SU1243027A1 - Device for reproducing digital messages - Google Patents

Description

The invention relates to the field of recording information media, namely, devices for reproducing digital messages.

The purpose of the invention is to reduce reproduction error.

The drawing shows a diagram of a device for reproducing digital messages.

The device for reproducing digital messages contains a detecting unit 1, connected by an input to an input pin 2 and a first output through a shift register 3 to an input of a buffer register 4 connected by imprints to the inputs of a code converter 5, the output of which is connected through the block 6 of registers to the inputs of a buffer memory 7 , the first 8 and the second 9 decoders, and the output register 10, the output of which is connected to the output bus 11. The marking output of the first decoder 8 is connected to the marking input through the first deceleration element 12 The second dec-25 is made by locking the door 9. In addition, the device comprises a comparison element 13, an OR 14 element and a second delay element 15, the comparison element 13 being connected by the first and second inputs to the inputs and outputs of the converter 5 and output to one input of the SHS 14 element, another input connected to the second output of the detection unit 1 and output through the second delay element 15 to the marking input of the first decoder 8.

The device works as follows.

The signal received by the input bus 2 is demodulated by block 1 into a sequence of channel code elements arriving at the shift register 3, which transforms the serial code into a parallel code, and if there is no erase signal, then a binary signal sequence is generated at the information output 1 in the presence of erasure (in the case of uncertainty in the value of the binary signal), a marking signal is inserted at the marking output. At the same time, the information output of the block TTC 1 gives zero elements of the channel code.

When accumulating in the register 3 the complete combination of the channel code, it is rewritten into the buffer register 4 and then converted by the code converter 5 into the corresponding code symbol. At the output of the converter 5 of the code, the multi-bit Galois field elements, which are symbols of the code detecting and correcting the grains, such as the Reed-Solokon code, are imbedded. These symbols are transmitted block by block to the inputs of register block 6, which are used to compensate for

uneven arrival of code symbols from the channel. At the same time, the comparison element 13 determines whether the code combinations are working, and in the detection of forbidden, non-working combinations of the redundant channel code, it generates a marking signal for the corresponding characters, characterizing these characters as erroneous, is transmitted through the element OR 14, through the second element 15, obsequiously, to the marking input of the first decoder 8.

You are the phenomenon of non-working combinations

The output signal from the converter of the 5 code of the zero symbol is provided that the channel code combination at the input of the converter 5 of the code is different from the combination corresponding to the zero signal. From a block of 6 registers with a constant clock frequency, the symbols are transmitted to the buffer memory 7, in which the code symbols are moved to correct the error packets.

From the storage device with a fixed delay time, the code symbols are transmitted block by block to the decoder 8, in which, based on the calculation and analysis of the syndromes and taking into account the marking signals, the presence in the code block before the interleaving of the characters with errors is determined; these errors are corrected, and the characters are transmitted back to the buffer memory 7. With a large number of 1111, side and the impossibility of ICC localization and correction in the first decoder 8, the latter returns to the memory 7 uncorrected characters and at the same time for all uncorrected code block symbols as unreliable , gives the first delay flagging element 12 to the signal; 1L.

In the second decoder 9, the characters after moving are received block by block from the storage device 7 also with a fixed delay time determined by the accepted law of movement. At the same time, the decoder 9 receives from the first element 12 the marking signals corresponding to these symbols. The second decoder 9 also, on the basis of calculating and analyzing the syndromes and taking into account the marking signals, determines the presence of error symbols in the code block, corrects them and transfers the corrected data to the memory 7, from which, through the output register 10, the sequence of symbols with very low probability errors are transmitted to the output pshnu 11,

Editor B, Petrash

Compiled by V. Dobrovolsky

Tehred M. Morgental Proofreader A. Tsko

Order 3711/52 Circulation 543Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5

Production and printing company, Uzhgorod, st. Project, 4

As can be seen, the control of the blocks of the proposed device is carried out with the help of a block, which (not shown) completes the signals of the reference clock frequency, which are synchronizing signals arriving at all nodes and ensuring their synchronous operation. In addition, in the control unit, control signals for recording information in the buffer memory 7 are aborted.

The use of the invention allows to significantly reduce the error in the reproduction of digital messages in comparison with the basic object.

Claims (1)

DEVICE FOR PLAYING DIGITAL MESSAGES, comprising a detecting unit connected by an input to an input bus and a first output through a shift register to an input of a buffer register connected by outputs to the inputs of a code converter, the output of which through a block of registers is connected to the inputs of a buffer memory, the first and second decoders and the output register, the output of which is connected to the output bus, and the marking output of the first decoder is connected through the first delay element to the marking input of the second decoder ra, characterized in that, in order to reduce the playback error, a comparison element, an OR element, and a second delay element are introduced into it, and the comparison element is connected · § the first and second inputs respectively to the inputs and outputs of the code converter and the output to one input of the OR element , another input connected to the second output of the detection unit and output through the second delay element with a marking input of the first decoder. SU ,, 1243027