SU698043A1 - Method of magnetic recording of information onto magnetic carrier - Google Patents

Description

(54) METHOD OF MAGNETIC. RECORDING OF DIGITAL INFORMATION ON A MAGNETIC MEDIA

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The invention relates to instrumentation, in particular to methods of magnetic recording of digital information on magnetic media, and can be used in the technique of digital magnetic recording to record and simultaneously control reproduction of digital information on magnetic media.

Known methods of magnetic recording of digital information on magnetic media, including control playback of the result of recording 1 and L2.

When using the first method based on the use of two magnetic heads, one of which is used for recording and the other for control reproduction, the space on the magnetic media between the information zones should be increased by the distance between the working gaps of the recording and reproducing heads, which reduces magnetic carrier efficiency. The disadvantage of the second method, based on the use of a universal magnetic head (UMG), is the large time delay of the control, which reduces the recording speed due to rewinding

magnetic carrier to the beginning of the recorded area and the subsequent control reproduction of information.

The closest to the proposed technical entity is a method of magnetic recording of digital information on magnetic media, including a control reproduction of the recording result, which is produced by monitoring the response of the universal magnetic head to the magnetization transition just recorded on the magnetic carrier {3.

However, with this method, the test reproduction of the recording result is produced by the test reproduction of the trailing edge of the magnetic impulse trace, i.e. after turning off the magnetizing field UMG. Therefore, a positive effect can be obtained only when using the method of returning to zero (EIA) and cannot be obtained using the recording method without returning to zero (EIA), which limits the scope of application of the method.

The purpose of the invention is to expand the scope of application of the method.

This goal is achieved by the fact that the recording of the result of the recording after the creation of the magnetizing magnetic field {the magnetic field head or the change of its direction after the creation of the magnetizing field results.

FIG. 1 shows temporal daagrams related to the methods of recording EAS and BVI; FIG. 2 illustrates the recording process.

The recording of digital information on magnetic media is carried out in a perceptible manner.

The magnetic carrier is moved relative to the universal {1st govnn (UMG), the change in current (flow) through which the corresponding element of the information element is chosen so fast that the effect of the movement process on the transition of the magnetization on the magnetic medium can be avoided. When using the SVH recording method, the magnetic carrier is pre-nambered before writing the information element to saturation in one direction, there is no current in the UMG. When you write down an information element, a short current pulse is passed through the UMG, the magnitude of which is sufficient to cause the magnetic carrier to magnetize before saturating in another direction. When using the BVN recording method, a constant current is passed through the UMG, the magnetic carrier is kept in one direction and the direction of the current is changed and the magnetic carrier is saturated in another direction when the information element is to be written.

Each time the current (flow) 1 is switched on or the current (flow) 2 is changed (moments T 1 or T 3 in the diagram), per mag) Media carrier to the right of the center line 3 of the working gap 4 of the UMG 5, a transition b is formed, and on the winding 7 of the UMG, a signal 8 appears (8 self-induced emfs. When the MarmiTHoro carrier is removed from the UMG in the direction indicated by the arrow, all the sections to the left of the center line 3 of the working gap 4 are magnetized to saturation, and on the winding 7 of the UMG a signal 9 is induced (9) caused by removal from UMG 5 just magnetization transition 6. Signal amplitude 9 (9) is 3–4 times less than signal amplitude 8 (8) (in the time diagram, they are shown for clarity in different masses). It can be carried out, for example, using a well-known mouth, in which the gating pulses T 2 and T 4 are selected accordingly.

At the end of the control reproduction of the recording result when using the EIT mode, the write current is turned off. In this case, a head transition (not shown in the drawing) is formed from the center line of the operating gap of the UMG. When moving, the signal 11, which is not used in the proposed method, but is used in the known method, is displaced from the working clearance of the UMG. Play around and record and control playback of the result of recording one element of information, record and control playback of the result of recording another element of information, and.

When using the EIT recording method, the magnetic media can be demagnetized before recording the information item, and the maximum levels of the recorded signals in both recording variants (ETS and EITs) may not bring the magnetic media to saturation in one direction or another. In this case, the difference in magnetization on a magnetic carrier is reduced, but the essence of this method of magnetic recording is not.

The use of the proposed method will allow to increase the recording speed by 3 times N only when using the method of recording CBH, as in the prototype, but also when using the method of writing BVN, which will expand the area of application of the method.

Claims (3)

1. Magnetic recording. Sat articles ed. j8. G. Korolkova, M., Mir, 1966. with. 183. 2. Advanced scientific-technical and industrial experience, M., GOSINTI, 1963, N 30-63-98 / 3, p. 51. 3. USSR author's certificate number 615529, class, GPPV 5/02, 1977 (prototype). T2 BUT.