Device for suppressing interference in a transmission line binary signals

 

(57) Abstract:

The invention relates to the field of digital and pulse technique. Device for suppressing interference in a transmission line binary signals contains the inverter 1 on the transmission side, a three-wire communication line, two series-connected RS-flip-flop 2 and 3 and two diodes 4 and 5 at the receiving side, and the inputs of the RS-flip-flop 2 are directly connected with the direct and inverse wires of the transmission line information and each of these conclusions is connected to the positive bus of the power source through the diode anode connected to the input of the trigger 2 and the cathode to the positive bus of the power source. Direct and inverted outputs of the RS-flip-flop 2 is connected respectively with R - and S-inputs of the RS-flip-flop 3, and the outputs are the outputs of the RS-flip-flop 3. Achievable technical result is to reduce the effect of interference in the transmission of digital information. 4 Il.

The invention relates to the field of digital and pulse technique and is designed to suppress interference in the transmission of digital information.

Known cable reception amplifiers [1], designed to suppress noise in wire data transmission line containing the inverter is whom such device is when the reception of the useful signal with an obstacle, a hindrance not completely suppressed because of the properties of differential cascade, part of the reception amplifier. The disadvantage of such devices is illustrated in the time chart, provided in this application is shown in Fig. 3, where it is shown that the approximation of the amplitude of the voltage noise (Upthe value of the supply voltage (Ep), the disturbance is not suppressed due to the fact that interference is a common-mode signal for the differential cascade, at the approach of the common-mode signal to the value of the supply voltage (Ep) differential cascade common-mode rejection signal is reduced and the interference is amplified by the amplifier. In a production environment disturbance may exceed the value of the supply voltage of the differential amplifier, which further enhances the effect of the considered fault. Thus the lack of analogue is the presence of the receiving amplifier.

Closest to the proposed technical solution is chosen as the prototype receiver iimpulse signal error detection [2] , contains two D-flip-flop, two elements And modulo two. The inputs D and the first trigger is connected to the input D of the first trigger, and the second input to the inverted output of the first trigger. The output of the adder modulo two is connected to the inputs of the first and second elements And. the First item is a bug detector and its second input connected to the clock input, and its output is a signal output device errors. The second element is the detector of zeros, the second input is connected to the inverted clock input devices and the output to the input S of the second trigger.

This device provides only log errors and does not correction. To transmit information in addition to the information line required two mutually inverted clock line, which also in turn influenced by interference. Therefore, this device cannot be used in conditions with strong interference (e.g., manufacturing plants). In addition, the prototype is required to synchronize the information signal with a clock pulse, and using the information signal from the displacement sensor information signal is difficult to synchronize with the clock pulses. Thus, the disadvantages of the prototype are: the lack of elements and compounds, performing error correction; no ELEH the sensors (for example, move), not having a clock output.

The task is to improve the noise immunity of the transmission line. The problem is solved due to the fact that in the device for suppressing interference in a transmission line binary signals containing two triggers, according to the invention additionally introduced two diodes and the inverter triggers made in the form of RS-triggers, and the transmission of information between transmitting and receiving parts of the device made in the form of a three-wire line, and the outputs of the first flip-flop connected to the inputs of the second trigger, the inputs of the first flip-flop connected with direct and inverse wires of the transmission line information and each of these inputs is connected to the positive bus of the power source through the diode anode connected to the input of a trigger, and cathode to the bus power supply and the outputs are the outputs of the second trigger.

Comparative analysis of the prototype shows that the inventive device is characterized by the fact that two triggers are executed in the form of RS-triggers the input of the first RS-flip-flop is directly connected to the direct and inverse wires of the transmission line, and outputs the first RS-flip-flop is directly connected to the inputs wtaaa side. Thus, the proposed device complies with the criteria of the invention of "novelty."

The comparison of the proposed solutions with other technical solutions shows that in the known devices, there is no direct connection between the two triggers, which allows to conclude that the technical solutions according to the criterion of "inventive step".

The invention is illustrated by drawings, where Fig. 1 is a schematic diagram of the device of Fig. 2 - graphs explaining the operation of the device of Fig. 3 shows how the obstacle passes the output of the analogue of the invention, and Fig. 4 presents a schematic diagram of the prototype.

Device for suppressing interference in a transmission line binary signals (Fig. 1) contains the inverter 1 on the transmission side, a three-wire communication line, two directly connected in series RS-flip-flop 2, 3 and two diodes 4, 5 on the receiving side. The outputs of the first flip-flop 2 is connected to the input of the second trigger 3. The inputs of the first flip-flop 2 is connected with direct and inverse wires of the transmission line information. Each of the inputs of the first flip-flop 2 is connected to the positive bus of the power source through the corresponding diode 4, 5. Each diode STS are the outputs of the second trigger 3.

The inventive device operates as follows: if the data link is valid hindrance UP1UP2(Fig. 2), then the interference signal UP1shunted by a diode 4 (Fig. 2), and the interference signal UP2translates the first trigger 2 in the storage mode, where the output of this trigger information is stored about the useful signal, which preceded the appearance of interference UP1UP2(Fig. 2 g, h). Let the transmission line acts hindrances UP3UA4(Fig. 2), then the interference signal UA4shunted by a diode 5 (Fig. 2 g), and the interference signal UP3creates the inputs of the first flip-flop 2 a prohibited combination that leads to both its outputs a high logic level, which translates the second trigger 3 in the storage mode, where the output of this trigger information is stored about the useful signal, which preceded the appearance of interference UP3UA4(Fig. 2 W, h), thus the proposed device eliminates the passage of the interference signals UP1UP2UP3UA4the output of the device.

Experimental studies of the claimed device for suppressing interference in a transmission line binarnej interference in the transmission line binary signals and allows for directly cascaded RS-triggers much to reduce the influence of interference on the line. For example, the length of the front of the trigger tf= 20 NS and the maximum transmission frequency tmax=300 Hz, and the duration of the interference (0.01 to 0.3 MS), the influence of interference is attenuated no less than 10,000 times.

Device for suppressing interference in a transmission line binary signals containing two triggers, characterized in that it additionally introduced two diodes and the inverter triggers made in the form of RS-triggers, and the transmission of information between transmitting and receiving parts of the device made in the form of a three-wire line, and the outputs of the first flip-flop connected to the input of the second trigger, the inputs of the first flip - flop-direct and inverse wires of the transmission line information and each of these inputs is connected to the positive bus of the power source through the diode anode connected to the input of a trigger, and cathode - bus power supply, and the outputs are the outputs of the second trigger.

 

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SUBSTANCE: proposed device depends for its operation on comparison of read-out signal with two thresholds, probability of exceeding these thresholds being enhanced during search interval with the result that search is continued. This broadband signal search device has linear part 1, matched filter 2, clock generator 19, channel selection control unit 13, inverter 12, fourth adder 15, two detectors 8, 17, two threshold comparison units 9, 18, NOT gates 16, as well as AND gate 14. Matched filter has pre-filter 3, delay line 4, n attenuators, n phase shifters, and three adders 7, 10, 11.

EFFECT: enhanced noise immunity under structural noise impact.

1 cl, 3 dwg

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