SU1506572A1 - Simulator of telegraph signals - Google Patents

Abstract

The invention relates to radio engineering and can be used as an integral part of test equipment for telegraph measurements. The purpose of the invention is to expand the functionality by forming telegraph signals with predetermined multiplicity ratios of parcels. The simulator contains a shaper 1 reset pulses, trigger 3, element OR 7, switch 8, block 9 frequency dividers, block 10 elements AND, element AND 11. Introduction of pseudo-random numbers to comparative device 2, comparator 4 codes of numbers, block 5 keys, the trigger 6 and the corresponding links ensure stable values of the probability of the occurrence of parcels of various multiplicities during operation and the receipt of telegraph signals with predetermined multiplicity ratios of the parcels. 1 il.

Description

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The invention relates to radio engineering and can be used as an integral part of test equipment for telegraph measurements.

The purpose of the invention is to expand the functionality by forming telegraph signals with predetermined multiplicity ratios of parcels.

The drawing shows a structural electrical circuit of the proposed simulator.

Telegraph signal simulator contains shaper 1 reset pulses, 2 pseudo-random number generator, first trigger 3, comparator 4 number codes, 3 key block, second trigger 6, OR element 7, switch 8, frequency divider block 9, And element block 10 eleven.

The simulator telegraph signals works as follows.

The telegraph signal simulator operates in two modes: the mode of forming telegraph signals with the necessary probability of the occurrence of parcels of various multiplicity and in the mode of obtaining telegraph signals with the specified ratios of dressing multiplications.

In the first mode, the simulator works as follows.

The control input of the switch 8 is given a signal that ensures switching of the switch 8 in such a way that a signal passes from its output only from its first input. At the programming inputs of the comparator 4 codes of numbers, codes of numbers a, b, c are supplied with which the numbers supplied to its second input must be compared in comparator 4. If the number supplied to its second input turns out to be less than the code of the number a, then the signal is received on the first link connecting the output of the comparator 4 number codes to the first input of the switch 8. If the number supplied to its second input turns out to be in the range a, b, the signal is wired on the second link connecting the output of comparator 4 to the first input of switch 8, and so on. On each front of the output parcel of the simulator, the driver 1 reset pulses produces a pulse that resets the frequency block dividers to zero and causes the formation of

the next number in the generator -2 pseudo-random numbers. The operation of the simulator is considered by the example of the formation of telegraph signals (parcels) with multiplicity of 1-4 with probabilities of occurrence of P, P, P 4, respectively.

The pseudorandom number generator 2 generates numbers distributed according to a law close to the law of uniform density in a certain range in (, l). The comparator 4 number codes are supplied with boundary values of a, b and c. These values are chosen according to the required formation probabilities parcels of various multiplicities P,, P, P- and P so that the ratios

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So y, if the random number r generated by the generator of 2 pseudo-random numbers falls in the range (a, 0, then the probability of such an event will be equal to P. If in the range b, aj, then P, etc. Therefore, The occurrences of the control signals at the output of the comparator 4 number codes, as well as the signals at the output of the switch 8, will correspond to the required values.

Thus, after forming in the generator 2 pseudo-random numbers of the next number Vf, the output signals of the switch 8, arriving at the element And 11 and at the n elements And block

10, open one of them. Element And 11 transmits to its output a signal with a clock frequency f,. First ele. ment And the block of 10 elements And - with frequency,. / 2, the second element And block of 10 elements And - with frequency, the third element And block of 10 elements And - with frequency. Therefore, the probability of occurrence of frequencies f, f, / 2, f, / 3

and g t / 4 at the output of the element OR 7 and, respectively, at the input of the first trigger 3 will be respectively P, P, P, and P, and therefore, with such likelihood, the first trigger 3 will form the premisses of the required multiplicity. And since the numbers generated by the generator

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2 pseudo-random numbers are pseudo-random, then the pseudo-random will be the alternation of multiples generated by the device parcels,

In the second mode, the simulator works as follows.

The control input of the switch 8 is given a signal that ensures the switching of the switch 8 in such a way, IQ that a signal passes from its output only from its second input.

The control inputs of the key block 5 receive the signals necessary to receive telegraph signals with predetermined ratios of 1: 1; 1: 2; 1: 3; 1: 4; 1: 5; 2: 2 and 2: 3.

The operation of the simulator is considered by the example of forming a telegraph signal with a given ratio of spreading 1: 1.

If there is a signal at the corresponding control input of the 5 key block and a signal at the first control input of the 5 key block, the signal on the first communication line connecting the output of the 5 key block to the second input of the switch 8 will occur. If there is a signal at the second control input of the block 5 the keys signal is again on the first communication line connecting the output of the key block 5 to the second input of the switch 8. Therefore, regardless of the control signals on the first or second inputs of the key block 5, the output signal of the key block 5 will be present The first communication line connecting the output of the 5 key block to the second input of the switch 8. Accordingly, regardless of the control signals on the first or second input of the 5 key keys, only one And 11 element will constantly be open, which causes the output signal to fk frequency f. This signal is roted through the element OR 7, is put on the counting input of the first trigger and on each pulse, the next one with the frequency f, the first trigger 3 is moved, forming at its output a pulse with a multiplicity of 1: 1 with a duration of G 1 / f. At each output terminal of the device, the reset 1 1 pulse puller generates a pulse that resets the zero frequency dividers of block 9 and switches the second trigger 6.

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second trigger 6 in this case will be formed posyak with multiplicity of 1: 1.

The operation of a tmiter is considered by the example of forming a telegraph signal with a given parity ratio of 1: 2.

If there is a signal at the corresponding control input of the key block 5 and a signal at the first control input of the key block 5, a signal is sent on the first communication line connecting the output of the key block 5 to the second switch input.

Accordingly, a signal appears on the first link connecting the output of the switch 8 with the element 11, which passes a signal with a clock frequency f to its output. This signal passes through the element OR 7, enters the counting input of the first trigger 3; The first trigger 3 is re-allocated to form a parcel with a duration of 1 / f at its output.

If there is a signal at the second control input of the key block 5, the signal is wired on the second communication line connecting the output of the key block 5 to the second input of the switch 8. Accordingly, a signal appears on the second communication line connecting the output of the switch 8 with the first element And block 10 elements I. The first element And block 10 elements And passes to its output a signal with a clock frequency of t- / 2. This signal passes through the element OR 7 and enters n. the counting input of the first trigger 3; The first trigger 3 is transferred, forming a parcel with a duration of 1 2 / f at its output. On each front of the output parcel of the simulator, a shaper of 1 5 reset pulses produces a pulse, dropping to zero the frequency dividers of block 9 and switching | The second trigger 6. Thus, in the presence of a signal at the first control input of the key block 5, at the output of the first flip-flop 3, parcels of duration l / f are formed. When the signal appears at the second control input of the key block 5 of the first flip-flop 3, parcels of duration 0 2 / f, which ensures the formation of uninterruptedly following parcels of polos30

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However, regardless of the state of this positive and negative polarity

with multiplicity 1: 2. Similarly, the formation of packages with other specified ratios of multiplicities

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Claims (1)

Invention Formula A telegraphic signal simulator containing an OR element connected in series, a first trigger and a reset pulse shaper, the output of which is connected to the installation inputs of the frequency divider unit, the counting inputs and outputs of which are connected respectively to the first input of the element I, whose second input. one output of the switch is connected, and with one input of the block of elements AND, the other inputs and outputs of which are connected respectively with the other outputs of the switch and with one input of the element OR, to the other input of which An output of the element I is connected, characterized in that, in order to expand the functionality by generating telegraphic signals with given ratios of multiplications of dressing, a key block, a pseudo-random number generator, a second trigger and a comparator of number codes, the inputs and outputs of which are connected respectively, are entered outputs of a pseudo-random number generator and one of the inputs of the switch, to the other inputs of which are connected the outputs of the key block, the inputs of which are connected to the outputs of the second trigger, whose input is soy Inonii to an input random number generator and the output of the reset pulse.