SU454554A1 - Device to control the transmission of information - Google Patents

Description

(54) DEVICE FOR THE CONTROL OF INFORMATION TRANSFER

of the encoding circuit 1, the received code word passes to the first output 11 of the proposed device and through the fourth group of OR 8 circuits to the input of the decoder circuit 2, from the second output of which the information word is output through the second group of OR 6 circuits to the input of the multi-digit comparison circuit 4. Decoded code bit word is compared by a multi-bit comparison circuit 4 with an information word received from AU 13. The coincidence of the contents of all bits of information words indicates the absence of failures (malfunctions) in the coding second decoding scheme 1 and scheme 2, and the contents of the individual mismatch bits corresponds to the presence of failures (failures).

If a failure occurred in one of the bits of the decoding circuit 2, and the encoding circuit 1 works normally, then the decoded word contains an error in one of the bits whose position corresponds to the bit of the decoding circuit 2 where there is a failure. In this case, the signal from the output of the multi-bit comparison circuit 4 shows a discrepancy in one bit, the number of which indicates the location of the error.

If, due to the incorrect operation of coding scheme 1, the code word at its output contains an error in one of the bits, then when using information such as Hamming, for control, this error will be corrected and the signal from the output of the multi-bit comparison circuit 4 will show a match in all bit dah. The indication in the decoding circuit 2 of the correction signal will make it possible to establish the presence of a malfunction in the coding circuit 1 and, in addition, to correct the error that occurred in the code word. If the error rate exceeds the correction ability of the decoding circuit 2, then the decoding circuit 2 generates the signal "Unrecoverable error, which indicates a malfunction of the encoding scheme 1.

When reading, the code word outputted from memory 14 to the second input 10 of the proposed device enters through the fourth group of OR 8 circuits into the multi-bit comparison circuit 4 and through the third group of OR 7 circuits to the input of decoding circuit 2. From the first output of decoding circuit 2, the information received the word passes to the second output 12 of the proposed device and through the first group of OR 5 schemes to the input of coding circuit 1, from the second output of which the code word is output through the second group of OR 6 circuits to the input of the multi-bit comparison circuit 4. Again the bit code word considered is compared by a multi-bit comparison circuit 4 with a code word received from memory 14. The coincidence of the contents of all codeword bits indicates the absence of failures (failures) in coding circuit 1 and in decoding circuit 2, and the mismatch of the contents of individual bits - about the presence of failures (failures).

If one of the bits of the coding scheme 1 failed during the correct operation of the decoding scheme 2, the newly received code word contains an error in one of the bits whose position corresponds to the bit of the coding scheme 1 where there is a failure. In this case, the signal from the output of the multi-bit comparison circuit 4 shows a discrepancy in one bit, the number of which indicates the location of the error.

If, due to the incorrect operation of the decoding circuit 2, the information word at its output contains an error in one of the bits, then the newly received code word differs from the code word read from memory 14, at least in a bits (where a is the minimum code word). the distance of the code used). For example, if a Hamming code with a minimum code distance of a 3 is used, then if the information word obtained at the output of decoding circuit 2 does not match the true information word in one bit, the newly received code word will differ from that read from memory 14, at least , in three bits, namely one - in the information part of the code word and two - in its control part. The discrepancy between the bits of the information part of the code word and the simultaneous mismatch of the bits of the control part, detected by the multi-bit comparison circuit 4, indicates that the decoding circuit 2 has a malfunction. Do not correct the error. Thus, in the proposed device

It is possible to control the operation of the encoding and decoding schemes both when reading information and when writing it, and also to correct errors that occur both in the encoding and in the decoding schemes.

Subject invention

A device for controlling the transmission of information, comprising encoding and decoding circuits, an indication and control circuit, a multi-bit comparison circuit, the first group of OR circuits, the first input of the device through the first group of OR circuits connected to the input of the encoding circuit,

the output of which is connected to the first output of the device, the second output of which is connected to the first output of the decoding circuit and through the first group of OR circuits to the input of the coding circuit, and the output of the multi-bit

The comparison circuit is connected to the input of the display and control circuit, characterized in that, in order to expand the functionality of the device, it comprises the second, third and fourth groups of circuits

OR, the second output of the coding circuit through the second group of OR circuits is connected to the first input of the multi-bit comparison circuit, the second input of which is connected to the device inputs through the third group of OR circuits, the second input of which is connected to the input of the decoding circuit via the fourth OR circuit input, the second output of which is connected through the second group of OR circuits to the first input of the multi-bit comparison circuit, and the first output of the encoding circuit is connected via the fourth group of OR circuits to the input of the decoding circuit.