RU1780095C - Method for magnetic recording and playback of digital information - Google Patents

Abstract

The invention relates to the accumulation of information and can be used to record-reproduce digital information on a magnetic medium. The goal is to increase the reliability of the reproduction of digital information. SUMMARY OF THE INVENTION: The initial information is' pre-encoded into binary code for one combination of units, which are bit-separated, and a pulse-width signal of constant duration is generated. Magnetic recording of each of the pulse-width signals is carried out starting from the initial level of magnetization, simultaneously with a change in magnetization. The direction of the change in magnetization is determined by the significance of the bit. The sequence of information pulses is separated by the marker SIGN.9LOM, the marker signal is recorded before the information cycle is recorded by changing the magnetization of the medium of the magnetic recording from the level of magnetization obtained by placing the last bit ,? the previous cycle of information, to the initial level of magnetization! - ;. When reproducing the result of magnetic recording, the marker signal and digital information are extracted from the reproduced valuable signal by the amplitude-polar signal, by analyzing the polar sign of each pulse transmission. As a control, separate counting of pulses of each polarity is carried out and an alternating interval between adjacent and! - / 1-pulse signals is analyzed. 2 il.li, .- ..

Description

The invention relates to the accumulation of information, and in particular to methods for recording A of reproducing digital information.

A known method of recording and reproducing digital information is that the original digital information is encoded into an even number of consecutive bytes of information, each odd byte 8 is converted into a pulse-width signal, and each pulse-width signal is recorded simultaneously with a change in the n-value. the magnitude of the change in magnetization, the magnitude of the change in the magnetization of the recording medium is determined by the value of the even byte value. Marker recording 1a is recorded by changing the neivi and the nose and body in that direction. When playing a specified. . : from the marker signal and carry out the demodulation of digital information with allowance for the amplitudes of the reproduced signals for the | - | formations and the time: the first intervals between adjacent reproduced pulses. The closest to the invention in technical essence is the method of RECORD1: vi-reproduction of digital digital feed, which consists in the fact that the original log (L0 piVi and the CPU is red-wired and re-encoded is DVut: 1; - 1 one combination, SaTeiv: the binary code signals for the CiiHo combination are divided into information01 -; 88 groups, each of which has a pre-squeeze, -: Л: l corresponds to the distribution of 1, -. Г1Гг, proportionally to the length of the spread “- ;: flax codes form a latitudinal-impulse signal, recording from the magnetic medium of each of unpoino-MfvinynbCHbix c i / iiHa oa carry out automatic telephone exchange at the same time as the last f of them 8 unchanged and unchanged, one direction to reach ;; v; x COOTervice14 about the maximum Vaemon of the magnetization of the magnetic temperature1. information by the maximum change; :; 1mA H1,1 of the magnetic recording medium CW of another -; apraBlenil, When playing i. p93ynLjT3Tei magnetic recording emit -;: .- 5 of the reproduced signal arker on; (. -i4i-oavo information dvodomod -. ::: For the mainstream ::; pediom wide .impulse i-iO;) with respect to mzkergyugo,;, :: m; ---; 7 With the calculation of the number of playback units,; l : / -; 11P / LCO3. n: {: all that is needed for this method is the following: - zav1-1C /) The reliability bridge is possible; 1. .- knowledge of digital information from it; t ;; and and / I n about with 1 d give ic e n and magnetic but;: b1body; -1 near the magnetic head. Except about. m, -: gn1. the record is characterized by a preE) alluring Y; the occurrence of loss of whitefish; n le. S sroM case when using the VG-PVi iHHOi o method MOKf-io only o5n;: fail errors, it is not possible to recover the information -1. CDCH;; on the invention, there is a significant decrease in the instability of the MarHviTHoro media on E OS G | swarms 3 Adene is not digital information, The second objective of the invention is, in / leiil-ie wide possibilities for restoring /; Similar information in certain combinations of information signal loss, and in other cases - oG Jap. ouJib. The goal is achieved very quickly by using latitudinal pulses: modulation as a carrier of digital information. And pto del is mainly achieved by maintaining redundancy by transcoding the source information into binary code signals for one combination. Both goals are combined by a set of attributes, which are presented in the following sequence: initial information is pre-encoded into a binary digit code H8, one combination of m units; binary code for one combination is divided into groups of one bit in each group; forming a pulse width cwr of constant duration for placement of each bit on the magnetic medium; each of the pulse-width-pulse signals is recorded, starting from the initial level of magnetization, simultaneously with a change in the magnetization, and the direction from; - 1 the change in magnetization is marked by the significance of the bit; the sequence of information pulses is separated by a marker signal, the marker signal is recorded before recording the information cycle by changing the magnetization of the carrier of the m-lag recording from the magnetization level obtained by placing the last bit of the previous information cycle to the original magnetization level; when reproducing the result of the magnetic recording, a marker signal is extracted from the reproduced signal by the amplitude-polar sign; digital digest information is determined by analyzing the polar feature of each impulse transmission; 3 as a control, separate counting of pulses of each polarity is carried out; analyze the time interval between adjacent pulse signals. In FIG. 1 shows an apparatus for carrying out a method; in FIG. - an example of converting an initial 11-bit code into a 13-bit code into one combination into 5 units and then dividing into 13 bits, which shows a timing diagram of an electrical signal on the recording head, explaining the essence of the method for this example, are defined time intervals Tk. necessary to accommodate one cycle of information. and time intervals TR necessary to accommodate one bit, and a timing diagram of an electrical signal on a playback head is shown. A device for implementing the method of recording and reproducing digital information contains a buffer register 1, connected to the binary code to code converter 2 by information outputs, the output of which is connected to the input of the shift register 3. The output of the shift register 3 is connected on one side to one input of the reverse counter 5, and on the other hand through an inverter 4, to the other input of the shift register 3, the output of which is connected via a digital-to-analog converter (DAC) 6 to the recording head 7. The start signal is fed to the input of the control and synchronization device 8, which in turn is connected to the crystal oscillator 9 by another input and connected to the control inputs of the buffer register 1, binary code converter 2, shift register 3, and counter counter 5,

In the receiving part, the device comprises a read head 10 connected to the pulse signal amplifier 11, the output of which is connected to the inputs of the discriminator 12, the timer 13 and the amplitude detector 14, the outputs of which are connected to the input of the calculator 15, and the output of the calculator 15 is connected to the input of the converter 16 combination code in normal binary code.

The method using this device is as follows.

The source p-bit binary code is entered into the p-bit buffer register 1. The conversion of the original p-bit binary code into the p-bit binary code for one combination of m units is performed in the code converter 2. The resulting p-bit binary code for one combination is in turn entered into the p-bit shift register 3. All these operations are carried out under the control of the control and synchronization device 8, which activates its work when the start signal arrives and regulates the operation of the remaining units of the device using signals from the crystal oscillator 9. After placing the converted code in the shift register 3, the entered code sequence is shifted As a result, at the output of the shift register 3, pulse signals appear alternately characterizing the significance of each bit of the code sequence . Pulse Signals are sent to the counting inputs of a reversible binary counter 5, previously set to the initial state from the control device and synchronization ;. The appearance of a code sequence 1 increases the state of the counter, and logical O reversed by the inverter 4 decrease the state of the reversible binary counter 5, the binary state of the reverse counter 5 goes to input 5 of the DAC 6, at the output of the DAC 6 a corresponding signal is organized, which through the recording head 7 located on a moving magnetic medium. When reproduced in the read head 10, a

0 EMF, due to the movement of the signal relative to the head. The reproduced waveform is amplified by the level of the pulse amplifier 11. Then the pulse signals arrive

5 parallel to the moves of the discriminator 12 floor. polarity, timer 13 and amplitude detector 14. The binary value of the timer characterizes the time interval between adjacent incoming signals, the discriminator of polarity and the amplitude detector generate two-level signals or 1) characterizing the polarity and magnitude of the amplitude of each incoming signal. In the calculator 15 to

On the basis of the amplitude criterion, the sense of belonging to each pulse transmission is determined (i.e. whether this signal is an auxiliary signal; Л1; informational), the binary content of each signal is determined by the polarity indicator, using the value characterizing the time interval, the reliability is checked upon the occurrence of each impulse transmission. The pos.g binary is the driver of the pulsed signal pos. concluded .me: ktsu with service signals (mzkerammm), is binary; th code for one combination. The code converter 16 converts the sneaker into one combination in

0 source normal. Binary code.

Claims (1)

SUMMARY OF THE INVENTION Method for Magnetic Recording-Reproduction of Numerals General 1-1 - Formations Including a Preliminary 5 transcoding the signals of the initial information into the signals of the binary code into one combination of several units, after which the separation of the sig; -; binary code catch 0 into information:.; E groups with the separation of the received groups by a 1M signal, converting the information group to a pulse-width signal, recording one of the pulse signals simultaneously with a step change, the magnetization of the nose and then reproducing the result of the magnetic recording with highlighting from the reproduced signal of the marker signal and digital information and counting the number of reproductions in kazmnryu; n h ich .; By changing the HaMai-HUMenHocTi-i medium from the level of magnetization obtained in the cut. Record the last bit of the previous cycle to the initial level of magnetization, and during playback); .- The clear signal and digital information are extracted according to the amplitude-polar at:; taking into account the polar sign of each: l pulse sequence. parts-:, by counting the impulses of each polonog-i:.; by the temporary temporary nerve of St. Nicholas’s: every neighbor; /; mm impulse mi ci / irHt / i.9