SU1256088A1 - Device for digital magnetic recording - Google Patents

Abstract

The invention relates to the accumulation of information and allows you to increase the recording density of the device, which contains the elements AND 1 and 4, the element OR 5, the counting triggers 6, 10 and 3, the recording block 7, the element 11 and the converter 12 of the four-digit code into five-bit code. The introduction of new elements and the formation of new connections between the elements of the device allows the magnetic recording medium to be re-magnetized over two levels to saturation. In this way, each group of four characters selected from the input information is converted into a group of five characters in such a way that the number of next logical zeroes does not exceed two. The magnetic recording medium is re-magnetized after each odd symbol interval in a continuous sequence of intervals corresponding to the logical units of the binary code, and in the middle of the interval corresponding to the logical zero following the logical units. 2 Il. (O (L to SP O5 O 00 CX) fiz.1

Description

The invention relates to the field of information storage, namely to digital magnetic recording.

The purpose of the invention is to increase the density of a digital magnetic recording.

FIG. 1 shows the proposed device for digital magnetic recording; in fig. 2 - timing charts characterizing the operation of the device.

The device contains the first element And 1 connected by the first input to the first input bus synchronization and connected output to the counting input of the first counting trigger, the second element And 4 and the element OR 5 connected to the output of the counting input of the second counting trigger 6, block 7 records and input bus 8 information. The first input of the second element And 4 is connected to the second input bus 9 synchronization. The outputs of the second counting trigger 6 are connected to the inputs of the recording unit 7.

The device also contains a third counting trigger 10 connected by an output to the first input of the element OR 5 and connected by a setup input to the output of the second element AND 4 connected to the installation input of the first counting trigger 3, the HE element 11 and the converter 12 of the four-digit code to the five-bit code. The first counting trigger 3 is connected by a counting input to the output of the first element AND 1 and is connected by an output to the second input of the element OR 5. The HE element 11 is connected to the counting input of the third counting trigger 10. The converter 12 of the four-digit code to the five-bit one is connected to the input bus 8 and is connected by an output to the second input of the first element I 1. The output of the converter 12 of the four-digit code to the five-bit one is connected to the input of the HE element 11 connected by the output to the second input of the second element 4.

Digital magnetic recording using the proposed device is as follows.

The type code (Fig. 2a) is fed through the input bus 8 of information to the converter 12 of the four-bit code into five-bit code. The latter provides the conversion of a four-bit code to a five-bit one (Fig. 26). This five-bit code is sent to the first element I 1, accompanied by the first sequence of clock pulses (Fig. 2c) arriving via the first sync input bus 2. It also enters the second element 4, to which a second sequence of clock pulses (fig. 2d) is fed through the second input bus 10 of synchronization (fig. 2d) after the element 11 is inverted (fig. 2e). The pulses of logical units from the output of the first element And 1 (Fig. 2e) arrive at

0

five

0

0

five

0

five

the counting input of the first counting trigger 3, to the installation input of which, from the output of the second element I 4, pulses of logical zeros are applied (Fig. 2g). These pulses are also fed to the installation input of the third counting trigger 10, the counting input of which receives an inverted five-bit code from the output of the HE element 11 (Fig. 2e). The first and third counting triggers 3 and 10 form pulses (Fig. 2h, n, i) which are combined with the element OR 5 (Fig. 2k). The result of combining from the output of the element OR 5 is fed to the second counting trigger 6, which divides it by frequency into two (Fig. 2L). The phase signals from the outputs of the second counting trigger 6 are fed to the inputs of the recording unit 7, which converts them into the recording current in the magnetic head.

The digital magnetic recording by the proposed device is based on the re-magnetization of the magnetic recording carrier over two levels to saturation, in which each group of four characters selected from the input information is converted into a group of five characters so that the number of next logical zeros does not exceed two. In this case, the magnetic recording medium is re-magnetized after each odd symbol interval in a continuous sequence of intervals corresponding to the logical units of the binary code and in the middle of the interval corresponding to the logical zero following the logical units.

Claims (1)

Invention Formula A device for digital magnetic recording, containing the first And element connected by the first input to the first synchronization input bus and connected by an output to the counting input of the first counting trigger, the second And element connected by the first input to the second synchronization input bus, the OR element connected by an output to the counting input A second counting trigger connected by outputs to the inputs of a recording unit, and an input information bus, characterized in that, in order to increase the density of a digital magnetic recording, a third an even trigger connected by the output to the first input of the OR element and connected by a setup input to the output of the second element AND connected to the installation input of the first counting trigger connected by a counting input to the output of the first element AND and connected by the output to the second input of the OR element, the element NOT connected to the output with the second input of the second element I, and the converter of the four-bit code into the five-bit code connected by the input to the input information bus and connected by the output to the second input of the first el ment And, the output transducer chetyrehrazr-stand code n tirazr projectile loader code connected to the input of NOT circuit connected with the output countable counting input of the third flip-flop. i 1 O 1 7 1 O O 7 O O O 0 6  lL n JLJLJl JLJlJLJLJLJl Jl / f I p p p p Well Ti p p p p p | j-L I / P 1.5T 15G 2.5G Jl Jt lp l 2G 2.5 g G, G “-. FIG. 2