SU860119A1 - Method of reproducing digital data from magnetic recording medium - Google Patents

Description

The invention relates to magnetic recording, in particular, to methods of reproducing digital information from a magnetic recording medium. There is a known method of reproducing digital information from a nozzle carrier by limiting the reproduced signal of digital information. The known method allows to ensure the relative simplicity of the process of reproducing digital CQ information. The disadvantage of this method is that it does not provide reproduction of digital information recorded on magnetic media with a sufficiently high density. The method of reproducing digital information from a magnet oxide carrier is known by extracting from the result of a two-sided constraint on the minimum of the reproduced signal and generating digital information pulses by comparing the alternation of positive and negative values of the derivative with a given alternation. This method provides reproduction of digital information recorded on magnetic recording media with a relatively high density L21. The disadvantage of this method is small pzheshoustoychivosti when playing digital information with a carrier, l magnetic recording. The purpose of the invention is to increase the noise immunity of reproducing digital information from a recording medium. This goal is achieved due to the fact that comparing the alternation of positive and negative values of the derivative is carried out in time intervals exceeding the reproduced signal of the thresholds of two-sided limitation on the minimum with durations of negative negative values.

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SRI derivative is greater than a given time interval.

The method is carried out as follows.

After amplification, a two-sided limitation is imposed on the minimum of the reproduced signal, consisting of an IF signal of digital information and noise. From the result of the two-sided limitation on the Minimum of the reproduced signal, differentiate is obtained by differentiation. The duration of the HibiX positive is then determined; and negative values of the derivative and the order in which they are followed. After this, digital information pulses form. Comparison of alternation

positive and negative values of the derivative with a given alternation. Comparison of the alternation of positive and negative values of the derivative is carried out in the time interval of the derivative. The signal of the thresholds of the two-sided limit is 1–1 and the minimum at the duration of the pollock and negative significant derivatives greater than the specified time interval. This leads to the fact that the noise present in the reproduced signal does not affect the shaping of the pulses of digital information.

The use of the inventive method offered above makes it possible to significantly increase the room resistance.

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playback of digital information from a magnetic recording medium.

Claims (1)

 Invention Formula A method of reproducing digital information from a magnetic recording medium by extracting a derivative from the result of a two-sided limitation on the minimum of the reproduced signal and generating pulses of digital information by comparing the alternation of positive and negative values of the derivative with a set of interlaces. about tl and h and y i and with THAT ;, the goal is to increase the noise immunity of reproduction, comparing alternations of positive and negative values of the derivative make fe the time intervals by which the reproduced signal of the thresholds of the two-sided limitation on the minimum at the duration of the time period is used and the negative values of the derivative greater than the specified time interval ... Source information taken into account during the examination , 1. Ioffe A.F. Application of magnetic recording. M.-L., State Power Energy Publishing House, 1959, p.P.-17 .; 2, Hoagland A.S. Digital magnetic recording. M., Soviet radio,. 1967, p. 169-171 (prototype).