SU1310894A1 - Device for magnetic recording and reproducing of digital informaion - Google Patents

Abstract

The invention relates to magnetic recording and permits a reduction in recording-reproducing errors by reducing the effect of intersymbol interference. The device contains a counting trigger 1, recording amplifier 3, recording-playback head 4, amplifier 5, double-sided limiter 6, pulse shapers 7 and 9, NOT element 8, one-shot 11, delay elements 12-15, elements AND 16-18, element OR 19 and the counting trigger 20. The introduction of new elements and the formation of new connections between the elements of the device allows us to achieve that at the output of the element And 17 we get the code of the original digital information, shifted by one clock cycle. From the output of the element 17, information arrives at the pulse shaper 9, from the output of which, on the output bus 10, the signals arrive at the control device of the magnetic disk drive. 1 il. (L with about 00 with

Description

The invention relates to magnetic recording, and specifically to devices for magnetic recording and reproducing digital information.

The aim of the invention is to reduce reproduction recording error by reducing the effect of intersymbol interference.

The drawing shows a functional diagram of the proposed device.

The device for magnetic recording and playback of digital information contains a counting trigger 1 connected by an input to input bus 2 and an output to the inputs of a recording amplifier 3 connected through a recording-reproduction head 4 to inputs of a differentiating amplifier 5 connected by an output through serially connected double limiter 6 and a pulse shaper 7 with an input of an HE element 8 connected by an output to the input of a pulse width generator 9 connected by an output with an output bus 10.

In addition, the device for magnetic recording and playback of digital information contains a one-shot 11, first, second, third and fourth delay elements 12-15, first, second and third elements AND 16-18, element OR 19, and an additional counting trigger 20 connected between the output of the counting trigger 1 and the inputs of the recording amplifier 3, the first delaying element 12, the first AND 16 element, the OR 19 element, the second delaying element 13 and the second AND 17 element connected in series between the output of the HE element 8 and the input of the former 9 for a long time these pulses, and the third element AND 18 is connected by an output to one of the inputs of the element OR 19, the first input directly, and the second input through the third delay element 14 to the output of the pulse former 7 and the third input connected to interconnected input of the fourth delay element 15 connected output with a corresponding input of the second element And 17, output of one oscillator 11 and one of the inputs of the first element And 16 connected by another input with the output of the element HE 8.

Digital information, in which "1 is represented by two pulses of positive polarity, and" O - by one pulse of positive polarity on the same time interval, arrives at the counting trigger 1, which is converted by them into voltage drops, which, as an input to the additional counting trigger 20 is converted into voltage drops of greater duration. This makes it possible to reduce the number of magnetization reversal of the carrier when recording information and, when reproducing asymmetric codes, to increase the reliability of reading the information. From the outputs of the trigger 20 information enters. Two arms amplifier 3 entries. Amplifier 3 Records

converts the voltage pulses into current pulses in the semi-windings of the magnetic recording head 4. While playing back the information signals read by the magnetic head 4,

go in antiphase to the two inputs of the differential amplifier 5, which amplifies these signals, differentiates them and outputs them to a two-way limiter 6, from the output of which the signal is sent to the pulse shaper 7, which converts alternating pulses close to a sinusoid into negative square pulses polarity. From the output of the imager 7 pulses, the signal is fed to the input element And 11 and through the delay line

(1600 not) arrives at the second input of the AND 18 element, moreover, the signals from the output of the pulse shaper 7 are inverted by the element 8 and fed to the input of the AND 16 element. At its output, the pulse signals correspond to the periods of the following information units and arrive through the delay element 13 at the input of the element 17,

the second input of which receives signals from the one-shot 11 through the element 15 of the delay.

At the output of the element And 17 we get the code of the original digital information, shifted by one cycle. From the output of the element And 17, the information is fed to the shaper 9 of the pulse duration, from the output of which, on the output bus 10, the signals are sent to the magnetic disk drive control device.

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Claims (1)

Invention Formula A device for magnetic recording and reproduction of digital information, containing a counting trigger, connected 5 input to the input bus and output to the inputs of a recording amplifier connected via a recording-reproduction head to the inputs of a differentiating amplifier connected by an output through serially connected double-sided limiter and pulse generator with an input of an element NOT connected by an output to the input of a pulse width former connected to the output output bus, characterized in that, in order to reduce recording-reproduction errors by reducing the effect of intersymbol interference, single brator, first, second, third and fourth delay elements, first, second and third members five And, the OR element and the additional counting element OR, the first input is directly a trigger, connected between the output countingly, and the second input through the third trigger and the inputs of the recording amplifier, the delay element to the output of the driver, and successively connected per-pulses, and a third input connected the first delay element, the first element, And, 5 to the interconnected input is a quadruple element OR, the second delay element, the total delay element, connected to the second element And connected between the output and the corresponding input torogo element house and NOT input of AND gate, and one-output monostable pulse duration, and the third element INIM of the inputs of the first AND gate, the output soedinen- connected to one of vhodovnogo other input to an output of NOT.