SU1140153A2 - Process for magnetic recording and reproducing of digital telemetry - Google Patents

Abstract

METHOD OF MAGNETIC RECORDING AND REPRODUCTION OF TELEMETRIC DIGITAL INFORMATION on the author. St. No. 402909, characterized in that, in order to increase the efficiency of use of a magnetic carrier, in each group of information binary symbols ne1000 O O O f - v, lw ,, ,,. They, li jl ftilynni and Ml ИI I i II1 C, by their successive polling compare the number of logical ones and zeros and for a binary symbol, larger in the group, remagnetize with the smaller of the two character intervals of the record, and when equal logical units and zeros in a group with a smaller symbol interval magnetize the carrier while recording a logical unit, and before recording the first binary symbol of each group, the carrier is additionally magnetized with an interval equal to the symbolic recording interval unit in this group of information binary symbols. Recounted 00 0011 o 11 00 01 f o ill t I i li p pi F4ftJUn rLriJl

Description

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The invention relates to the field of instrumentation, in particular to methods for recording and reproducing symbols of digital information on a moving magnetic recording medium.

According to the main author. St. No. 402909 discloses a method of magnetic recording and reproducing telemetric digital information by storing a group of information symbols, sequentially polling them at time intervals, the length of which changes according to the value of the previous simplified information symbol and changing the direction of magnetization of the recording medium at the moments of polling the buffer device. As a result, the magnitudes of the intervals between the magnetization reversal of the recording medium uniquely identify the binary symbol (e.g., "1 or" O). This method allows you to simply and reliably record and play digital information 1

However, the disadvantage of the method is the inefficient use of magnetic media in cases where the amount of a binary symbol recorded with a large symbol interval prevails over another symbol in the information sequence.

The purpose of the invention is to increase the efficiency of using a magnetic recording medium.

The goal is achieved by the fact that according to the method of recording and reproducing telemetric digital information, in each group of information binary symbols they compare the number of logical units and zeros before their sequential polling, and for a binary symbol larger in the number in the group, the carrier with the smaller of two symbol intervals is reclosed. , and with the equality of logical units and zeros in a group with a smaller symbol interval, the carrier is re-magnetized when writing a logical unit, and before recording, The second binary symbol of each group additionally re-magnetizes the carrier with an interval equal to the symbolic interval of the logical unit in this group of information binary symbols.

FIG. 1 shows a chart of recording and reproducing data using the proposed method (for simplicity, the number of characters of information is chosen equal to 8); in fig. 2 is a simplified block diagram of one embodiment of a device implementing the proposed method.

Recording and reproduction of information according to the proposed method is as follows.

The group of information symbols that are subject to magnetic recording is memorized in

buffer storage, for example, 8 binary symbols (Fig. 1a). In each group, the number of "1 and" O. For the predominantly binary symbol, the carrier is re-magnetized with the smaller of two established symbol intervals in this group. In case of equality of logical ones and zeros in the group (for an even number of characters in the group), the remagnetization is changed with a smaller symbol interval

recording media “1. To recognize the record "1 from zero (" encoding key) ", the carrier is additionally remagnetized before recording the first character in the group with an interval equal to the character ing and recording interval" 1 in this group of information binary symbols.

When playing from a signal (Fig. 1e) read from a recording medium, a sequence of signals is formed (Fig. 1g), the distances between which correspond

0 intervals between changes in magnetization (Fig. 1e) of the recording medium. The distances between the signals in the sequence (Fig. 1g) are measured and form two sequences of pulses, one of which (Fig. 1h) corresponds to shorter intervals (Tj) between the remagnetization of the recording medium, and the other (Fig. Lu) to longer (Tg) . The first signals (fig. 3, i) are selected as additional (fig. 1 / s) and are excluded from the sequence of information

0 signals (for example, by counting the reproduced signals). Depending on which interval (Tj or T,) the additional signal corresponds to, a control command (FIG. 1L) is formed, according to which of the signals (FIG. 1,

5, and) form the information symbol signals of the corresponding sign “1 (FIG. IJH) or“ O (FIG. 1H), the sequence of which (FIG. In) corresponds to the initial data (FIG. La).

The device (Fig. 2) contains a mechanism for transporting the recording medium 1, connected via a playback signal conditioner 2, an interval measurement unit 3, connected by outputs to the corresponding inputs of an additional signal extraction unit 4, an additional signal conditioner in group 5 and a data character imager 6 , the other two outputs of which are connected one to the output of the generator of the additional signal of the characters in group 5, the other simultaneously to the input of the latter, to the output of block 4 and the bus 7 additional the output signal, and the outputs to the data lines 8, the recording amplifier 9, connected with the output to the transport mechanism of the recording medium 1, the first input through the control unit 10 to the second input of the transport mechanism of the recording medium 1 and the command width 11, the second input through the data interrogator 12 with the input of the memory section of group 13 of the memory block 14, through the shaper of intervals 15 with the output of the memory section of group 13, through the serial connection of the signal generator of the interrogation of the additional signal 16 and the character analyzer 17 of the out section home memory group 13 and the generator 16 through a shaper interrogation signal inputs 12 and data storage unit 14, as well as output control unit 10.

When data is written to magnetic media, the corresponding command goes to control unit 10 via bus 11, the transport mechanism of recording medium 1 is turned on, and then control unit 10 generates signals at its outputs that turn on recording amplifier 9 to record mode of the first magnetization reversal of the recording medium and simultaneously driver 16 at. the mode of forming the signal (Fig. 1c) of the additional interval. In accordance with this signal, in the memory block 14, a group of symbols is formed in section 13: The symbol analyzer 17 determines a symbol (1 or 0), the number of which is greater in a given group, and at its output forms the corresponding command (Fig. 16), which enters the shaper 15 input. In accordance with this command, from the output of the shaper 15, the next signal is input to the input of recording amplifier 9, through which the Recording medium is re-magnetized on the additional interval selected for this group (Tj, Fig. 1e). At the same time, the signal from the output of the imaging unit of intervals 15 is fed to the inputs of the imaging devices 12 and 16. After the first interrogation signal has been generated, the corresponding imaging device 16 opens a data polling data generator 12 from the second output and the output signal from the imaging generator 15 enters the memory section 13 , from the output of which the signal of the first data symbol is fed to the input of the interval generator 15. Depending on the symbol sign and the command (Fig. 16), the inputs of the interval imager 15, you During the course, the next signal is formed at a time interval T or Tg and the recording medium is re-magnetized (T, Fig. 1 (3)).

character group recordings, the driver 16 closes the data interrogator signal generator 12 for passing the signal from the output of the interval generator 15 and generates memory block control signals

14 and an analyzer 17, as a result of which a reversal of the recording medium occurs on the interval corresponding to this group of symbols (T, Fig. E) of the additional symbol. Further, these

for the first character group of processes.

When played back by the appropriate command via bus 11, the mechanism for transporting the recording medium 1 and the device nodes corresponding to this mode are activated. The signal of the recording medium (Fig. 1e) is converted by shaper 2 into a single-channel pulse train (Fig. 1g), the distances between which correspond to the intervals between the magnetization reversal regions (Fig. 1e) of the recording medium). This sequence enters the input of the measurement unit of intervals 3, the outputs of which form signals corresponding to the smaller (T) interval (Fig. 1h) and the longer (T) interval (Fig. 1a), and enter the inputs of the allocation unit 4, the former 5 and of the signal generator of the data symbols 6. Block 4 from the sequence of signals (Fig. 1h, and) generates a signal corresponding to the additional interval (Fig. 1 / s), which with

0 its output enters the length 7 at the input of the data signal generator 6, closing the last one for passing signals (Fig. 1h, 3) to the data bus 8, and also entering the generator 5, which, depending on the presence of a signal on others

5 its inputs (FIG. 1H, I) form at its output a control command (FIG. 1L), in accordance with which the imaging unit 6 forms from subsequent signals (FIG. 1H, and) signals of data symbols of the corresponding sign ("1 or" O , Fig. 1m, k). As a result, a code sequence is formed at the outputs 8 of the device (FIG. In) corresponding to the source (FIG. 1 a).

The technical and economic advantage of the proposed method in comparison with the known method is to increase the efficiency of using the surface of the recording medium.

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Claims (1)

METHOD FOR MAGNETIC RECORDING AND PLAYBACK OF TELEMETRIC DIGITAL INFORMATION by ed. St. No. 402909, characterized in that, in order to increase the efficiency of using a magnetic medium, in each group of information binary symbols 1000 О О О 1 011 О 11 00 By sequential polling, the number of logical units and zeros is compared, and for a binary symbol with a larger number in a group, they are magnetically remagnetized with the smaller of two symbolic recording intervals, and if logical units and zeros are equal in a group with the carrier is magnetized with a smaller symbol interval when writing a logical unit, and before recording the first binary symbol of each group, the carrier is additionally magnetized with an interval equal to the symbol interval of the logical unit recording in this group of information binary characters. 01 t LL J 1 / ¾-Y <- I I TsShiPPDDiDGTL