SU1571775A1 - Device for regulation of signal level in communication line with repeaters - Google Patents

Abstract

The invention relates to devices for transmitting analog and digital signals over long distances. The goal is to improve the accuracy of regulation. The signal of the control frequency from the source of the control signal 1 enters the communication line and occurs successively through repeaters, in each of which a signal is generated at the output of the receiver of the control signal 4, the value of which is proportional to the value of the control signal at the output of the adjustable amplifier 3. In the comparison block 5 the output signal of the receiver of the reference signal 4 is compared with the voltage produced by the source of the threshold voltage 7, and a control signal is generated at the output of the comparator unit. 1 il.

Description

The invention relates to telecommunications and can be used in systems for transmitting analog and digital signals over long distances.

The purpose of the invention is to improve the accuracy of regulation.

The drawing shows a structural electrical circuit of the device for adjusting the signal level in communication with the repeaters, i The device contains a source 1 of the control signal, a repeater 4, each of which contains an adjustable amplifier 3, a receiver 4 of the control signal, block 5 Comparison , pulse shaper 6, threshold voltage source 7, counter 8, Detector 9, 10 sd register, first key 11, control unit 12, memory 13, second delay key 14 and 15.

A device for adjusting the level of a signal in a communication line with transponders operates as follows.

The control frequency signal from source 1 enters the communication line and passes successively through repeaters 2. In this case, at each amplifying point at the output of receiver 4, a signal is generated whose magnitude is proportional to the value of the control signal at the output of adjustable amplifier 3 of this point. In block 5, the output level of the receiver 4 is compared with the threshold voltage produced by the source 7, and a control signal is generated at the output of block 5.

From the output signal of the receiver 4, the shaper 6 forms a pulse sequence arriving at the detector 9 and the counter 8, the output of the detector 9 forms the level O in the absence of a control signal in the line and the level 1 if present, and the output of the counter 8 with the conversion factor S each S-th pulse of the input sequence. If the control signal in the line is missing, then there are no pulses at the output of the imaging unit 6 and the register 10 is reset to zero by the signal from the output of the detector 9. After the control signal arrives at the zero input of the register 10, level 1 arrives. At the same time, after entering the information input of the register M

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pulses at the output of the Mth digit of the register are set to 1, and on the others, levels O.

After the occurrence of 1 at the K-th register output at the K-th amplifying point, after a period of time determined by block 15, the first key 11 closes and the second key 14 opens. As a result, the control signal from the output of block 5 through the first key

11 enters block 12 and in the K-th repeater 2 the process of adjusting the gain of the amplifier will begin. At the end of the adjustment process, the value of the control voltage will be set at the output of unit 5, the value of which corresponds to the required gain ratio of the amplifier in this repeater 2.

After entering the information input of the register 10 (K – H) th pulse, the O level will be set at the K th output, and the level 1 will be set at the (K + 1) th output. At the same time, record the output voltage of block 5 into block 13 , with a delay in block 15, the second key 14 is closed and the first key 11 is opened, followed by the block

12, a control voltage is supplied from the output of block 13, which is kept constant until the next occurrence of level 1 at the K-th bit of the output of register 10.

With the conversion factor of counter 8 equal to S, the process of adjusting the transmission coefficient in the first repeater 2 begins after S periods of the control frequency oscillations and ends after 2S periods, and so on in the K-th repeater 2 begins after KS periods and ends after (K + 1 ) S periods. The value S is selected on the basis of the completion of the adjustment process at a separate point for the S periods of the pilot signal.

Claims (1)

Invention Formula A device for adjusting the level of a signal in a communication link with a repeater, containing a source of a control signal connected to the input of the communication link and repeaters connected to the link breaks, each of which contains an adjustable amplifier whose input and output are input and output repeater connected to the output adjustable an amplifier connected in series with a pilot signal and a comparator unit, to the other input of which a threshold voltage source is connected, as well as an adjustment unit whose output is connected to the second input of an adjustable amplifier, characterized in that, in order to improve the control accuracy, each repeater is inputted a memory unit, first and second keys, a delay unit, a detector and a series-connected pulse generator, a counter and a shift register, five the reset input of which is connected through the detector to the output of the pulse generator, the input of which is combined with the input of the comparator unit, the output of which is connected to the input of the memory unit and through the first key to the input of the control unit connected to the output of the second key, which input is connected to the output of the memory unit The control input of which is connected to the output of the shift register and to the input of the delay unit, the output of which is connected to the control inputs of the first and second keys.