SU1341728A1 - Session communication terminal receiving device - Google Patents

Abstract

The invention relates to a communication technique and increases the reliability of reception. The device contains an input matching unit 1, unit 2 receiving a signal of synchronous start, dekodi-; the decoding unit 30, the decoder 4 of the message termination signals, the memory unit 5. The two counters 6 and 7 are reintroduced. The effectiveness of the invention is to prevent the user from entering false information. Due to this, conditions for a more optimal selection of parameters of the synchronous trigger signal are provided, which increases the likelihood of its reception, and the loss of communication sessions that coincide in time with false communication sessions is reduced. 2 Il. (L (Rye.1

Description

The invention relates to the field in the field and can be used in the final session communication equipment. The purpose of the invention is to increase the reliability of reception.

FIG. 1 shows the structural and electrical circuit of the device; on ig. 2 - stress diagrams for his work.

The device contains an input matching unit 1, a unit 2 for receiving a synchronous start signal, a decoding unit 3, a decoder 4 for a message termination signal, a block 5 of memory, the first 6 and second 7 counters.

The device works as follows.

The information encoded by the redundant code is transmitted by the sessions. The necessary components of the session structure are the synchronous trigger signals, the information part of the session, redundancy coding, and the message End of Message. Redundant coding is used to detect errors.

In the input matching unit 1, amplification and limitation of the sequence of pulses coming from the channel and clock synchronization are provided. From the output of the input negotiating unit 1, a sequence of pulses is fed to the unit for receiving the signal of synchronous start 2 (Fig. 2a). The synchronous start signal, which is across the test segment, arrives at the decoding unit 3 and determines the start of processing by the decoding unit 3 of the sequence of pulses, following the synchronous start signal, by blocks in accordance with the received redundant codes (Fig. 26).

In decoding unit 3, it produces 45 than when forming a communication session from

analysis for the presence or absence of errors in code combinations within the limits of the possibility of error detection by the excess code. If the received code combination belongs to the allowed subset, then a sequence of information pulses of the code combination is written from the output of decoding unit 3 to memory block 5 (Fig . 2l) If the received code combination belongs to an unresolved subset, then an error signal appears at one of the outputs of decoding unit 3 (Fig. 2d)

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and the information in memory block 5 is not output.

Upon reception of the signal End of the message, the signal from the decoder 4 of the signal of the end of the message (Fig. 2k) is terminated in the session communication receiver to its initial state, and the received message from the memory block 5-10 is output to the consumer. In case of channel distortion due to command interference. The end of the message is reset to the device after block 5 is filled.

15 memories.

Information output from memory block 5 may be carried out depending on the requirement for a particular receiving receiver of an active communication, for example, by an operator command manually, at certain intervals from the registration device or computer complex. After filling in block 5

25 of the memory, the first counter 6, connected by one of its inputs to the decoding | rune unit 3, counts the total number of code combinations of the interfering code arriving at de30 coding unit 3 (Fig. 2e). The second counter 7, which is connected by one of its inputs to the output Error of the decoding unit 3, registers the number of distorted code combinations of the security-protected code (Fig. 2e).

A positive effect is achieved by selecting, depending on the readings of the counters, the operation mode of the end receiving device of the c40 communication. It uses the fact that the number of barred code combinations that appeared in the true session under the influence of interference in the communication channel is always less,

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interference.

The capacity of the first and second counters 6 and 7 is selected from the following considerations.

The capacity of the first counter 6 must be several times smaller than the number of code combinations of the interference-free code transmitted in one communication session. At the same time, the product of the capacity of the first counter 6 by the time of the length of the code combination of the dimmable code must somewhat exceed the most probable lengths of the error bursts for the given communication channel. The capacity of the second counter 7 is selected depending on the capacity of the first counter 6 and the redundancy of the enclosed code.

With the passage of a true communication session, the session receiving terminal operates as follows.

After 3 code combinations (Fng. 2c) arrive at the decoding unit 3, the first counter b is filled (FIG. 2d) and the signal from its output (Fig. 2g) goes to the second counter 7, while blocking the record in the first and second is session losses connections that match

on time with false sessions.

Claims (1)

Invention Formula The final receiving device is in view of the fact that the communication session is true-20 communication. counters 6 and 7, and sets the second counter 7 to the zero state. containing a signal termination decoder and a serially connected input matching unit, a unit for receiving a synchronous trigger signal, decoding the output does not appear to be controlled — a 25 block and a memory unit, the output blonish, the second counter 7, by the time the signal arrives from the first counter 6, it is not completely filled even when it is installed in the zero-biasing signal (Fig. 2n). Therefore, the decoding unit 3 continues to process incoming session code combinations arriving at it. When receiving a signal The synchronous start signal receiving signal is connected to the input of the end signal decoder signal, characterized in that The end of the message by the decoder 4 Sig-ZO to increase the reliability of reception, entered the end of the message, the device is brought to its initial state (Fig. 2k). This unlocks the first and second counters 6 and 7 (Fig. 2g, 3). In case of a false opening of the device by the time the signal arrives from the first counter 6, the counter 7 will be filled. Therefore, when it is set to the zero state, a control signal is generated at the output, with which the main units of the device, as well as the first and second counters 6 and 7, are reset. In this case, the allowed code combinations dialed from the noise and recorded in the memory block 5 are erased and not delivered to the consumer. As a result, the processing of a false session is stopped and the device is ready to receive the next session. If a true session begins immediately after the signal from the second counter 7, it will not is lost because the device is not busy processing a false session timed by the maximum amount of session received for this receiver. The effectiveness of the use of the proposed device is that the introduction of false information to the consumer is excluded. Due to this, conditions are provided for a more optimal selection of parameters of the synchronous trigger signal to increase the likelihood of its reception and decrease. The synchronous start signal receiving signal is connected to the input of the end signal decoder signal, characterized in that five 0 five 0 the first and second counters are given, the counting inputs of which are connected respectively to the second and third outputs of the decoding unit, while the output of the first counter is connected to its first control input and the first control input of the second counter, whose output is connected to its second control the input, the second control input of the first counter, the second inputs of the synchronous start signal receiving unit, the decoding unit and the memory block, the output of which is connected to the third inputs of the synchronous start signal receiving unit the decoding unit and the third control input of the first and second counters and the output signal of the decoder termination message is connected to the third input of the memory chetvertm input signal receiving unit and the synchronous start decoding unit and the fourth control input of the first and second counters. t3U5i a 4 Compiled by 0, Andrushko. Editor I. Casarda Tehred I.Popovich Proofreader M. Sharoshi Order 4445/57 Edition 638 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4