SU777874A1 - Device for transmitting information through telephonic lines - Google Patents

Description

one

The invention relates to communication technology and can be used in automatic telephone communication systems and devices.

A device for transmitting information via telephone lines is known, comprising a calling unit connected to a telephone line via a capacitor, a connecting unit connected to a telephone line, a matching unit, the first input and the first output of which are connected respectively to the output and input of the modulator, the second input and the second output of the matching unit is connected respectively to the output and input of the receiving unit; the third input of the matching unit is connected to the output of the connection unit and the input of the dialer unit, the output of which is connected to the third output matching unit and the input connecting unit and the generator unit 1.

However, the known device has insufficient noise immunity.

The purpose of the invention is to improve noise immunity.

To do this, a device for transmitting information over telephone lines, comprising a call unit connected to the telephone line through a capacitor, a connection unit connected to the telephone line.

line, matching unit, the first input and the first output of which are connected respectively to the output and the input of the modulator, the second input and the second output of the matching

5 units are connected respectively to the output and input of the receiving unit, the third input of the matching unit is connected to the output of the connection unit and the input of the dialer unit, the output of which is connected to the third output of the matching unit and the input of the connection unit, as well as the generator unit, the key unit and three circuits from serially connected valve block, matching element, rectifier and filter, the first inputs of the valve blocks connected to the output of the generator unit, the input of which is connected to the output of the key block, in the stroke of which is connected to the second input of the first valve block, the output of the first filter is connected to the additional input of the connection block, the output of the second filter is connected to the additional input of the diaphragm block, and the output of the third

25 filter connected to the auxiliary input of the modulator.

FIG. 1 shows a structural electrical circuit of the proposed device, FIG. 2 - diagrams explaining his work.

Device. For information transfer via telephone lines, including block 1, matching block 2, receiving block 3, block 4 connections, portable block 5, modulator 6, key block 7, heater block 8, valve blocks 9-11, matching elements 12 -14, rectifiers 15-17, filters 18-20.

The device works as follows

In the initial state, the generator unit 8 is inhibited, and the telephone channel (communication lines) is not connected through the unit 4 to the main nodes of the apparatus, which are de-energized. At the moment the voltage drop Ut (Fig. 2, plot "a) arrives at the input of the key unit 7, the latter generates a signal, by which the generator unit 8 begins to generate high frequency oscillations, the voltage from the output of which goes to the first inputs of the valve units 9-11 . Our second inputs are received respectively: a signal-imitation of a tube lifting, voltage t / jv (Fig. 2, diagrams "d) dialing numbers and information signals Ui (Fig. 2, diagrams" das). The stresses Ljv and Ui affect the operation of the telephone apparatus only in the presence of voltage,

Pg Io the moment the voltage UT enters the INPUT of the valve unit 9, the latter passes oscillations (Fig. 2, plot "b) of the generator unit 8 to this output. This voltage is fed through the matching element 12 (with a transformer coupling at the output) to the rectifier input 15, after detection, is smoothed by filter 18 (Fig. 2, plot "e) and is fed to the control inputs of the connection unit 4. The latter at the same time connects the communication line with the main nodes of the telephone set, simulating the operation of lifting the handset. In this case, it becomes possible to carry out the operation of automatically dialing the number of the subscriber. To this end, the voltage f / w (pulses with a follow-up period of 100 ms and a duration of 40 ms) is fed to the second input of the valve unit 10, which at the input forms bundles of sinusoidal oscillations (Fig. 2, plot "5") coming through the matching element 13 to the input of the rectifier 16, the load of which is the filter 19.

From the output of the filter 19, the smoothed f / f pulses (Fig. 2, plot "e) arrive at the control inputs of the dial pad 5, which, by switching the current in the communication line, transmits dialing code signals to the PBX. In this case, the operation of connecting with the called subscriber (for example, measuring information

system). After calling and connecting the subscriber to the LPP, analyzing its state, it becomes possible to carry out the operation of transmitting information by the method of pulse code modulation (PCM).

To this end, the voltage 6 // (Fig. 2, plot "g) is fed to the second input of the valve unit 11, which forms at the input (Fig. 2, plot" h) U1 oscillation packs with frequency generation of the generator unit 8. This is The UI enters through the matching element 14 to the input of the rectifier 17, the load of which is the filter 20. From the output of the filter 20, the pulses smoothed in shape (Fig. 2, plot "U) with a duration and period corresponding to the parameters of the information signals are sent to module inputs to-. 6, acting on the telephone channel (current modulation) and implementing the operation of transmitting information signals to the line.

Claims (1)

Invention Formula A device for transmitting information via telephone lines, comprising a call unit connected to the telephone line via a capacitor, a connection unit connected to the telephone line, a matching unit, the first input and the first output of which are connected respectively to the output and input of the modulator, the second input and the second the output of the matching unit is connected respectively to the output and input of the receiving unit; the third input of the matching unit is connected to the output of the connection unit and the input of the dialer unit, the output of which is connected to the third output the matching unit and the input of the connection unit, as well as the generating unit, characterized in that, in order to increase the noise immunity, a key unit and three circuits are inserted from the series-connected valve block, matching element, rectifier and filter, the first inputs of the valve blocks are connected to the output of the generator unit, the input of which is connected to the output of the key unit, the input of which is connected to the second input of the first valve block, and the output of the first filter is connected to the auxiliary input of the connection block audio, the second filter output is connected to an additional input block of typesetting and the third filter output is connected to an additional input of the modulator. Sources of information taken into account in the examination 1. French patent L 2194093, CL. 04/06/1974 (prototype). UN UT