SU1019657A1 - Discrete information receiver - Google Patents

Abstract

YARIVMNIK DYASKRETVOY HIMOPMTSYI, Otoraziyam letspratsf zykrychru kzzd, shchyzhol which is connected to the first hrdsh triggerg “multnaibratfa” - to “op is connected to the first input of the first element And, 8ts.inp, to the second, which is ncttr. so ui and y-, so that, for a reason tittggggars, the element and the second element I are entered into it, the first input of which is connected to the itepBiiM input of the first ele1 4enta I, the third input of which connects the initial stake to the decoder n with the detunus hickey tnf the input of the second element And, vykhl kotyosugo connected to the VTSFM inputs of the multivibrator and the trigger. Ki inf. W

Description

The invention relates to a technique for transmitting discrete information and can be used in automated systems for collecting and processing digital information. A discrete information receiver is known that contains an initial code decoder, the output of which is connected to the first inputs of a trigger and a multivibrator, the output of which is connected to the first input of the first element And, to the second input of which the output of the trigger Cl is connected. However, the known receiver has a low fidelity of reception. The purpose of the invention is to increase the reception OF .CTiH of reception i. The goal is achieved in that the receiver of discrete information contains a descrambler of initial code, the output of which is connected to the first inputs of a trigger and the multivibrator whose output is connected to the first input of the first element .and .o trigger, entered the delay element and the second element And, the first input of which is connected to the first input: the first element K, the third input of which is connected to the input of the decoder of the initial code and the output of the element aDerzhki, input, which is connected to the second input of the second AND gate, whose output is connected to second inputs of the multivibrator and a flip-flop. FIG. 1 shows a structural electrical CXBNP of the proposed receiver in FIG. 2 - diagrams, for example, which explain his work. The receiver of discrete information contains a decoder 1 of the initial code, a delay element 2, a multivibrator 3 valve 4, consisting of a trigger 5 and the first element And b, the second element And 7.. The receiver works as follows. B. the initial state of the work. tivibrator 3 is prohibited, and the information output of the receiver is covered by the potential. coming from trigger 5 on one of the inputs of the first And 6 element. The receiver is in the standby mode. : I use Gilbert prefix codes to transfer information. ne) an information signal is transmitted by the prefix of the form 11. .110,. the full role of the initial code .. When transmitting a long, informational signal, c. code block B. There are fixed symbols of the form.O. The prefix length is equal to P - K + 2, where K is the width of the information signal between zuz fixed symbols (FIG. 2q). information signal through the element 2 of the delay for the time tj tjj (P-l), where to - the duration of a single symbol is fed to the decoder 1 the initial code code and the information input of the gate 4 (Fig.). When registering with the prefix decoder 1, at the moment when the transition 1 - .0 is fixed, a signal is formed (Fig. -2), which sets the trigger 5 of the valve 4 to a position allowing the output of information through the second element And 7 (Fig.). At the same moment. Multivibrator starts working. 3, which generates signals that coincide in time and duration with fixed symbols in the code block of the input information (Fig. 2) and prohibit the output of the latter through the first element And b (Fig.,. For the same signals, the second element And 7 determines the presence block at the input of the device of fixed characters. During the reception of a code block of any length multiple to K, the absence of a fixed character can be registered only once, namely at the end of the code block (Fig. 2e), which serves as the formation criterion by the second element And signal 7 End of the block that brings trigger 5 and multivibrator 3 to the initial waiting state. The End of block signal is also formed in case of synchronization of the receiver when the moments of coincidence of signals of the multivibrator 3 with the position of fixed symbols are violated. erroneous information is given (the receiver is placed in the standby mode), i.e., it provides an increase in the fidelity of the transmission, which is not characteristic of the known device. As a delay element 2, a shift register can be used at the Pm1 bit. The technical economic effect of the invention is the following. The proposed receiver has all the advantages of a known device, namely, it ensures the start of work at an arbitrary point in time without prior synchronization with a variable length of the code block. These changes in the block diagram and links allowed, by reducing the redundancy of the code block, also to increase the transmission capacity, which makes it possible to obtain an additional positive effect. This is shown by the example of a comparative analysis of the proposed code block redundancy factors. GO Receiver and known device -, where S is the number of redundant, al is the number of information symbols in the code block. . As a rule, the length of the phasing codes when the probability of false phasing is P, f 1 10 is P 1by 20 characters. The length of the information part of the code block at. This should be no more than 40-160 sys, In the known device S K, +: + K, where KI, K, jM Lu is, respectively, the code of the beginning, end, and lengthening of the block. As a rule, to simplify the circuit implementation of the device. choose K. K, Kj i. , S in 3 K | ,. Redundancy ratio while for p 100 it is -0.48, v. h / A SchV proposed receiver S Cc + Cd where Cfs.- the number of fixed Si1 "sholov in the code block, which is equal to 100 V 5 Then S 23, and 23 Cha W- ie The redundancy is reduced by approximately 50%, which significantly reduces the load on expensive communication channels.

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Claims (1)

A DISCRETE INFORMATION RECEIVER containing a nayaalyu decoder of code n, the output of which is connected to the first inputs of a trigger and a multivibrator, whose output / is connected to the first input of the first element AND, to the second input of which a trigger output is connected I the "what" of the whole increase / voR ⁴ NOSTA receiving therein introduced delay element and the second element and the first input of which is connected to the first input of the first aND gate, the third input of which is connected to the input deshmfratora initial sneaker print and output element zaderzhkivhod Kotor the second is connected to the second inputs of the second element And, the output of which is connected to the second ' _h inputs of the multivibrator and trigger.