SU578671A1 - Device for forecasting checkup of communication channel state - Google Patents

Description

3, the second 4 and third third 5 threshold blocks, as well as the generator of 6 clock pulses, the counter 7, the first 8 and the second 9 elements And the trigger 10, in addition, the decoder And, the first 12 and the second 13 elements of the Inhibit, element 14, with In this way, the output of the first threshold unit 3 through the NOT element 14 and through the first element Ban 12 and the first element 8 connected in series to the first input “Reset” and to the information input of the counter 7, whose outputs are connected to the corresponding inputs of the decoder 11, one of the outputs of which connected to sec “Tick counter reset to one of the trigger inputs 10, and the other decoder outputs And through the second element And 9 are connected to the output of the second threshold unit 4, the other input of the trigger 10 and one of the inputs of the second element 13, another input of which is connected trigger 10, in addition, the output of the third threshold unit 5 is connected to the second inputs of the first element of the Ban 12 and the second element And 9, and to the second input of the first element And 8 connected generator output 6 clock pulses.

The structure works in the following way.

The control signal from the output of the channel (path) is fed to the input of amplifier 1. At the output of inverter 2, the voltage is inversely proportional to the level of the signal in the channel (path) of communication. This voltage is applied to the input of threshold blocks 3, 4 and 5 (Fig. 2, a). The nature of the underestimation of the signal level is divided into two types. The nerve one is underreporting at high speed (Fig. 2, A), the second one - with a slow rate of change of the signal level (Fig. 2, B). The separation of signals according to the rate of change is performed by the counter 7 and the trigger 10. At the output of the counter 7, the number of counted imulses is inversely proportional to the magnitude of the velocity. At a high rate of change, after the first threshold block 3 is triggered (Fig. 2b), a signal appears at the output of the first element, Ban 12. From the output of the first element, the signal goes to one of the inputs of the first element, And 8, and to the other input a sequence of rectangular pulses from a generator of 6 clock pulses (Fig. 2, d). The pulse frequency can be selected depending on the temporal characteristics of the prediction procedure. Counter 7 starts counting. With a further decrease in the signal level, the third threshold unit 5 (Fig. 2, c) is triggered and a signal is simultaneously sent to the prohibitor input of the first element Ban 12 and to the input of the second element AND 9. Counter 7 stops counting. A signal appears at the outputs of the decoder 11 if the counter 7 has from five to fifteen pulses. When signals from the outputs of the third threshold block 5 and decoder 11 arrive at the inputs of the second element I 9, a prediction signal appears at its output, notifying that

after some time, the communication will break (Fig. 2, g). The HE element 14 is necessary for resetting the counter 7, if random fluctuations of the pilot signal level cover only the threshold of the first threshold unit 3 at the first underestimate or the threshold of the third threshold unit 5 at the second underestimate type, after which the terminal signal level is restored zi If counter 7 counted from one to four pulses and the third threshold block 5 was triggered, the interruption process is considered sudden, and the output of the second element of the Ban 13 does not send a signal

the prediction, and after the triggering of the second threshold unit 4, there will be an alarm signaling the interruption of communication.

At a slow rate of change of the signal level after the signal appears at the sixteenth output of the decoder 11, the counter 7 is reset to the initial state, simultaneously transferred to another state, the trigger 10 and the signal from its output goes to the inhibitory input of the second element.

13, and its output is blocked. Duration of time blocking the output of the second element The prohibition depends on the rate of change of the signal level. By further decreasing the level of the signal, the meshes 7 automatically counts and, after filling up the memory capacity, are reset to the initial state. This process continues until the second threshold unit 4 is triggered. When it is triggered, the signal from its output goes to the input of trigger 10 and throws it into its outgoing state. The signal from the prohibiting input of the second element Prohibit 13 is reduced, and the forecast signal appears at its output (Fig. 2, k).

Fort .1 llu and 3 O rete n and

A device for predictive monitoring of the state of the communication channel, comprising a series-connected amplifier and inverter,

the output of which is connected to the inputs of the first, second and third threshold blocks, as well as a clock pulse generator, a counter, the first and second And elements, and a trigger, characterized in that, in order to increase

accuracy of control, the decoder is entered, the first n is the second element of the Ban and the element is NOT, while the output of the first threshold block through the element is NOT and through the first element of the Ban and the first

element H is connected respectively to the first input “Reset” and to the information input of the counter, whose outputs are connected to the corresponding inputs of the decoder, one of the outputs of which is connected to the second input “Reset counter n to one of the trigger inputs, and the other outputs of the decoder through the second element H are connected with the output of the second threshold unit, another input of the trigger and one of the inputs of the second element Prohibition, to the other input of which there is a connection for the trigger output, in addition, the output of the third threshold unit is connected to the second input m of the first member and the second member prohibition And, as to the second input of the first AND gate connected to the output of the clock.

Source of information taken into account in the examination

1. Channels nersdachp data. Ed. V. O. Schwartzman. L1., “Holy Day, 1970, p. 56.

2. The author's certificate of the USSR L 320944, cl. H 04 M 1/74, 1969.

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