SU1432756A1 - Device for monitoring failures of multichannel pulse trains - Google Patents

Abstract

The invention can be used in communication systems, automation and instrumentation to control the disappearance of multichannel pulse sequences with a relatively small number of them. The purpose of the invention — the simplification of the device — is achieved by realizing it; ycri .. on the same type of functional elements, having regular connections between each other. The device contains n D-flip-flops 1.1-1.P, inputs 2.1-2.P of monitored pulse sequences, unit 3 for registering the loss of pulse sequences, a group of outputs 4.1-4.P of the code of the missing pulse sequence. Due to the high regularity of construction and the presence in it of only one node with time defining elements (block 3), the predicted device g is convenient for implementation in an integral design. 3 il. cl

Description

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The invention relates to a pulse technique and can be used in communication systems, automation and measurement technology to control the disappearance of multichannel pulse sequences with a relatively small number of them.

The purpose of the invention is to simplify the device,

The goal is achieved through the implementation of the device on the same type of functional elements having regular connections with each other.

The proposed device can be implemented on triggers with two stable cells of a different type.

Figs 1 and 2 show electrical schematic diagrams of a device for monitoring the disappearance of multichannel pulse transients, built on D-type triggers and: 1K-type, respectively 5 in Fig. 3, an example of the implementation of a recording unit.

The device contains a chain of p (according to the number of controlled pulse sequences) of D-flip-flops 1.1-1EP connected in series, the direct outputs of each of which, except the last, are connected to the information input of the subsequent trigger, and the inverse output of the last trigger, inputs 2.1-2, n controlled pulse sequences, each of which is connected to a clock input of the corresponding trigger, block 3 of the registration of the loss of pulse sequences, connecting input from the direct output of one of the triggers 1.1-1.p, the outputs of the triggers form a group of outputs 4.1-4, n the code of the missing pulse sequence.

In the device using three 1K-type geers (FIG. 2), the direct and inverse outputs of each of the 1K-flip-flops, except the last, are connected to the first (l) and second (K) information inputs of the subsequent flip-flop, respectively, and inverse high, last trigger connected respectively with the second and first informational inputs of the first trigger, t, e, cross.

As a block 3 registration of the disappearance of pulse sequences as, for example, in the known

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the device can be used frequency

An example of the implementation of block 3, which ensures the registration of the absence of pulse signals at the input at a given time interval by changing the level of the constant voltage at the output, is shown in FIG.

A device for controlling (Fig. 1) the disappearance of multichannel pulse sequences works as follows.

Suppose device triggers 1 are in the state 000 ,,, 00. In this case, at all information inputs of the flip-flops, except for the first one, there will be a logical O signal, and the pulses of the controlled 1 sequences that arrive at the clock inputs do not change the state of the flip-flops, starting from the second. In the same. time from the inverse of the output of the last trigger to the information input of the first trigger receives a logical 1 signal and the first pulse of the first controlled sequence switches the first trigger to the second steady state. The device is set to state 100,, 00. The device remains in this state until the second input 2.2 of the group of inputs 2.1–2, n does not receive a pulse of the controlled sequence (regardless of the presence or absence of pulses at the other inputs of the group of inputs 2.1–2.n.) The first the pulse at the second input of the group of inputs 2 changes the state of the device to the state of the software, 00. one

The process of such alternate switching of the triggers continues until the device is set to state 111.,. 11, Then the device triggers are alternately switched to the state O,

Thus, under the action of the pulses of monitored sequences at inputs 2.1–2, n the triggers 1.1-I., the devices alternately change their state, and the outputs of the triggers constantly have pulse voltages, BLOCK 3, connected by the input to the output of one of the triggers, generates a logical signal at its output (log, 1 for the converter circuit shown in FIG. 3).

When any of the monitored pulse sequences disappears, for example, at the input 2.2 of the device, the device trigger 1.2 stops switching, and all the others stop. Correspondingly, the pulse voltage at the input of block 3 disappears and an Avariy signal appears at its output (log. O for converter circuit 3 shown in Fig. 3). In this state, the device remains until the missing pulse sequence is restored. .

When a newly missing pulse train appears, the device continues to operate, starting from the state that was established when the monitored pulse train hit.

At outputs 4.1-4. P triggers 1.1-, 1.n with all monitored sequences of pulses, there are constantly pulsed signals. When any of the monitored pulse sequences disappears, the state of the flip-flops 1.1-1, n ceases to change on the outputs 4.1-4. The code of the number of the missing pulse sequence will be set at the output code of the missing pulse sequence of the device. So, for example, in the absence of pulses at the second input 2.2 of the device, a code 100 is set,, 00, There is also a second code value 011 ,,., 11 for the same pulse sequence. Thus, for each of the monitored pulse sequences in case of There are two possible code values at the outputs 4.1-4, n, which are not difficult to decipher and, together with the signal at the output of block 3, be used to indicate a specific missing sequence.

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these pulses, which increases the informativity of the control of multichannel pulse sequences.

Similarly, the device operates, the circuit of which is shown in FIG. 2. The sequence of changes in the state of this device under the influence of monitored sequences of pulses arriving at the inputs 2.1-2.p is the same.

Due to the high regularity of construction (the identity of the links between the functional units of the device and the small number of types of these nodes) and the number of only one node in it (block 3) with the timing elements, the proposed device is convenient for implementation in an integrated design.

Claims (1)

Invention Formula A device for monitoring the disappearance of multichannel pulse sequences, which contains a block for registering the disappearance of pulse sequences, tires of controlled nor sequence, characterized in that, in order to simplify the device, a circuit of series-connected triggers is inserted in D, the output of the previous trigger is connected to the subsequent trigger, and the inverse output of the last trigger of the circuit is connected to the information input of the first trigger; the outputs of the triggers form a group of outputs the code of the missing pulse sequence, the clock inputs of the flip-flops are connected with the corresponding. controlled by tires of monitored sequences, the output of one of the triggers is connected to the input of the block for registering the loss of pulse sequences. if.1 P l .. 2.1 2.2 .g A4 (/ i l.fi Zn 0UB.Z 3