SU1690207A1 - Device for control of busy channels of tonal frequency - Google Patents

Abstract

The device relates to telecommunications technology and can be used to control voice frequency channels without interrupting the transmission of information. The purpose of the invention is to improve the reception quality of the transmitted information by reducing the influence of control on the transmitted inLkhoE formation. The device for monitoring the occupied channels of the tone frequency contains on the transmitting side a pilot signal generator 1 and a decoupling unit 5, and on the receiving side filter filter 9, an integrator 8 and a threshold unit 7. The goal is achieved by introducing on the transmitting side detector 2, integrator 3, the threshold unit 4 and the switch 6, and on the receiving side of the barrier filter 11 of the control signal, amplifier 10, element OR 12, the detector 13. When transmitting useful information, the control of the communication channel is carried out using scheduling signal. In the pauses of the transmission of useful information, the control of the communication channel is carried out using the power of the control signal. 1 il. YayhoE I (L S O y o y u VI exit

Description

The invention relates to a telecommunication technique and can be used to control a tone frequency code without interrupting the transmission of information.

The purpose of the invention is to increase the reception quality of the transmitted information by reducing the influence of control on the transmitted information.

The drawing shows the structural electrical circuit of the device for monitoring occupied channels of tone frequency.

The device contains on the transmitting side a pilot signal generator 1, a detector 2, an integrator 3, a threshold unit 4, a decoupling unit 5, a switch 6; on the receiving side, the threshold unit 7, the integrator 8, the filter 9 of the pilot signal, the amplifier 10, the barrier filter 11, the OR element 12 and the detector 13. The drawing also shows the controlled channel 14 of the frequency.

The device works as follows.

When transmitting useful information, monitoring of the communication channel is carried out using the power of the transmitted signal. At the same time, the information signal from the device input goes to the detector 2, the integrator 3 and the threshold unit 4. The output of the threshold unit 4 (in the presence of the transmitted signal power) generates a signal arriving at the control input of the switch 6, and the control signal from the generator 1 does not served through the unblocking unit 5 to the monitored communication channel 14.

On the receiving side, the received signal is fed to the inputs of the filter 9 and the barrage filter 11. Filter 9 can be implemented as a bandpass filter with a center frequency equal to the frequency of the control signal, or a low-pass filter whose cutoff frequency is higher than the frequency of the test signal. The barrier filter 11 provides suppression of the control signal in the pass-through transmission path and can be implemented either in the form of a filter whose central frequency coincides with the frequency of the test signal, or in the form of a high-pass filter. The barrier filter 11 passes (without significant distortion) the entire received signal to the first output of the device and to the corresponding input of the element OR 12. Then, after straightening in the detector 13 and averaging in the integrator 8, the received signal arrives at the threshold unit 7, at the output of the threshold unit 7 (in the presence of a useful signal at the reception) a Norma signal is generated, arriving at the first output of the device. In the absence of a useful signal at the output at the output of the threshold unit 7, the Avariya signal is generated.

Claims (1)

In the pauses of the transmission of useful information, the control of the communication channel is carried out using the power of the control signal. At the same time, at the output of the threshold unit 4, a control signal is generated that connects the output of the generator 1 to the input of the decoupling unit 5. Thus, the control signal is fed to the input of the monitored communication channel 14. If the communication channel is healthy, the control signal via filter-p 9 and amplifier 10 is fed to another input of the element OR 12. In this case, amplifier 10 ensures that the signal power at the output of the element OR 12 is equal both in the transmission of useful information and in the transmission of the control signal . In this case, at the output of the threshold block 7, the signal Norm is formed. If the monitored communication channel 14 fails, the Avariya signal is generated. Due to the presence of a barrier filter 11, the test signal does not pass to the first output of the device. Formula of the Invention the receiving side is a pilot signal filter whose input is intended to connect the output of the monitored tone frequency channel and connected in series An integrator and a threshold unit, characterized in that, in order to improve the reception quality of the transmitted information by reducing the influence of control on the transmitted information, serially connected detector, integrator, threshold unit and switch are entered on the transmitter side, the other information input of which is connected to the generator output the control signal, and the output is connected to the input of the decoupling unit, the output of which is connected to the input of the detector and is the input of the transmitting side of the device, and on the receiving side - 3 graditelny pilot filter, the input of which is a signal input from a monitored channel tone, and the output is the first output device and serially connected amplifier, the OR gate and the detector, whose output is connected to the input of the integrator, the other input of OR gate connected to the output zagradi516902076 The filter output, the control output, and the output of the threshold unit is the second signal connected to the VHOLU -, device output.