SU1160545A1 - Device for protection against pulse interference - Google Patents

Abstract

A DEVICE FOR PROTECTION AGAINST IMPULSE INTERFERENCE, containing a multi-input element OR, whose inputs are connected to the input tires of the device, a ruler of output two-input elements AND whose outputs are connected to the output tires of the device, a two-input element And, and the first delay element, different in that, in order to increase the noise and accelerate the time of transmission of pulsed discrete information signals, a ruler of two-input input elements OR a second delay element is entered into it, and the outputs of the ruler are input two-input elements OR are connected to the first inputs of two-input output elements AND, the outputs of which are connected to the first inputs of the input two-input elements OR, the second inputs of which are connected to the input buses of the device, the output of the multi-input element OR is connected to the two-input input of the two-input element And, whose output is through the first delay element and the second element of the delay ment is connected to its second input, and the output of the first delay element is connected to the second inputs of the output two-input line array I.

Description

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4 SP The invention relates to digital computing and telecommunications and can be used, in particular, in the equipment for receiving pulsed discrete information to protect against reflected signals in inconsistent communication lines. A device is known that uses the principle of pulse width and time modulation, in which the entire group of signals being processed is in the interval between two clock signals, i.e. both information and clock signals are transmitted over one common communication circuit in series with the interval between "bursts of information signals equal to the interval quantizing 1. However, the device cannot be used for parallel transmission of a group of signals simultaneously over several circuits. It can be used only for sequential transmission of the entire set of information signals along one circuit and subsequent temporary separation of them from each other. The closest in technical essence to the present invention is a device for protection against impulse noise containing an OR multi-input element, whose inputs are connected to the device input ports, a line of two-input output elements And whose outputs are connected to the device's output interface, a two-input element And, and the first delay element , the output of the multi-input element OR is dinene - With the input of the installation of a two-input trigger, whose direct output through the delay element is connected to the first input of the And element and through an inverter with the second input element is And, the output of which is connected to the first inputs of a ruler of output two-input elements AND 2. A disadvantage of the known device is the low noise immunity due to the operation of the device from any difference of the output signal, as well as a greater delay in transmitting the output signal to the device output. The aim of the invention is to increase the noise immunity and accelerate the transmission time of pulsed discrete information signals. The goal is achieved by the fact that the B device for protection against impulse noise, containing a multi-input element OR, whose inputs are connected to the input buses of the device, a ruler of output two-input elements AND whose outputs are connected to the output wounds of the device, a two-input element And and the first delay element, entered a ruler input two-input elements OR and the second delay element, and the outputs of the line of input two-input elements OR are connected to the first inputs of the output two-input elements AND whose outputs are soy Ina with the first inputs of the input two-input elements OR, the second inputs of which are connected to the input ports of the device, the output of the multiple-input element OR is connected to the first input of the two-input element AND, the output of which through the first delay element and the second delay element is connected to its second input, and the output of the first the delay element is connected to the second inputs of the output two-input line array I. In FIG. 1 shows the wiring diagram of the protective device against impulse noise; in fig. 2 - timing diagrams illustrating the operation of the device. The protection device, from impulse noise, contains a multi-input element OR 1, whose inputs are connected to the output paths 2 devices, a line of output two-input elements AND 3, the outputs of which are connected to the output buses of the device, a two-input element AND 4 and the first delay element 5, a line of input two-input elements OR 6 and the second delay element 7, the outputs of the line of input two-input elements OR 6 are connected to the first inputs of the output two-input elements AND 3, the outputs of which are connected to the first inputs of the two input input elements OR .6, the second inputs of which are connected to input 2 of the device, the output of the multi-input element OR 1 is connected to the first input of the two-input element AND 4, the output of which is connected to its second input through the first delay element 5 and the second delay element 7 the first delay element 5 is connected to the second inputs of the output two-input IZ line. The device works as follows. In the initial state in the absence of information signals, all the first inputs of the input elements OR 6, and all the inputs of the multi-input element OR I are set to a low level. The output of each input element OR 6 is also set to a low level, which neither the first input of the corresponding output element AND 3 is supplied, and the output of each of them is also set to a low level, which is fed through the feedback circuit to the second input of the corresponding input element OR 6. At the output of the element OR 1 in the initial state, a low level is also set, which is fed to the first input of the element AND 4, a low level from the output of which is fed to the input of the first delay element 5, which is zuets-shot. At the direct output of the first delay element 5 in the initial state, a low level is set, which is fed to the second inputs of each of the n output elements AND 3 and simultaneously to the input of the second delay element 7, which also uses a standby multivibrator. The inverse Output of the second delay element 7 in the initial state establishes a high level of the signal, which is sent as the resolution to the second input of the AND 4 element. As soon as the first input of one or several input elements OR 6 receives the information signal of a positive polarity with interference in the form of a reflected signal or in the form of crosstalk, then this pulse signal of positive polarity from the output of the input element OR b goes to the first input-output element AND 3 and one TERM through an OR 1 as a pulse signal of positive polarity will go to a first input of AND gate 4, the second input of which is maintained a high level enable signal from the inverse output of the second delay elemeita 7. As a result, the pulse signal of positive polarity from the output of the element AND 4 starts up the first front element 5 of the delay, at the direct output of which appears a pulse of positive polarity, rectangular shape and a strictly defined and necessary duration. This pulse signal as a strobe signal is fed to the second inputs of all n output elements And 3 and at the same time, with its leading edge, it starts the second element 7 of the delay. The pulse signal of negative polarity from the output of the inverse of the second delay element 7 of a duration equal to Ti Tyueet. (where T is the negative polarity pulse duration at the inverse output of the second delay element 7; T dvn - the minimum period of information signals following; Fuss. - the maximum recovery period of the second delay element 7) will go to the second input of the And 4 K element to block possible triggering the first delay element 5, and therefore the second delay element 7, from any disturbance accompanying the information signal. Such a restart blocking from impulse noise in the form of reflected signals, crosstalk, etc. is all the more reliable the more precisely the duration of the blocking signal of negative polarity coming from the inverse output of the second delay element 7 to the second input of the And 4 element is set relative to to the minimum possible period of the following, processed information signals. As a result, a positive polarity strobe signal, sent from the direct output of the first delay element 5 to the second inputs of the IZ output element line, coincides with the positive polarity information signal at the first input of one or several output elements I 3. At the same time, the result of this coincidence at the output of one or several output elements And 3 simultaneously, a pulsed signal of positive polarity, of the required duration, appears without gaps and dips throughout the entire pulse duration, since this The feedback signal is fed to the second ID of the corresponding input element OR b and forms the output signal of this element, and hence the first input of the corresponding output element AND 3, a positive polarity signal without breaks and dips, even if the first input of the input element b OR there is a processed information signal of various duration and it has various dips, breaks, steps, ringing and so on. Thus, the device is blocked from the influence of any kind of interference for the entire remaining time of the minimum period of the information signal Tmin. The waveform at the output of the proposed device is stable and does not depend on any dips, breaks, steps, ringing and other distortions of the waveform coming from the output of the receiving impulse cable amplifier to the input of the proposed device. The duration of the generated signals at the output of the proposed device is stable and does not depend on the duration of the signals entering the device. Installing the proposed device between the output of the receiving impulse cable amplifiers and the information consumer circuit almost completely eliminates the reflected signals appearing at the output of these cable amplifiers in uncoordinated communication lines, partially from crosstalk and other types of impulse noise, while ensuring minimum signal transmission delays.

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Claims (1)

DEVICE FOR PROTECTION AGAINST PULSE INTERFERENCE, containing a multi-input OR element, the inputs of which are connected to the input buses of the device, a line of output two-input elements AND, the outputs of which are connected to the output buses of the device, a two-input element And and the first delay element, characterized in that, in order to increase the noise immunity and accelerating the transmission time of · pulsed discrete information signals, a line of input two-input OR elements and a second delay element are introduced into it, and the outputs of the line of input two-input OR running elements are connected to the first inputs of the output two-input AND elements, the outputs of which are connected to the first inputs of the input two-input OR elements, the second inputs of which are connected to the input buses of the device, the output of the multi-input OR element is connected to the input of the two-input AND element, the output of which is through the first delay element and the second delay element is connected to its second input, and the output of the first delay element is connected to the second inputs of the line of output two-input elements I. Figure 1