SU842941A1 - Device for reproducing digital information from magnetic record carrier - Google Patents

Description

(54) DEVICE FOR REPRODUCTION OF DIGITAL INFORMATION FROM MEDIA MAGNETIC RECORDING

The invention relates to magnetic recording, namely, to devices for reproducing digital information from magnetic recording media. A device for reproducing digital information from a carrier of magnetic recording is known, which contains a reproducing head connected to an amplifier, the output of which is connected to the output information bus via a transducer of a reproduced signal P1. A lime device has a relatively simple design, but does not allow for reproducing digital information recorded with a sufficiently high density. Also known is a device for reproducing digital information from a magnetic recording medium containing a reproduction head of a reference signal connected through an amplifier shaper of a reference signal. - with the input of the frequency multiplier, and the information playback corals, each of which consists of the playback heads connected in series of information and the amplifier of the Information Formation, from the first OR element connected in series, the first counter and the first AND element, from the second counter in series, the second AND element, the third AND element, the fourth AND element, the second OR element, Kipprell and information output bus and from delay lines and trigger. This device allows the reproduction of digital information recorded with a sufficiently high density Tzl. The disadvantage of such a device is the considerable error in reproducing digital information from a magnetic recording medium. The purpose of the invention is to reduce the error in reproducing digital information from a magnetic recording medium.

This goal is achieved due to the fact that in each information playback channel, the output of the information shaping amplifier is connected to the fourth AND element, to the third AND element connected to the input of the second OR element, to the delay element whose output is connected to the second counter, to the trigger, The code of which is connected to the first AND element, and the counting input to the first counter, and to the first OR element. At the same time, in each channel of information playback, the first counter is connected to the output of the frequency multiplier, and the output of the first element I is connected to the trigger to the second counter, to the first element OR, and to the third element I.

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

The proposed device comprises a reference signal reproduction head 1, connected via an amplifier — a 25 shaper 2 reference signal with an input of a frequency multiplier 3, and channels 4 for reproducing information. Each information reproduction channel 4 consists of sequentially connected information reproduction head 5 and information amplifier 6, of the first element OR 7 connected in series, the first counter B and the first element. 35 And 9, of the second counter 10 connected in series, the second element 11 and the third element 12 and the fourth element 13 and the second element OR 14, the kip-relay 15 and the output 40 bus 16 and from the delay line 17 and the trigger 18 In this case, only one channel 4 of information reproduction is shown in the drawing, although their numbers are. Lo can be any .45

In the device in each information playback channel 4, the output of the information amplifier 6 is connected to the fourth element AND 13, 50 to the third element AND 12 connected to the input of the second element OR 14 to the delay element 17, the output of which is connected to the second counter 10, to trigger 18, the output of which 55 is connected to the first element AND 9-, and the counting input to the first counter 8, and to the first element OR 7. At the same time, in each information channel 4, the first counter 8 is connected to the output of the multiplier 3 frequencies, and first element And 9k trigger 18, to the second counter 10, to the first element OR 7 and to the third element AND I2.

The device works as follows.

The information pulses from the output of the information amplifier 6 are set to the zero state by the first counter 8 and the second counter 10, respectively, through the first element OR 7 and the delay line 17, and in one state, a trigger 18, which opens the first element 9. And The first counter 8 receives a signal from the output of the multiplier 3 frequencies. After filling the first counter 8, the first element AND 9 generates a pulse, which sets the zero state of the trigger 18. This pulse also sets the first counter 8 to the zero state, which, after refilling, sets the trigger 18, opening the first element And 9 for highlighting the next pulse.

The use of the proposed device allows to significantly reduce the error in reproducing digital information from a magnetic recording medium.

Claims (2)

Invention Formula A device for reproducing digital information from a magnetic recording medium, comprising a reference reproduction head connected through a reference driver amplifier to a frequency multiplier input, and information reproduction channels, each of which consists of an information reproduction head connected in series and an information amplifier amplifier, the first OR element connected in series, the first counter and the first AND element, from the second counter connected in series, the second And, the third And, the fourth And, the second OR, the kip-relay and information output bus from the delay line and the trigger, characterized in that, in order to reduce reproduction error, the output of the amplifier is the information driver is connected to the fourth AND element, to the third AND element connected to the input of the second OR element, to the delay element whose output is connected to the second counter, to the trigger whose output is connected to the first AND element, and the counting move - a first counter and the first OR element, wherein each channel information reproducing subfamily union of the first counter to the output of the frequency multiplier. 16 and the output of the first element I - to the trigger, to the second counter, to the first element OR, and to the third element I. Sources of information taken into account in the examination 1.Hogland A.S. Digital magnetic recording. Soviet radio M., 1967, p. 161-175. 2. US patent number 3979771, cl. 360-51, 1976 (prototype).