes of the amplitudes of the current pulses.

The digital-to-analog converter 13 is designed to convert into an analog signal a sequence of codes defining the current values of the generated process.

A polarity modulator 14 converts a sequence of pulses of constant polarity, coming from a digital-to-analog converter 13, into a sequence of signals with a predetermined (different) random polarity. The generator of a random process works as follows.

Each cycle starts with the second sensor generating 2 random numbers of the code of the current (generated) pulse shape number, this code is controlling for generating 1 random numbers of code groups determining the values of random parameters (amplitude, duration and pause between pulses) of the current signal The values of the pulse parameters are formed according to the (controlled) distribution laws specified for each pulse shape. When forming the pulse duration, trigger 4 is in a single state. The permissive signal from the direct output of the trigger 4 is fed to the control input of the memory block 11 and enables it to work. This signal is fed to the control input of the switch 5, which provides the information input of the second frequency division unit 7 with a code defining the value of the current pulse duration. Further, the signal arrives at the lower bit of the input of the time parameter formation unit 9 and permits reading of information from the area of the memory unit 11 in which the codes defining the time scales of the pulse duration are recorded.

At the output of the second sensor 2 random numbers, a code is fixed that determines the type number (form) of the current pulse. This code enters the input of the first random number sensor 1 and allows the generation of codes of random parameters (amplitude, pulse base duration, pause between pulses) of the corresponding type (shape) of a pulse signal, with the higher bit of the amplitude code indicating the polarity of the generated pulse.

The code from the output of the second sensor 2 random numbers also goes to one of the address inputs of the memory unit 11, allowing the reading of information from the zone corresponding to the selected type (shape) of the pulse.

The code of the pulse shape number is fed to the input of the variable parameters generating unit 9, from the output of which the time scale code of the current pulse duration of the corresponding form is read. The time scale code of the signal duration is fed to the control input of the first frequency dividing unit 6, to the input of which a clock sequence of pulses is supplied from the output of the generator of 8 pulses.

At the output of the first block of frequency division 6, a sequence of pulses is formed with 4acTOTOvi inversely proportional to the code of the pulse duration time scale. This sequence of pulses is fed to the input of the second frequency division unit 7, to the control input of which the output of switch 5 receives code 1 (determining the duration of the current pulse. Thus, a sequence of pulses is formed at the output of the second frequency division unit 7, the intervals between which are proportional to the time scale code of the pulse duration and the random code of the duration of the current pulse. This sequence arriving at the counting input of the counter 10 ensures the generation of addresses with the required frequency. Thus the formation provided mpulsa duration.

r tr-kMr-kr-2

where trb is the clock interval between pulses generated by the generator of 8 pulses:

KmT - scale code duration;

Kg is the random code of the pulse duration;

m is the counter size of the address 10.

Next, the sequence of codes from the output of the counter 10 is fed to the address

the input of the memory block 11, at the output of which a sequence of codes of ordinates of the pulse of the corresponding form is generated. These codes go to the first input of multiplication unit 12, to the second input of which, from the output of the random number sensor T, a code is received that determines the magnitude of the amplitude of the current pulse. Thus, the output of multiplication unit 12 generates a sequence of codes defining the shape of the corresponding pulse with a given amplitude, which is fed to the input of the digital-to-analog converter 13. At the output of the latter, a sequence of pulses is formed, which is a required process . The pulse process from the output of the digital-analog converter 13 is fed to the information input of the modulator 14, the control input of which receives the high bit of the amplitude code, the value of which (O or 1) determines the polarity of the current (generated) signal at the output of the modulator 14. Thus Thus, at the output of the modulator 14 (which is the output of the proposed random process generator), the signal flow with the required amplitudes, durations and fields is generated.

When the counter reaches 10 maximum output is overflow-. This counter appears a signal that is fed to the input of the trigger 4 and on the trailing edge translates it into the opposite state. This signal arrives at the first input of the AND 3 element, but does not pass to its output, since before the end of the signal at the second input of the AND 3 element there is a inhibitory signal.

The inhibit signal from the output of trigger 4 is fed to the control input of memory block 11 and prohibits the reading of information. This signal, the passage to the control input of the switch 5, provides for the input to the input of the second frequency division unit 7 a code determining the duration of the pause of the generated pulse signal. The signal from the output of the trigger 4 is fed to the lower bit of the input of the time parameter formation unit 9 and permits reading of the code defining the time scale of the pause duration. Thus, the state of the trigger 4 determines the phase of the formation of the pulse duration or pause between adjacent pulses.

The code from the output of the temporal parameterization unit 9 is supplied to the control input of the first frequency division unit 6, the output of which is formed

a sequence of pulses with a frequency inversely proportional to the code KMT -scale of the duration of the pause between pulses. This sequence is fed to the input of the second frequency division unit 7, the control input of which from the output of the switch 5 receives the code determining the duration of the pause. Thus, at the output of the second block 7 division

0 frequency, a sequence of pulses is formed, the intervals between which are proportional to the kt code of the time scale of the pause length multiplied by the random pause code of each current pulse. This sequence, entering the input of the counter 10, ensures the formation of addresses with the required frequency. Thus, the formation of a pause is ensured.

0T trkMTkT-2,

where the clock interval between pulses, given by the generator of 8 pulses: kMT code of the pause duration scale;

 random pause length code;

m is the counter size of the address 10. J When counter 10 reaches its maximum value (2), a signal is generated at its output, which is fed to the input

0 trigger 4 and translates it on the falling front in the opposite (single) state. This signal passes to the output of zlemeita And 3 and, arriving at the inputs of the assignment of the values of random parameters of the first 1

5 and the second 2 random number sensors, resolves the next step of forming the current pulse (with the required amplitude, pulse base duration and pause). At the output of the second sensor

0 2 random numbers are generated, a code corresponding to the new type number (form) of the pulse, and the signal generation process is repeated.

The proposed generator allows

5 to form a sequence of pulse signals of arbitrary programmable forms with random, distributed in accordance with the required laws, the values of the amplitudes A, durations

0 bases and intervals between adjacent pulses.

Claims (1)

Invention A random process generator comprising a digital-to-analog converter, 5 multiplication unit, a counter, a first random number sensor, a switch, a trigger, a pulse reViever, a memory block, two frequency division blocks and a modulator, the output of which is the generator output, the output of the warmer of pulses is connected to the input the first frequency dividing unit, the output of which is connected to the input of the second frequency dividing unit, the output of which is connected to the counter input of the counter, the forward output of the trigger is connected to the read control input of the memory unit, the output of which is connected to the first input of the multiplication unit, whose output is through a digital-to-analog converter connected to the information input of the modulator, o and t and n and so that, in order to expand the field of application of the generator by generating signals with co-forms, the generator contains t I. block the formation of time parameters and the second sensor random. the output of which is connected to the input of setting the values of random parameters of the first random number sensor, with the higher bits of the input of the block for forming time parameters and with the higher bits of the address of the memory block, the lower ones the bits of which are connected to the information output of the counter, the overflow output of which is connected to the first input of the AND element and to the zero input of the trigger. the inverse output of which is connected to the second input of the element I, the output of which is connected to the trigger input of the second and first sensors of random numbers, the first output of which is connected to the second input of the block multiplying and to the control input of the modulator, the direct output of the trigger is connected to the input of the amp & time while the time parameters and to the controlling input of the switch, information1; 1nt (the output of which) is connected to the BTepOfyty and the third outputs nepsro random number sensor, the output of the switch is connected to the control input of the second frequency division unit, the output of the forming unit time parameters are connected to the control input of the first frequency division block.