SU788424A1 - Discrete signal transmitting/receiving device - Google Patents

Description

(54) DEVICE FOR RECEPTION AND TRANSMISSION OF DISCRETE SIGNALS The invention relates to telecommunications and can be used in electro-mechanical telegraph devices and data transmission equipment. A device for receiving and transmitting discrete signals is known. The keypad is connected to the control unit 1. However, the known device has a low reliability of the received information. The purpose of the invention is to increase the reliability of the received information. To achieve this goal, the well-known device for receiving and transmitting. The discrete signals are entered into the accumulator, the distortion input unit and the shift register, while the outputs of the information input unit are connected to the transmitting distributor through the accumulator, another output of the switching unit the first input of the shift register, the outputs of which are connected to the accumulator inputs, in addition, the output of the transmitting distributor is connected to the second input of the shift register and to one input of the distortion input unit The other output of this unit is connected to the corresponding input of the output relay. FIG. 1 shows the structural electrical circuit of the proposed device; in fig. 2 - diagrams explaining his work. The device for receiving and transmitting discrete signals contains an information input unit 1, a storage unit 2, a transmitting distributor 3, an output relay 4, a switching unit 5, a distortion insertion unit 6, a shift register 7, a receiving dialer unit 8, a control unit 9. The device works as follows. When installed on the switching unit 5, the mode of "receiving and transmitting by a signal from its additional output blocks the operation of the block 6 for introducing distortions, which in

This state, in turn, blocks the operation of register 7.

The code combination from block 1 is entered by a parallel code into a multistage drive 2, and from there a parallel code is fed into the transfer valve 3. Here it is converted from parallel to serial with the addition of service elements.

From the output of the transmitting distributor 3, the code combination is supplied with a serial code to the inputs of the output relay 4, block 6, register 7. The operation of block 6 and register 7 in this mode, as already noted, is blocked.

The output relay 4 generates binary electric signals of a given amplitude in accordance with the code combination arriving at it and sends them through the switching unit 5 to the line and to the input of the receiving keypad 8. The latter records the information elements of the code combination, accumulating them before the end of reception of the entire code combination . After that, the received code combinations are transmitted by a parallel code to control unit 9, which generates executive commands in accordance with the received combination.

In the quality control mode of operation of the receiving dialer 8, i.e., in the monitoring mode of correcting ability for edge distortions or crushing, which is established by the switching unit 5, the blocking signals from block 6 and register 7 are removed.

Before the test text is written, multistage drive 2 is supplied with a signal from block 1, which prohibits the reading of combinations from drive 2 during the writing of text into it.

After this signal is sent to drive 2, a test text is written.

After writing the test text, the signal is removed, blocking the reading of the combinations from accumulator 2. From this point on, the code combinations in the sequence of their recording are sent from accumulator 2 to the transmitting distributor 3, which in the described manner supplies them to the inputs of the output relay 4, block 6 and register 7. From each code combination entering block 6, they select ideal modulation moments (Fig. 2; a, b, c). In accordance with the type of distortion switching installed on block 5, block 6, at fixed moments with respect to the selected ideal modulation moments, outputs to the auxiliary input of the output relay 4 pulses distorting the transmission of the transmitted code combination. The duration of these pulses is determined by the set amount of distortion. FIG. 2 (g, d) shows, for example, the introduction of edge distortion of the NII, and in FIG. 2 (e, g) shows the introduction of distortion type crushing.

The distorted code combination through the switching unit 5 is fed to the input of the receiving dial pad 8, where it is registered and a parallel code is fed to the control block 9.

If the operability (correcting ability) of the receiving dialer unit 8 is within the norm, then the commands generated by the control unit 9 will correspond to the test text symbols and vice versa, if the correcting ability of the node 8 is below normal, then the commands generated by the control unit 9 are not will match the characters of the test text, the reproduced text will be distorted.

For a qualitative assessment, the correcting ability of node 8 needs to be repeated the test text many times. The register 7 serves for this purpose. The elements of the code combination supplied to its input from the output of the transmitting distributor 3 accumulate in it. When writing the last element of it, the code combination in parallel code through the outputs of the transmitting distributor 3 is recorded again in the accumulator 2. Similarly, each subsequent combination of the test text is restored in the accumulator 2. Thus, recovery of the undistorted test text and its multiple transmission is ensured in drive 2.

At the end of the monitoring, on the switching unit 5, the "receive-transmit" mode is set again. At the same time, the operation of block 6 and register 7 is again blocked. The operation of the device again proceeds as described.

Claims (1)

Invention Formula A device for receiving and transmitting discrete signals containing an information input unit, a transmitting distributor, an output relay, a switching unit, a receiving dialer, a control unit, and the output of the transmitting distributor is connected via an output relay to the input of a switching unit, one output of which through the receiving dialer Connected to the control unit, characterized in that, in order to increase the reliability of the received information, a drive, a distortion insertion unit and a shift register are entered into it, while the outputs of the input block are and information through the accumulator is connected to the inputs of the transmitting distributor, another output of the switching unit is connected via the distortion input unit to the first input of the shift register, whose outputs are connected to the accumulator openings, in addition, the output of the transmitting distributor is connected to the second input of the shift register and to one input of the insertion unit distortion, another output of this unit is connected to the corresponding input of the output relay. Sources of information taken into account in the examination 1. L. Kopnichev, I. Leshchuk. Documentary communication, M., “Sv, 1977, p. 73-78 (prototype). P Yu. well