SU611246A1 - Apparatus for recording information onto magnetic carriers - Google Patents

Description

The invention relates to automation and computer technology and is intended for use in data storage systems of a moving magnetic HocHTev. The known device for recording information on a magnetic carrier does not discourage equal reliability with aapxy dual characters 1 and O 1. The closest to the invention of the technical solution is a device for recording information on a magnetic medium containing a shift register, connected to the information input of the device, and the elements AND and OR 23. This known device is not reliable enough. The difference between the device described here is that it contains a reversible counter and a trigger connected by a counting input to the clock channel, and the output to the subtracting input of a reversible counter, the addition input and the codes of which are connected, respectively, the input of the shift register and the first inputs of the first and second And elements connected by the second inputs to the control input of the device, and the outputs to the first inputs of the key blocks, the second inputs of which are connected, respectively, with single and zero outputs of razdovdov shift register, and the same outputs of blocks, keys are connected in pairs through the element OR to the corresponding output of the device. This makes ycTpofcrea more reliable. The drawing shows the fuvkshyuialnaya diagram of the description of the device. It contains a drop list 1, a reversible counter 2, blof 3 and 4 keys, 1TOR 5 or 5, elements AND B and 7 w (Trigger 8. The structure of each subject record. The code word is changed so that in the received by its coasma A word is dominated by a symbol, least distorted by distortions in the memory of a similar type, and using a recording unit, the prevailing code word is written onto the information carrier. The code word conversion process can be considered for the case when the original code word consists of groups of equal length and shares wow such as a & possesses, a distortion of the units.An input of the input receives codeword symbols.In a sequential code, it is entered into register 1, the size of which is equal to the group length.At the same time as the register 1 is filled with a reversible counter 2 the CHHTtjBaeTCH is the number of units entered into register 1. The subtracting input of the counter 2 is fed and pulses with a frequency twice as low as the clock frequency of the device (and the frequency is triggered by the trigger 8 with the counting input). At the sign output + of counter 2, after the last character of the group arrives, there is a high potential, if register 1 contains more than half of the records (otherwise, the high potential appears at the sign output -), After entering the last character into register 1, the group is input the impulse is counted which passes through the element AND 6 or 7 (depending on which of them is fed to the second one. High potential from the sign output of counter 2). This pulse opens blocks 3 and 4. From register 1, a group of codeword characters is read, respectively, in direct or invert form, which through the elements of PSI 5 enters in parallel code to the 1st terminal of the device. In the case of a group 1 in inverted form to one of the output terminals connected to block 4, it is understood the impulse serving: n {1 and a sign

Thus, the group is assigned a single bit fa to a private; ray}, into which a sign indicates that the given group of characters of the code word is inverted or not. With a delay of transient time, the register 1 is reset, the counter 2 is triggered by the 8 to the idle state (not shown in the drawing of the reset circuit). Upon receipt of the next corpses of the code word symbols, the processes are repeated.

Example 1, A code word consists predominantly of those Characters that are most susceptible to distortions in the memory of a given sham {for co-secrecy — of one. Let, for example, a code word be

1110111110011lioiiiioiiii101111

001111111 and I are labeled on the head of a group of ten characters. After counting

the number of units in each group (as a result, those of the joint operation of counter 2 and trigger 8) makes it clear that in this case it is necessary to invert all the groups. The word at the exit is OOOIOOOOOIOIOOOOI OOOO01000O0100OOO1OOOOOOOOO.

PRI me R 2, The code word contains an equal number of characters of both types 11110111100О00100О001101111001ОО1001О101. After counting the number of units in each lO-bit rpjTine, it turns out that it is necessary to invert the first and third groups. The word at the output is OO0010O001OOO001000001 0016000110000100101011.

The examples show that, in any case, the code word is written onto the carrier in such a way that it is dominated by a symbol that is least susceptible to distortion and, therefore, provides conditions for improving the reliability of the recording of the binary format that is stored.

Claims (2)

1. US patent number 3639900, class. 340-.146.1, 1972. 2. Japanese Patent No. 48-14374, cl. 97 (7) CO, 1973. tirod