SU801048A1 - Magnetic recording method - Google Patents

Description

one

The invention relates to instrument engineering, and more specifically to a technique of magnetic recording and reproduction.

Magnetic recording methods are known when a separate track is used to record the clock signals. Marker and information codes (code groups) are recorded on a different track. Such a sync signal recording is used for parallel writing of code bits, when sequentially writing code bits, either a separate roadmap is used or the sync signal is aligned with the sync code l.

The disadvantage is the complexity of the equipment, providing noise immunity and non-optimal use of the carrier, which reduces the amount of recorded information.

The closest in technical essence to the proposed is. Recording method based on recording one-track media magnetic recording clock signals, marker and information signals 2.

The disadvantage of this method is rather low noise immunity, as well as non-optimal use of the capabilities of the magnetic tape in terms of recording density, complexity of equipment and recording and playback algorithms.

The purpose of the invention is to increase the noise immunity, simplify the recording and playback equipment and increase the recording density.

This goal is achieved by the fact that the sync signals modulate marker information signals, one group of marker signals being recorded at least one group of information signals, each subsequent signal group is separated from the previous unmodulated clock signal, and the number of signals recorded in each group of information signals , one less than the number of signals in the corresponding group of marker signals.

The drawing shows a variant of building a frame of a sequential stroke using amplitude modulation.

A frame (code nozzle) consists of m marker signals of the beginning determinant, g of the total number of information signals (depending on 0 on the number of groups) and separating sync signals. Such a frame structure, which has the largest number of random (information signals) places along the entire frame length, is considered optimal. In accordance with the frame building rule, the quantitative ratios are not in the frame (code word) as follows: N m + l + r + where N is the total number of clock pulses (sync signals) in the frame. The optimality condition is defined by the dependence Un-1 Quantity the information signal in the frame is N - m - 1 I. g (m - 1). Having certain values of N, g and t, determine the smallest value (n, providing the maximum recording volume, i.e. maximum value g. A positive effect is achieved. Due to the simplicity of the algorithm for recording and reproducing a code word, the ability to control the reliability of a frame by the number of separators pulses, the location of information groups and the appearance of interference at the site of the separation pulse, and the sure and easy synchronization of the means of recording and reproducing code words. Forces / Hum of the Invention Magnetic recording method based on recording a magnetic signal recording carrier, marker and information signals on a single track, characterized in that, in order to increase the noise immunity and increase the amount of recorded information, the sync signals are modulated by marker signals. and information signals, and at least one group of information signals is recorded on one group of marker signals, each subsequent group of signals is separated from the preceding boiling nemodulirov .annym clock signal when the number of signals recorded in each group of information signals, one less than the number of signals in the corresponding group sig.nalov marker. Sources of information taken into account in the examination 1. V.Aksenov. et al. Precise magnetic recording. M., Energie, 1973, p. 5-18, 212-267. 2. Manovtsev A.P. Fundamentals of the theory of radio telemetry. M., Energie, 1973, p. 511-515 (prototype).

Claims (1)

Claim A magnetic recording method based on recording on one track of a magnetic recording medium of clock signals, marker and information signals, characterized in that, in order to increase the noise immunity and increase the amount of recorded information, the clock signals are modulated with marker and information signals, and not one marker group of signals is recorded less than one group of information signals, each subsequent group of signals is separated from the previous unmodulated clock signal, while the number of signals recorded the information signals generated in each group are “one less than the number of signals in the corresponding group of marker signals.