SU1422242A1 - Method of recording digital information on magnetic carrier - Google Patents

Abstract

The invention relates to magnetic recording, in particular, methods for recording digital information on magnetic media. The invention makes it possible to increase the reliability of recording - reproducing digital information without reducing the recording density on a magnetic medium (H). According to the method, digital code signals are divided into consecutive groups of three bits, the first two bits are recorded in the first clock interval by changing the magnetization (IN) or the absence of the IN on the parallel tracks H in accordance with the signals "1 and" O, and the third bit The g of the group is recorded in the second clock interval by the ID on both tracks H in accordance with the signal "O and IN on one track B according to the signal" 1. When recording the group "001, its value is inverted and the last bit (" O is recorded as a missing ID on both tracks H). 1 ill., Table. 3

Description

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The invention relates to the field of magnetic recording, in particular, to methods of recording: digital information on a magnetic carrier. Ce: 1Y () of the invention is to improve the recording accuracy.

The drawing shows time diagrams, but they remove the essence of the method of nitrous information on a magnetic carrier.

Diagram a shows the sequence of recorded digital information divided into groups of three bits; in biv diagrams, the change in the magnetization of the posit5G in two tracks upon the implementation of the proposed recording method.

According to the recording method, a digital code is divided into groups of consecutive groups of three bits (a diagram, where Roman numerals denote serial numbers of consecutive groups). The first bit of each group is recorded in the first clock interval by changing the carrier magnetization on the first track in accordance with the signal of the first discharge unit and there is no change in the carrier magnetization in accordance with the zero signal. . The second bit of each group on the second carrier track in the first clock interval (diagrams a, b, and) is similarly recorded. The third bit of each group is recorded in the second clock interval by simultaneously changing the carrier magnetization on both tracks in accordance with the zero signal and changing magnetization only on one of the tracks in accordance with the signal unit. When recording the signal of a unit, the change in magnetization is made on the track on which no change in magnetization was made in the first clock interval, or on any of the carrier tracks, if in the first clock interval the change in carrier magnetization was done in parallel on both tracks. The presence of the code group 001 is also determined, the recording of which in the manner described leads to the absence of changes in the carrier magnetization on the second track during both clock intervals, and its inverse software value is recorded on the magnetic carrier, the last bit of which is recorded as magnetization without changes both tracks, which indicates the recording of the inverse value of the code group (for all other code combinations of the three bits for the proposed method, in the second clock interval there is tourists not mepshe one variation of the magnetization in the two carrier paths).

The table shows all the code combinations of the three binary bits and indicates the presence (under the symbol "1) and the absence (under the symbol" O) of the change in magnetization on two tracks of the carrier.

000

001

010

011

100

101

110

111

01 01 10 10 01

eleven

01 10

eleven

01 10 01

11 11 11

ten

It follows from the table that there is no such code for which there can be more than one absence of changes in the carrier magnetization on each of the two tracks. This property of the proposed method provides a significant narrowing of the energy spectrum of the recording signal

Claims (1)

Formula of invention The method of recording digital information on magnetic media by recording the signals of units and zeros of the digital information code on two tracks by reversing 5 magnetic media, and before recording, the digital code signals are divided into successive groups of signals of three binary bits and recorded each a group on two tracks within two clock intervals, characterized in that, in order to improve the recording accuracy, the first two bits of each group are recorded in the first clock interval by simultaneously changing the magnetization on both tracks of the magnetic carrier in accordance with the unit signals and the absence of a change in magnetization in according to the signals of the zeros, the third bit of the group is recorded in the second clock interval by simultaneously changing the magnetization on both tracks of the .1 magnetic carrier in accordance with ignoring zero and changing the magnetization on that magnetic track carrier in which the lia magnetization did not change in the first clock interval, or on any Via tracks while simultaneously changing the magnetization on both tracks of the magnetic carrier in the first clock interval in accordance with the unit signal, while preliminarily analyzing the value of three binary code group signals , n according to the result of the analysis, a successive group of signals of the form zero-zero-one is selected with the inversion, the last is; The discharge of which is recorded by the absence of a change: the magnetization of the magnetization on both tracks of the maggp carrier. but