SU1224822A1 - Device for reproducing digital information from magnetic record medium - Google Patents

Abstract

This invention relates to the field of magnetic recording. The purpose of the invention is to increase the reliability of reproduction of digital information from a magnetic recording medium. The analog signal is fed from the playback amplifier 1 to the differentiating element 2, to which Gorye acts on the comparator 3, which forms rectangular pulses applied to the differentiating element 4, the latter generates short pulses of different polarities applied to the comparators OR 8 to the one-shot 14 and 15. The pulses from the one-shot 14 go to the shift register 7, and from the one-shot 15 to the splitter counter 6, which is also affected by the generator of 5 pulses. The selection of the required bit of the splitter counter 6 is made by the element 2I-OR-NOT 13 according to the control signals supplied from the buses 17 of the control signals. Element 2И-Ш1И-НЕ 13 acts on the one-shot 16 and on the shift register 7, which generates information pulses fed to the bus 9. 1 Il. about s (l

Description

The invention relates to magnetic recording, in particular, to devices for reproducing digital information from a magnetic recording medium.

The aim of the invention is to increase the reliability of reproduction of digital information from a magnetic recording medium.

The drawing shows one of the possible variants of the proposed device for reproducing digital information from a magnetic recording medium.

The device contains a playback amplifier 1 connected in series, the first differentiating element 2, the comparator 3 and the second differentiating element 4, the pulse generator 5, the output of which is connected to the control input of the divider counter 6, the shift register 7, the OR element 8, the information an output bus 9 and a synchronization output bus 10, wherein the input of the playback amplifier 1 is connected to a reproducing magnetic head coupled to the magnetic recording medium.

The device also contains the first 11 and second 12 additional comparators connected by inputs to the output of the second differentiating element 4 and connected by outputs to the inputs of the element OR 8, element 2И-ШШ-НЕ 13, connected to the outputs of divider counter 6 ,, and the first 14 , the second 15 and third 16 one-shot. The first one-shot 14 included

between the output of the element OR 8 and the information input of the shift register 7 connected by the output to the information output bus 9, the second one-shot 15 is connected to the control input of the shift register to the control input of the logical divider 0 counter 6. 7 and to the synchronizing output slit 10. The output of the element OR 8 is connected to the input of the second one-oscillator 15. The output of the element 2I-OR-NOT 13 is connected to the input of the third one-oscillator 16. At the same time, the first one-oscillator 14, the second differentiating th element 4 and an element-2I Hilti NOR 13 are formed, with input buses 1 July steering of signals coupled to their inputs.

Reproduction of digital information from magnetic recording media

five

0

5 0 5

g

 0 5 5

five

through the proposed device is as follows.

Claims (1)

The analog signal reproduced from the magnetic recording medium of the reproducing magnetic head comes from the reproduction amplifier 1 to the first differentiating element 2, the time constant of which depends on the speed of movement of the magnetic recording medium. The first differentiating element 2 acts on a comparator 3, which forms rectangular pulses supplied by the second differentiating element 4. The second differentiating element 4 forms short pulses of different polarities fed to the first 11 and second 12 additional comparators acting through the element OR 8 on the first 14 and 15 second single-vibrators. The first one-shot 14 produces broad pulses close to the meander, and the second one-shot 15 - narrow pulses. The pulses from the first one-shot 14 are fed to the shift register 7, and the pulses from the second one-shot 15 to the splitter counter 6, which is also affected by the generator 5 of pulses. The selection of the required bit of the divider counter 6 is made by the element 2I-OR NOT 13 according to the control signals supplied from the input fields 17 of the control signals. Element 2I-1 1I HE 13 acts on the third one-shot 16, which forms positive synchronization pulses on the rear edges, which are sent to the synchronization output bus 10 and to the shift register 7, which generates 1Y information pulses applied to the information output bus 9. Formula of the invention A device for reproducing digital information from a magnetic recording medium containing a reproduction amplifier connected in series, a first differentiating element, a comparator and a second differentiating element, a pulse generator whose output is connected to the control input of a divider counter, a shift register, an OR element, an information output bus, and synchronizing output psn ;, characterized in that, in order to increase the reliability of reproduction of digital information, the first and second additional comparators are connected to it, connected by inputs to the output of the second differentiating element and connected by outputs to the inputs of the OR element, element 2И-OR-NOT, connected to the outputs of the divider counter, and the first one-shot, connected between the output of the element OR and the information input the shift register connected by the output to the information output bus, the second one-shot, connected to the input of the set224822 ki logical About the divider counter, and the third one-shot connected by the output to the control input of the shift register and to the clock output bus, the output of the OR element is connected to the input of the second one-shot, the output of the element 2I-OR-NO is connected to the input of the third one-shot, and the first 10, the one-shot, the second differentiating element, and the element 2I-OR-NO are made with the input buses of the control signals connected to their inputs.