SU1282349A1 - Bipulse signal receiver - Google Patents

Abstract

The invention relates to communication technology. The purpose of the invention is to increase the reliability of reception by reducing the probability of group error. The receiver contains an amplifier-limiter 1, a delay line 2, a decoder 3, rr 4 clock pulses, six AND 5-10 elements, a waiting multivibrator (LM) I1, a trigger (T) 12 and three elements OR 13, 14 and 15. If there is an error in the received bi-g pulse signal (LSI), its influence on the reception of further information is excluded. For this, the value of the next symbol is determined by the combination of pairs of pulses in the second half of the clock interval of the next LSI. As a result, the influence of the distortion of one LSI on the correct detection of the binary value of the second is eliminated. go BIS. The goal is achieved by the introduction of the elements AND 5-10, F 11, T 12 and the elements OR 13, 14 and 15. The receiver differs according to claim 2 in the form of G 4, containing two differentiating elements, T and the element OR. 1 3.p. f-ly, 2 ill. i С / С

Description

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The invention relates to communication technology and can be used in data transmission systems.

The aim of the invention is to increase the reliability of reception by reducing the likelihood of group error.

Figure 1 shows the structural electrical circuit of the proposed receiver; 2 is a structural electrical circuit of a clock generator.

The bi-pulse signal receiver contains amplifier-limiter 1, delay line 2, decoder 3, 4 clock pulse generator, the first - the sixth elements AND 5 - 10, the waiting multivibrator 11, the trigger 12, the first - the third elements OR 13 - 15.

The clock generator contains the first and second differentiating elements 16 and 17, the element OR 18 and the trigger 19.

The receiver works as follows.

The operation of the proposed receiver is based on the following properties of the bi-pulse code. If the received biopulse signal is shifted by half of the clock interval and the resulting pulse sequence is compared with the original one, then you can see that the appearance of two unit symbols in these sequences coincides with the change in the values of the transmitted binary symbols in the original sequence from the zero symbol to the unit one. The presence of two null characters coincides with the change of values and the initial sequence from one to zero. Moreover, with the receiver working correctly, these pulses coincide only in the first half of 10

the effect of distortion of one bi-pulse signal on the correct detection of the binary value of the second bi-pulse signal. The occurrence of a double or more group error in this case is not considered, since it is considered that such an error unambiguously leads either to a loss or to a recapitulation of a distorted message.

The shift of the received pulse sequence by half of the clock interval of the bi-pulse signal is performed using the delay line 2. The analysis of possible combinations of 5 pulses of the received and shifted sequences is performed with the help of the decoder 3. Formation

 two sequences of clock pulses, corresponding to the first and second half of the bi-pulse signal, is carried out using a 4 clock pulse generator. After the decoder 3 selects the moment of coincidence of two unit symbols in the first half-period using element 9, the trigger state is set to one. In the presence of two zero symbols using element 10, the trigger 12 is set to the zero state. The operation of these elements is resolved by signals from the second output of the 4-clock generator and by a high LEV1 signal. I from the inverse output of the waiting 35 multivibrator I1. When a decoder allocates 3 two single ones or

. two zero symbols in the second half-period of the bi-pulse signal using the third and fourth elements I 7 and 8, the signal from the first output of the 4 clock pulses is started, the idle multivibrator 1I is started, by the absence of a high level signal on the inverse output

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of the received interval of the received time, which is prohibited to work in a pulse signal. The occurrence of any further half-cycle of AND 9 elements and a one-time error results in a minimum of 10 (the waiting multivibrator 11 generates a pulse with a duration equal to 0.75 of the period of the bi-pulse signal).

such pairs of pulses in the second half of the clock interval of the received bi-pulse signal, which means that there is an error in the received signal. To eliminate the effect of this error on receiving further information, the value of the next symbol is checked for a combination of pulse pairs in the second half of the clock interval of the next bi-pulse signal. As a result, it is excluded

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the effect of distortion of one bi-pulse signal on the correct detection of the binary value of the second bi-pulse signal. The occurrence of a double or more group error in this case is not considered, since it is considered that such an error unambiguously leads either to a loss or to a recapitulation of a distorted message.

The shift of the received pulse sequence by half of the clock interval of the bi-pulse signal is performed using the delay line 2. The analysis of possible combinations of 5 pulses of the received and shifted sequences is performed with the help of the decoder 3. Formation

 two sequences of clock pulses, corresponding to the first and second half of the bi-pulse signal, is carried out using a 4 clock pulse generator. After the decoder 3 selects the moment of coincidence of two unit symbols in the first half-period using element 9, the trigger state is set to one. In the presence of two zero symbols using element 10, the trigger 12 is set to the zero state. The operation of these elements is resolved by signals from the second output of the 4-clock generator and by a high LEV1 signal. I from the inverse output of the waiting 35 multivibrator I1. When a decoder allocates 3 two single ones or

. two zero symbols in the second half-period of the bi-pulse signal using the third and fourth elements I 7 and 8, the signal from the first output of the 4 clock pulses is started, the idle multivibrator 1I is started, by the absence of a high level signal on the inverse output

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thirty

And the high level signal from its single output resolves the operation of the elements AND 5 and 10. The signal from the first output of the generator 4 clock pulses corresponding to the signal

d output of the decoder 3, or by using the element And 5 (if there is a zero pulse in the received sequence at the input of the decoder 3, and

one in shifted) sets the trigger 12 to a single state, or using element 6 (with the opposite combination of pulses) sets the trigger 12 to the zero state.

The generation of 4 clock pulses by the generator of synchronizing pulses controlling the operation of the device is carried out by differentiating the edges of the received pulses of both sequences of differentiating elements 16 and 17, at the outputs of which the pulses of the same polarity are formed. Element OR 18 merges them. Using trigger 19, they are separated into sync pulses of the first and second half periods.

Limiter 1 performs the restoration of the pulse shape received from the communication line.

During long breaks caused by exposure to long duration interference, the correct operation of flip-flop 19 may be disrupted; however, after some time, the true position of the bi-pulse signal will be found using the elements of the 9 and 10 and the output of one of them will be set to common mode and trigger 19. In addition, the differentiating elements 16 and 17 have the ability to restore one impulse, for example, by introducing a delay line, which is necessary to produce a sync impulses at disappearance of fronts of impulses,

caused by interference. I

The binary value of the received information to the consumer comes from the single output of the trigger 12, and the information is read using the sync pulses of the second half period.

The error signal in the received biopulse signal is the appearance of a low level signal at the inverse output of the pending-multivibrator I.

It is considered that the correct operation of the receiver at the beginning or resumption of the information exchange cycle is carried out by transmitting a null symbol at the beginning of the message.

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Claims (2)

1. The receiver bi-pulse signal containing the amplifier-limiter, 5 the output of which is connected to the first input of the clock pulse generator, to the input of the delay line, the output of which is connected to the first input of the decoder, characterized in that 0 that, in order to increase the reliability of reception by thinking of the group error, six elements AND, a waiting multivibrator, three OR elements and a trigger, the first and second inputs of which are connected to the outputs of the first and second elements OR, the first inputs of which are connected are introduced with the output, respectively, of the first and second elements And, the first inputs of which are combined and connected to the first inputs of the third and fourth elements And to the first output of the clock, the second output of which is connected to ervymi inputs of said fifth and sixth AND gates, the outputs of which are connected to second inputs of the first and second OR elements and to the inputs of the third OR gate, the output of which 0 is connected to the second input of the clock pulse generator, the third input of which is connected to the first input of the decoder, the first and second outputs of which are connected to the second inputs {and co5, respectively, of the first and second elements And, the third inputs of which are combined and connected to the single output of the waiting multivibrator whose inverse output is connected to the first 0 input of the fifth element And with the second input of the sixth element And, the third input of which is connected to the second input of the fourth element And and the third output of the decoder, the fourth output of which is connected to the third input of the fifth element And to the second input of the third element And, output which is connected to the output of the fourth element I and to the input of the waiting multivibrator, while the output of the limiter amplifier is connected to the second input of the decoder. 2. The receiver according to claim 1, characterized in that the clock pulse generator comprises the trigger, the OR element, and the first and second differentiating elements, the outputs of which are connected respectively 5 0 51282349 but with the first and second inputs of the OR element, whose output is connected to the first trigger input, the unit and inverse outputs of which are the first and second outputs respectively (JJuz.2 The clock pulse generator, the first, second, and third inputs of which are respectively the inputs of the first and second differentiating elements and the second input of the trigger.