SU767996A1 - Method for transmitting digital data - Google Patents

Description

(54) METHOD FOR TRANSFERRING DISCRETE INFORMATION

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The invention relates to radio engineering and can be used when transmitting information over asynchronous-synchronous communication channels.

A known method of transmitting discrete information, based on the conversion of asynchronous start-stop signals into synchronous signals with the exception of start and stop parcels on the transmitting side and on the conversion of synchronous signals into asynchronous start-stop signals with the restoration of starting and stop parcels on the receiving side 1.

However, the known method does not provide sufficient noise immunity in the transmission of information.

The purpose of the invention is to improve noise immunity.

For this, according to the method of transmitting discrete information based on the conversion of asynchronous start-stop signals into synchronous signals with the exception of start and stop parcels on the transmitting side and on the conversion of synchronous signals into asynchronous start-stop signals with the restoration of starting and stop parcels on the receiving side The transmitting side is analyzed by a synchronous signal, the control signal is extracted, a service signal is generated corresponding to the control signal, and transmitted in breaks and steps. Zech between transmitting synchronous signals to the occurrence of the next control signal, and a synchronous signal is analyzed at the receiving side, the service signal is isolated and forming a control signal; in addition, on the transmitting side, the service signal is formed from two synchronous signals, the first of which does not coincide with any of the information signals, and the second is identical to the control signal; at the receiving side, each received control signal is compared with the previously

5 by the received control signal and, with their difference, the next received control signal is used.

The drawing shows the structural electrical circuit of the device for implementing

„The proposed method.

The device comprises on the transmitting side a start-stop receiver I, a packet 2 transmitter, a synchronous transmitter 3, an analyzer 4 transmissions and a driver 5

service combinations, communication channel 6 and at the receiving side — a synchronous receiver 7, a reception drive 8, a start-stop transmitter 9, a reception analyzer 10, and a control unit 11.

The essence of the method is as follows.

The method involves the following order of operations.

On the show:

- conversion of code asynchronous signals with a start-stop cycle into code signals with a shorter synchronous cycle;

- after the operation of converting an asynchronous signal to a synchronous signal, the latter, together with its transmission, is analyzed, the control pattern coding patterns are recognized in it;

- each of the code combinations of control signals before the occurrence of the next such combination is memorized;

-in pauses form and transmit a service signal; .

- the structure of the signal in the course of the transmission changes according to the stored next combination of the next control signal. At the contact:

-reversely converting the code signals with a synchronous cycle into code signals with a longer start-stop cycle; , - before converting the synchronous signal 6. along with its reception, analyze and

recognize the service signal in it;

- are extracted from the service signal and the control signal code combination is fixed, according to which the specified mode of operation of the receiver is established, after which the information reception is allowed.

The proposed method also envisages the order of the operations on the formation of a service signal, namely: in transmission, as well as intervals, resulting from shortening the initial start-stop code signals during their conversion to synchronous, are divided into intervals equal to the transmission time of the two combinations of code synchronous signals, and fill them with a service signal;

-first service signal combination is a signal that does not coincide with its structure with any part of the stream of information code signals; .-....

The second signal combination is the pre-memorized combination of the control signal that was transmitted last.

In addition, the method provides for receiving a ban on latching control signals contained in the service signal and coinciding with those previously recorded.

The essence of this operation consists in the fact that after the first service signal has been established, a given receiver operation mode, for example, a given telegraph register, is no longer necessary to confirm this mode, since it changes during the transmission. Therefore, latching of subsequent control signals contained in the overhead signal can be prohibited.

On the other hand, the control signal contained in the information sequence may be affected by interference in the communication channel. In this case, the telegraph will not work properly until the next control signal is received. At the same time, during this period of time, a service signal will be received, which contains the last control signal and by which the device can be put into the correct mode of operation, without waiting for the next control signal. Therefore, the control signal contained in the service signal is compared with the memorized last control signal and, if it coincides, its fixation is prohibited, and if it does not match, it is fixed.

A device for implementing the proposed method works as follows.

Information in the form of start-stop code combinations from the telegraph apparatus is fed to the input of the start-stop receiver 1, in which it is received and registered. From the start-stop receiver, the information enters the drive 2, which stores the received information for a certain time. The synchronous transmitter 3 adjusts the process of retrieving information from storage device 2 and transmitting it to channel 6 in the form of synchronous code combinations, obtained, for example, as a result of impulse conversion (7.5-bit initial start-stop combination is converted into 5-bit synchronous).

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In parallel with the transmission, analyzer 4 analyzes the synchronous signal, remembers the combination of the last control signal (for the telegraph apparatus, a combination of one of the registers: Russian, Latin, numbers). When a pause in the transmission occurs, the shaper 5 generates a code signal corresponding in structure to the service signal.

At the reception, the synchronous receiver 7, the accumulator 8 and the start-stop transmitter 9 perform the inverse conversion of the synchronous signal to the start-stop signal, which, on the output of the start-stop transmitter 9, steps to the telegraph unit. In addition, the analyzer 10 analyzes the synchronous signal extracted from. his service signals, the first of which unit 11 starts the start-stop transmitter 9, and begins receiving information.

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Claims (3)

1. A method of transmitting discrete information based on the conversion of asynchronous start-stop signals into synchronous signals with the exception of starting and stop parcels on the transmitting side and on the conversion of synchronous signals into asynchronous start-stop signals with restoring start and stop parcels on the receiving side, differing from that, in order to improve noise immunity, a synchronous signal is analyzed on the transmitting side, a control signal is extracted, a service signal is formed corresponding to this signal alu controlling and transmitting it breaks and pauses between the transmission of the synchronous signal until a next uprableni signal, and synchronous reception side analyzed sig767996 cash, allocate a service signal and form; control signal. 2. The method according to claim 1, characterized in that on the transmitting side, the service signal is formed from two synchronous signals, the first of which does not coincide with any of the information signals, and the second is identical to HOG; 3. Method according to paragraphs. 1 and 2, characterized in that at the receiving side each received control signal is compared with the previously received control signal and 0 their differences use the next received control signal. Sources of information taken into account in the examination 1. V. Gurov. Transmission of discrete information and telegraph. M., “Holy, 1969, p. 182-185 (prototype).