SU738182A2 - Device for automatic monitoring of the state of communication channel by noise level and residual attenuation - Google Patents

Description

On the transmitting side, the first consecutively connected unit, the transmitting unit, the information transfer rate converter, the modulator and the first additional key amplifier, the divider of the time interval and the connected banning unit, the second additional key amplifier, the demodulator, the second unit of the pa ti, the transducer of the magnitude of the speed of receiving information, while on the transmitting side another input of the first additional key amplifier is connected to another output of the first block, on the receiving side, the other input of the second additional key amplifier is combined with the input of the prohibition unit, the output of which is connected to the first input of the time interval divider, another input of the transducer of the information reception rate is connected to another output of the second memory unit, the other input is connected to another input of the first memory unit, the output of the first additional key amplifier is combined with the output of the key amplifier, the second and third inputs of which are connected to the second input, respectively, Disconnected to the output of the DC amplifier of the residual attenuation measurement path, and the third output of the first memory block, the input of the inhibitor block is connected to the output of the power distributor, and the output of the first and second inputs of the time divider are connected respectively to the output and the third input of the electronic switching cascade and with the input of the buffer cascade.

The drawing shows a structural electrical circuit of the device described.

The device for automatic control of the state of the communication channel by noise level and residual attenuation includes a control frequency generator 1, a key amplifier 2, a power amplifier 3, filters of the upper 4 and lower 5 transmission frequencies, filters of the upper 6 and lower 7 frequencies of reception, preliminarily amplifier 8, power distributor 9, residual attenuation measurement path, which includes serially connected key amplifier 10, threshold unit, 11, buffer stage 12, inverter 13 and delay unit 14, amplifier limiter 15, f 16 clocks, cascade 1 electronic switching, standby multivibrator 18, amplifiers 19 and 20 direct current, electronic switching cascade control unit 21, noise level measurement path formed by key amplifier 22, threshold unit 23 for measuring noise level, block 24 delay, element OR 25, first

additional key amplifier 26 modulator 27, converter 28 values of information transfer rate, first memory block 29, terminal 30 for connecting a digital information transmission device, second additional key amplifier 31, prohibition block 32, demodulator 33, second memory block 34, converter 35 values of the speed of reception of information, the terminal 36 of connecting the device for receiving digital information and the divider 37 of the time interval.

The device works as follows.

When operating in the control mode, the control frequency signal with a highly stable amplitude from the output of the control frequency generator 1 through the key amplifier 2, the power amplifier 3 and the high-pass filter 4, which together with the low-pass filter 5 provides the control subchannel, is transmitted to the communication channel .

On the receiving side of the control signal through the filter 6 of the upper frequencies of the reception and the pre-amplifier 8 is supplied to the power distributor 9. From the output of the latter, the control signal through the limiting amplifier 15 and the driver of 16 clock pulses is applied to the electronic switching stage 17. From the output of the prohibition block 32 in this mode of operation of the device, an authoritative PB is issued to the input of the control circuit of the time interval divider 37. Due to this, the electronic switching cascade 17 is in the working state, and the time interval divider 37 is locked.

The electronic switching stage 17 operates on the principle of frequency division with the selected division factor,

As a result, from the output of the cascade 17 of the electronic commutation to the waiting multivibrator 18, a control pulse is applied through a strictly defined I interval of time. The waiting multivibrator 18 tilts and, through the amplifiers 19 and 20 of the direct current, supplies the locking potential to the key amplifiers 10.2 and the unlocking potential to the key amplifier 22 and using the threshold unit 23 to measure the noise level. After the standby multivibrator 18 returns to its original state, the measurement process is repeated.

Consistent measurement mode switching is provided by synchronizing the operation of the switching stages of control devices located at the receiving and transmitting sides of the control subchannel. In this device, this is ensured by using a frequency divider of the electronic switching stage 17. In order to eliminate the so-called false synchronization, the control unit 21 ensures the return of the electronic switching stage 17 to its original position at each opening; the control stops or disappears. Thanks to this synchronous ra-. A bot of electronic switching cascades located on different sides of the channel is provided in a manner similar to that used in start-stop systems.

In order to avoid false switching of the channel during periods of the pilot signal removal for the time of noise measurement, a blocking potential is applied to the buffer cascade 12 from the output of the DC amplifier 19.

In order to avoid false switching to the backup channel during short-term losses of the pilot signal, delay blocks 14 and 24 are introduced, through which control pulses are sent to the OR 25 element, to the output of which the switching unit actuator is connected.

In order to exclude the receiving of digital information, when measuring the residual attenuation, the pilot signal on the receiving side of the channel is also fed to the input of the prohibition unit 32, which locks the second additional key amplifier 31.

When operating in a combined mode, digital information is exchanged only at intervals of residual attenuation measurement, i.e. about 50% of the time. In this case, the residual attenuation of the channel is monitored in the process of transmitting digital information on the levels of the pressing and releasing signals.

The code patterns received from the digital information transmission device through the clamp 30 are fixed by the first memory block 29. Information is transmitted to the communication channel at a double speed, which is provided by the information rate converter 28. If the moment of the beginning of the digital information transmission turned out to be in the interval in which the noise level is measured, then the locking potential is fed from the output of the DC amplifier 20 to the control input of the first memory block 29, as a result of which information is accumulated in it Converter input 28 of the transmission rate.

At the same time, the locking potential from the output of the DC amplifier 20 is also supplied to the control input of the second memory block 34, as a result of which false information is accumulated in it.

Upon completion of the measurement cycle of the level, the Schuhazatpayryushchy potential from the side of the DC amplifier 20 is removed and the signal from the first memory block 29 unlocks the first key amplifier 26.

As a result of this, the information, compiled in the first memory block 29, through a transmitting unit 28 of the transmission rate, the modulator 27, the first key amplifier 26, the power amplifier 3 and the high pass filter 4 are transmitted to the communication channel equal to the signal level of the control system frequency.

five

From the output of the communication channel, tone signals with frequencies on SATI and release are fed to the input of the receive bass filter and then through the preamplifier 8 and the power distributor 9 are transmitted to the inputs of the key amplifiers 10, 22 and 31, and 15 and prohibition unit 32. Lastly, these signals are perceived as interference and

5, the control input of the second key amplifier 31 is given a inhibit signal, with the result that it is open.

With the PS of the threshold unit 11, as in the previously discussed mode, residual attenuation is measured by the levels of the pressing and unloading signals, accompanying the transmission of digital information.

From the output of the second key force of the bodies 31, the said signals through de. the modulator 33 is supplied to the input of the second memory block 34. Further, through ni) e-generator 35 of the magnitude of the speed of reception of information, providing

0, the transmission rate is reduced by a factor of about two, they are transmitted to a digital information receiving device via clamp 36.

45

Claims (1)

Invention Formula A device for automatically monitoring the state of a communication channel by noise level and residual attenuation by aut. St. 277021, characterized by the fact that, in order to increase the capacity of the communication channel by transmitting digital information on the control subchannel without disturbing the automatic control, the first memory block, the information transfer rate converter, are inserted on the transmit side, the modulator and the first additional key amplifier, on the receiving side of the time interval divider and successively connected blocking block, the second additional key amplifier, demodulator, in the second the memory unit, the converter of the magnitude of the information reception speed, while on the front side another input of the first additional key amplifier is connected to another output of the first memory, and on the receiving side another input of the second additional key amplifier is combined with the input of the prohibition unit , the output of which is connected to the first input of the time divider, and another input of the converter, the information reception speeds are connected to another output of the second memory block, the other BXOJ5 of which is connected to d ugim input of the first memory block. the output of the first additional key amplifier is combined with the output of the key amplifier, ITEL, the second and third inputs of which are connected respectively to the second input connected to the output of the DC amplifier of the residual attenuation measurement path, and the third output of the first memory block, the input of the prohibition block is connected to the output power distributor, and the output and the first and second inputs of the time divider are connected respectively with the output and the third input of the electronic switching cascade and with the input of the buffer cascade.