SU932536A1 - Digital magnetic recording apparatus - Google Patents

Description

The invention relates to the field of magnetic recording, and in particular to devices for digital magnetic recording.

A device for digital magnetic recording containing information and synchronization buses connected to the code converter, containing a delay element, triggers and logical elements AND and OR, the outputs of the code converter connected via a trigger with separate start to the magnetic recording unit [1].

A disadvantage of the known device is the high level of the low-frequency part of the spectrum of the digital signal.

A device for digital magnetic recording is known that contains information and synchronization buses connected to a code converter containing three universal triggers', five AND elements, four OR elements, and the outputs of the code converter through a trigger with separate triggering, are connected to a magnetic recording unit [2].

The disadvantage of this device is its low density due to the presence of a constant component in the spectrum of a digital signal.

The purpose of the invention is to increase the recording density.

This goal is achieved by the fact that in the device for digital magnetic recording, the code converter contains a four-bit static register, a two-bit shift register and random access memory, the first and second outputs of which are connected to the inputs of the trigger with separate start, the information gate is connected to the information input of the two-bit shift register, the first the synchronizing bus is connected to the synchronizing inputs of a two-bit shift register and four-bit static register, the second clock line is connected to the control input of the random access memory, the first four inputs of which are connected respectively to the outputs chetyrehrazryadno-. static register, the information inputs of which are connected to the third, fourth, fifth and sixth outputs of random access memory, the fifth and sixth information inputs of which are connected respectively to the first and second outputs of the two-digit shift register.

Figure 1 shows the structural diagram of the proposed device for digital magnetic recording; figure 2 is a graph of a time chart.

The device contains an information bus 1 and synchronizing buses 2 and 3 connected to the code converter 1, the outputs of which are connected via a trigger 5 with separate start to the magnetic recording unit 6, and the code converter 4 contains a four-bit static register 1 7, a two-bit shift register 8 and random access memory) 9, the first and second outputs of which are connected to the inputs of the trigger 5 with separate start, the information bus j is connected to the information input of a two-bit shift register 8, the first synchronization bus 2 connected to the inputs of the two-bit timing sdvigayu-; register 8 and four-bit static register 7, the second synchronizing bus 3 is connected. to the control input of random access memory 9, the first four inputs of which are connected to the outputs of the four-bit static register 7, the information inputs of which are connected to the third, fourth, fifth and sixth outputs . random access memory 9, the fifth and sixth information inputs of which are connected respectively to the first and second outputs of the two-row shift register 8. ‘

The device operates as follows.

The input information signal from the information bus 1 is fed to the information input of a two-bit shift register 8, at the outputs of which information signals are generated, delayed by half a res page of the memory, and the signal with per ··! howl synchronizing tire 2 determined 'wish to set up the line number of the memory pages of random access memory 9. In the first four outputs of the' random access memory 9 are generated signals defining the next state code RAM circuit 9, the sixth and fifth outputs kotoro0 _(th pulse sequences are generated, representing a transcoded input information pulse sequence, and on the fifth output, the information is presented in reverse code relative to the information the sixth output of random access memory 9. The pulses from the fifth output of random access memory. device 9 set the trigger 5 with separate start to a single state, and the pulses from the sixth output of random access memory 9 set the trigger 5 to zero. with separate start-up It arrives at magnetic recording unit 6. It records digital information on magnetic media. In the time diagram, the graph with (represents the input information sequence lnost; graphs 5 and B - synchronizing sequences; graphs L and E - information at the outputs of a two-bit shift register B;

graphs e and% - pulse sequences at the fifth and sixth outputs of random access memory 9; graph c - signal at one of the outputs of trigger 5 with separate start, which contains five types of time intervals between adjacent zero-intersections, which are related as a: a; d: b: b, d: c.

Using the proposed device can significantly increase the density of magnetic recording.

clock cycle and a half clock cycle relative to the input information signal. The synchronizing pulses from the first synchronizing bus 2 are fed to the synchronizing inputs of the four-bit static register 7 and the two-bit shifting register 8, the synchronizing pulses from the second synchronizing bus 3, the repetition rate of which is twice the repetition rate of the first synchronizing pulse sequence, are fed to the control input of the operational memory devices 9. The code generated at the outputs of the four-bit static register 7 and two-bit shift register 8, o bounds hell50

Claims (2)

1. US Patent 3560947, cl. 340-174.1, 1971. 2. US patent 4,027,335 cl. 360-40, 1977 (prototype). in "g g g 3