SU455363A1 - The method of magnetic recording and playback of digital information - Google Patents

Description

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The invention relates to the field of instrumentation, in particular, to methods for recording and reproducing signals of digital ira information on magnetic media.

Methods are known for recording and reproducing digital information signals using magnetic media. When implementing such methods, the recording is carried out in the form of a sequence of signals of the selected code, for example, binary. In doing so, different fixed time intervals are used to represent the symbols in the form of "O and" 1. In this case, due to the use of irregular periods between the characters, the consumption of the magnetic carrier is unnecessarily large. In addition, it is difficult to increase the average speed of movement of the carrier.

The purpose of the invention is to increase the efficiency of using the area of the magnetic carrier and increase the average speed of recording information.

This is achieved by the fact that in the process of memorizing each group of symbols, the proposed method determines the number of each type, selects the interval between polls and records additional symbols that characterize the time interval for each type of information symbol, and during playback determine the type of symbol and set The original sequence of characters information in the previously recorded group.

Additional characters are written at the beginning or at the end of the group at intervals equal to the information symbol time intervals.

The drawing shows diagrams of recorded and reproducible signals as applied to binary code, where a and g are groups of symbols of the recorded information; b. 3 - polling signals; in, and - signals of an additional symbol; r, k - signals of symbols d, l - signals of symbols e, m - the state of magnetization of the recording medium.

Accepting that for recording the character “1, the interval TI is required, for“ O is the interval Go n. For the additional symbol — the interval TZ, we define (a, b, d, (E) that T, T2, T. In this case , if the number "O in group a does not exceed a certain value, for example A, the recording is made at the indicated intervals, and the additional symbol is not recorded (c., e. The value of A is determined by the outcome of the total number of characters, for example , in the group, which we call K, and from the values of the received time intervals for writing characters, then

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