SU563740A1 - Device for automatic monitoring noise level and residual attanuation of voice channels - Google Patents

Description

a program block whose third input is connected through the chronizer to the input of the master oscillator and to the second generator input of the control frequency, the timer is connected between the third output of the program block and the auxiliary output of the signaling unit, and a low-pass filter is inserted on the receiving side of the telephone communication channel voice and a timer, with this low-pass filter, is connected to a telephone communication channel, the low-pass filter inputs are connected to the switch inputs, and the low-pass filter outputs through Lock voice control, the program timer unit and connected to an additional input of the alarm unit.

The drawing shows the structural electrical circuit of the device for the automatic control of the noise level and the residual attenuation of telephone communication channels.

The device contains on each transmitting and receiving sides of 1 (2) channel switch 3 (4) whose outputs through block 5 (6) of control and serially connected receiving filter 7 (8) and program block 9 (10) are connected to inputs of block 11 ( 12) alarm. The second output of software block 9 (10) is connected to the auxiliary input of block 5 (6) of the control, and the third output of software block 9 (10) is connected via the generator 13 (14) of the control frequency to the inputs of switch 3 (4) on the transmit side of the telephone communication channel, the master oscillator 15 through the distributor 16 channels is connected to the auxiliary input of the switch 3. In addition, on the transmitting side 1 of the telephone communication channel there is a frequency filter 17, a voice control unit 18, a clock 19 and a timer 20. The low pass filter 17 is connected to verifiable the communication channel, the inputs and outputs of the low-pass filter through the switch 3 and the voice control unit 18 are connected to the second input of the program block 9, the third input of which is connected to the input of the master oscillator 15 and the second input of the control frequency generator 13 via the clock generator 19. A timer 20 is connected between the third output of program block 9 and the additional output of block 11 of the alarm.

On the receiving side 2 of the telephone channel, there are a low-pass filter 21, a voice control unit 22 and a timer 23. The low-pass filter 21 is connected to the telephone link, the low-pass filter inputs are connected to the switch 4 inputs, and the low-pass filter outputs the voice control unit 22, the program unit 10 and the timer 23 are connected to the auxiliary input of the signaling unit 12.

The device works as follows.

When turned on, all nodes of the transmitting and receiving sides 1, 2 are reset and the master is started.

generator 15 (multivibrator), which produces triggering pulses with an interval of 40 seconds. These pulses affect the distributor of 16 channels, made according to the counting circuit, the output of which is made in binary-decimal code. The channel distributor signals are decoded and the next channel is connected via the switch 3 to the metering device (no

shown). Using the chronizer 19, the control frequency generator 13 is turned on in the transmission path of the controlled channel, which ensures the sending of a probing signal with a frequency of 33000 Hz

about 2 seconds with a stable amplitude.

From this signal, the receiving filter 8 is triggered at the receiving side 2. separating the frequency of 33000 Gu and ensuring the launch of the program block 10 and the connection of the block

6 control. Unit 6 measures the probing signal and compares it with the established tolerance.

Over the second interval required for the FULL discharge of the measuring circuit, on

block 6 is given a command from the program block 10 and the measurement of the noise level and its comparison with the tolerance begins.

After a second pause, the control

devices, software block 10 gives the command to turn on the control frequency generator 14 to send a probe signal in the direction from the periphery to the center.

Signal received by receive filter 7

the transmission side 1, starts the software block 9, and the channel measurement in the direction from the periphery to the center occurs in the order described above.

At the end of the cycle, the transmitting side

1 comes to its initial state and is expired: whether the chronizer 19 is 40 seconds using the switch 3 switches to the next channel.

If one of the parameters of the controlled channel is outside the tolerance,

program block 9 (10) acts on

alarm unit 11 (12) including light

and audible fault indications.

After each polling cycle, timers 20 and 23 are started at both ends of the channel, with an exposure time equal to two time polling cycles. If during this time the next survey does not follow (for example, if the channel is broken), a malfunction signal will be generated.

The received fault signals are recorded in the storage elements of blocks II, 12. If during the next survey it turns out that the channel has been restored, then a reset occurs.

storage elements and turning off the signal of non-weakness.

If in the process of control the channel is occupied by negotiations, then the voice control blocks 18, 22 lock the control blocks 5. 6,

dropping software blocks 9, 10.

If two consecutive monitoring cycles are missed due to the busy channel, then the timers 20, 23 on both ends of the channel generate a "Channel occupied" signal. In this case, a fault signal is not generated, since the presence of a radio channel on the channel indicates its good health.

Automatic monitoring of telephone communication channels makes it possible to prevent channel failures prior to the commencement of a communication session, to reduce the probability of a delay in receiving a communication channel, and to reduce the time for a simple channel.

Claims (2)

1. USSR author's certificate No. 277021, cl. H 04B 3/04, 1969. 2. USSR author's certificate number 375805 class. H 04B 3/04, 1970.