SU1188896A2 - Device for automatic checking of communication channels - Google Patents

Abstract

THE DEVICE OF AUTOMATEDPRESS CONTROL OF COMMUNICATION CHANNELS No. 930707, characterized in that, in order to extend the functionality by providing end-to-end control while maintaining high accuracy, the first, second and third switching units, the first and second memory blocks, an additional threshold element, an additional key, an additional adder, mode switch and reset element, while the output of the first adder is connected to the first input of the second adder via the first switching unit, the output of the third key is connected to the second input of the second adder through the second switching unit, the output of the residual damping control unit is connected to the input of an additional threshold element, the control input of the additional key and to the first input of the additional adder, the output of which is connected to the signal input of the first memory unit, the control input of which is connected to the first output of the mode switch, and the output is connected to the control input of the second com- munication unit and the control input of the first switching unit, the first signal input of which is connected to the first signal input ohm of the third switching unit, the output of which is the output of the automatic control device of the communication channels, and the second input, combined with the second input of the first switching unit, is the input (Company backup link, the control input of the third switching unit (L combined with the second control input of the first switching unit and connected to the output of the second memory unit, the installation input of which is combined with the installation input of the first memory unit and connected. with one output of the reset element, the second output of which, like the second 00 00 00 output of the mode switch, is connected to the positive power bus, the output of the PGU level control unit is connected to the second input of the additional adder, the output is to-. 05 of the additional threshold element is connected to the signal input of the additional key, the output of which is connected to the signal input of the second memory unit, the output of the matching amplifier is connected to the third input of the first switching unit.

Description

The invention relates to radio engineering and can be used for automatic monitoring of channel integrity, residual attenuation and noise level occurring in communication channels, including between city audio broadcast channels. The purpose of the invention is to expand the functionality of the device by providing end-to-end monitoring of the quality parameters of communication channels while maintaining a high degree of control. The drawing shows a structural diagram of the device for automatic control of communication channels. The device for automatic control of communication channels contains a matching amplifier 1, the first 2 and rtoroy-3 adders, notch filter 4, a detector. 5, first 6 and second 7 threshold elements, first 8, second 9 and third 10 keys, noise control unit 11, signaling unit 12, first 13 and second 14 delay elements, residual attenuation unit 15, first 16 and second 17 blocks control generator 18 control signal, a trigger pulse generation unit 19, a compensating signal generation unit 20, first 21 second 22 and third 23 switching blocks, switch 2 modes, first 25 and second 26 memory blocks, additional adder 27, additional threshold element 28 are optional Key 29 is a button 30 reset. The device works as follows. The working communication channel at the input of the matching amplifier 1 receives broadcast signals, into the pauses of which a control signal is inserted using a transmitting device. The output of the matching amplifier 1 through the notch filter 4, in which the pilot signal is suppressed, broadcasts signals to detector 5, the detected voltage from which is fed to threshold elements 6 and 7. If the level of the broadcast signals is within normalized limits, then the detected voltage The detector coming from detector 5 is higher than the threshold of threshold elements 6 and 7. In this case, the first threshold element 6 blocks the residual attenuation control unit 15, the noise level control block 11 through the control inputs. and the first key 8, and through the first delay element 13 and the first control unit 16 the second key 9. The second threshold element 7 closes the third key 10 and through the second delay element 14 and the second control block 17 blocks the pilot signal generator 18. Thus, the sound signals together with the control signal, the passage through the matching amplifier 1, the second signal input of the first switching unit 21 and the second adder 3, arrive at the subsequent control point without changes. Moreover, the other inputs of the first switching unit 21 and the second switching unit 22 are closed. In this case, the broadcast signals reach the consumer from the output of the matching amplifier 1 via the first adder 2 and the first signal input of the third switching unit 23, while the second signal input of the unit 23 is closed. When a modulation pause program appears in a broadcast program, the pilot signal, which was previously entered into transmission pauses, follows the same path as the broadcast signals, i.e. from the output of amplifier 1 through the second input of the first switching unit 21, the second adder 3 and further along the path of the channel, which allows the control signal to be used for end-to-end monitoring of the communication channel. In the transmission pauses, the detected voltage arriving at the threshold element 6 becomes lower than the threshold, so the signal from the output of the threshold element 6 stops blocking blocks 15 and 11 and keys 8 and 9. At the same time, the control signal and noise coming from the channel the time of pauses from the output of amplifier 1, the passage through the compensating signal generating unit 20 and through the public keys 8 and 9, arrive at the second input of the first adder 2, where they are in antiphase with the signals directly coming from the output of amplifier 1. Benefit from the exit

adder 2 through the tertiary block 23 | commutati1; and a broadcast signal arrives, in the modulation and technological pauses of which there is no control signal, interference and noise coming from the previous section of the path. Thus, the high level of the control signal introduced into the channel during end-to-end monitoring does not cause a deterioration in the quality of the broadcasting received by the users. Nala

When the channel quality deteriorates (for example, if the residual attenuation increases or the noise level increases), blocks 15 and / or 11 operate out of allowable limits during transmission pauses, since the blocking signals from threshold element 6 are removed in this case. In this case, the control signals from blocks 15 and 11 are received at the signaling unit 12, in which an indication of a specific type of fault occurs. At the same time (in case of overstated noise level) from the noise level control unit 11, the control signal is fed to the first input of the additional adder 27 and through it to the first input of the first memory block 25. If the residual attenuation is too high (from 6 to 12 dB from the control unit 15, the control signal is fed through the second input of the additional adder 27 to the first input of the first memory block 25. The control signal from the control unit 15 also goes to the inputs of the additional threshold element 28 and the additional key 29. However, from the output of the additional key 29, the signal in this case is not received, since the signal level from block 15 is higher than the threshold of the additional threshold element 28, which, having triggered, blocks the additional Yny key 29,

Thus, in the cases under consideration (when the residual attenuation is 6 to 12 dB or / and the noise level is excessive), the first memory unit 25 receives a signal that puts it into a working state. In this case, the output of the block

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The memory 25 receives a signal at the first control input of the first switching unit 21 and the control input of the second switching unit 22. In this case, the second signal input of the block 21 is closed, and its first signal input opens and, therefore, through the switching unit 21 and further to the input of the adder 3, the broadcast signal passes not directly from the output of the matching amplifier 1, but from the output of the adder 2, t . the same signal that goes to the consumer. According to the above, in this broadcast signal there is no control signal from the previous section, as it is suppressed. Simultaneously with the arrival of the control signal from the output of the memory block 25, the signal goes to the input of the block 21 and to the control input of the second switching unit 22. Since simultaneously with the triggering of the threshold element 6, the threshold element 7 is also activated, then through the switching unit 22 from the generator 18 through the supercharger 3, a new control signal arrives in the channel, i.e. the regeneration of the pilot signal, previously suppressed in adder 2, occurs.

Thus, the implementation of these operations automatically translates the device from end-to-end control to a part.

At the end of the modulation pause, the keys 8-10 are closed again and the broadcast program continues to come from the matching amplifier 1 through the adder 2 and the first signal input of the unit 23 to simulation and then through the adder 3 to the next channel point. The transfer from the pass-through control mode to the part-control mode in this case does not fall apart, since the memory block 25 continues to issue a control signal to the switching blocks 21 and 22 and the control can be repeated again in the next pause.

In case of residual attenuation by more than 12 dB, which is characterized as a technical stop (emergency) at which the channel does not work further, block 15 receives a signal at the input of an additional threshold element ZS with a level lower than its threshold of operation. In this case, the lock is removed from the additional key 29, and from its output a control signal is received to the second memory block 26. Simultaneously, from the input of the additional controller, the control signal is input to the first memory block 25. The effect of the signal from memory block 25 was described above. The signal from the output of the memory block 26 through the control inputs of the switching blocks 21 and 23 produces their additional Kot-c-fyTa, the second. And the first signal inputs of the block 21 are closed, its third signal input, from

kryvaetsa. the first signal input of block 23 is closed and opened

In the case under consideration, the vegdani program enters the commutation unit 21 and further to the second sum 1ator 3 not from the working channel through the matching amplifier 1, but from the backup channel, since the broadcast program from the working channel as a result, IB, J and RI does not arrive, Corresponding. immediately to the consumer, the second input of the switching unit 23, the switching point sigram- and n ji ;; nor the post 7aet ::; : zerkogo channel. So Kai; The program of the channel is received by the Receiver KVP without a control signal ;,, then the second adder 3 is fed into the channel and the control signal is sent: according to the test mode: precise control,

Takrp-1, the device offered is used in track modes: end-to-end and per-site control when operating from the working channel, and also per-user control when operating from the backup channel.

The transition from end-to-end mode to part control is performed automatically when the quality of the channel deteriorates. In case of emergency condition of the working channel, the device automatically switches to work from the backup channel, saving the mode of part-by-part control. If necessary, the transition from end-to-end

to the partial control (without waiting for the deterioration of the quality of kgnl; la) are condemned) with a tamper switch of 24 modes by feeding

the signal on the second input of the block 25 of memory ttt, 1l return device and ;;

Regimentacrosis control mode

reg: and: 4 pass-through control (and after

channel troubleshooting)

P15}; change; from the reset button 30, with;: the block pa 25 i; 26 :: ic. enters; aiipH; Keui e., posGp LM, a on; ee sn: 5: io ;; ci-j, and the investigator JC: 5; from them nodes and

ii; K (, vi, iioe noHO3t: e {j e,

iaK-B in a way, the proposed projection of the ecstats gives in (; it is necessary to produce the end-to-end KoSerT channel Koirrpojib; Tipi; at a certain level of control iioro cifFHa.aa, that o-1ssggga p-shaet high: about control accuracy: : - x: 7i, ieii.i; i: i: ;;) score 1П; channel of the channel of the government (1: og troll .1: for in the limits of reception,

or jio the whole route of the channel.

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Claims (1)

DEVICE OF AUTOMATIC CONTROL OF COMMUNICATION CHANNELS according to ed. No. 930707, characterized in that, in order to expand functionality by providing end-to-end control while maintaining high accuracy, it introduced the first, second and third switching units, the first and second memory units, an additional threshold element, an additional key, an additional adder, a switch operating modes and a reset element, while the output of the first adder is connected to the first input of the second adder through the first switching unit, the output of the third key is connected to the second input of the second adder through The second switching unit, the output of the residual attenuation control unit is connected to the input of the additional threshold element, the input of the additional key control and to the first input of the additional adder, the output of which is connected to the signal input of the first memory unit, the control input of which is connected to the first output of the mode switch, and the output is connected to the control input of the second switching unit and the control input of the first switching unit, the first signal input of which is connected to the first signal input of the third unit ommutatsii, the output of which is the output of the automatic control of communication channels devices, and a second input, combined with a second input of the first switching unit is input backup communications channel, the third switching unit control input is combined with a second input of the first switching control unit and is connected to the output of the second ⁵ block memory, the installation input of which is combined with the installation input of the first memory block and connected. with one output of the reset element, the second output of which, like the second output of the mode switch, is connected to the positive power bus, the output of the noise level control unit is connected to the second input of the additional adder, the output is up to. an additional threshold element is connected to the signal input of an additional key, the output of which is connected to the signal input of the second memory unit, the output of the matching amplifier is connected to the third input of the first switching unit. t