SU1760543A1 - Device for magnetic record of binary information - Google Patents

Abstract

The invention relates to instrumentation, in particular to a magnetic recording technique. The purpose of the invention is to increase the recording density. The goal is achieved in that a device for magnetic recording of digital information, containing a pulse generator 1, a counter 2, a multiplexer 3 (a coding unit) and a shaper 4 bipolar pulses, is inserted into a trigger 6 (three-digit) switched on before entering the coding unit 3. 3 tab., 3 Il.

Description

The invention relates to instrumentation, in particular to a magnetic recording technique, and can be used in recording and storing information equipment of measuring and computing systems.

It is known a device for a magnetic moment, containing in a certain way connected two triggers, two elements EXCLUSIVE OR, an element NOT and an element of coincidence.

This device does not provide high-density recording due to distortion of the reproduced signals.

Closest to the present invention, there is a magnetic recording device comprising a pulse generator connected to the counter input of the counter, the corresponding address inputs of the multiplexer (coding unit) are connected to the fourth section of the counter.

the input information bus is connected to the input, the unit potential bus is connected to the second and sixth inputs, the zero potential bus is connected to the remaining inputs, and the bipolar pulse driver that has the output information bus connected to the output, and the output clock bus is connected to the higher counting output counter.

This device does not provide high-density recording due to the low mapping capacity of the realizable method and due to distortions of the reproduced signals.

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

The goal is achieved by the fact that in a device for magnetic recording of binary information containing an input information bus, a pulse generator,

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connected to the counter input of the counter, to the counter bits of which the corresponding address inputs i s of the coding block, the output of which is connected to the output information bus, are connected, and the output clock bus is connected to the upper counter section of the counter, a three-bit trigger is inserted, and the input information bus connected to the inputs from the first to the third coding block and the trigger, to the outputs of which the inputs from the fourth to the sixth coding block are connected, and the output –act act is connected to the trigger input of the trigger ova tire.

The recording is made with short rectangular pulses of alternating polarity.

FIG. a block diagram of the device; 2 and 3 are timing charts of the recording and playback signals.

The pulse generator 1 is connected to the counting input of the counter 2, to the counting bits of which the corresponding address inputs of the coding unit 3 are connected. A shaper of 4 bipolar pulses is connected to the output of the latter, to the output of which the output information bus 5 is connected. To the most significant counter of counter 2, a clock input of trigger b and an output clock 7 are connected. 6 and to the lower inputs from the first to the third coding block 3, the higher inputs from the fourth to the sixth of which are connected to the corresponding, from the first to the third, outputs of the trigger 6.

The device works as follows.

Counter 2 operates in the pulse counting mode from generator 1 (six-digit count). The clock signal from the senior counting output of the counter 2 via the clock bus 7 enters the information source (not shown in the figures). In trigger 6, information signals arriving on bus 8 from the source of information are delayed by one cycle. Information signals are received from the source on a three-bit bus 8.

Depending on the state of the signals at the address inputs (from the counter) from the information bus and the trigger at the inputs of the coding unit 3, a pulse sequence (signal B) is formed in accordance with Table 1.

Pulse sequence B generates pulses G of alternating polarity (signal G) on a magnetic head for recording on a magnetic recording medium (in the figures, the head and the carrier are not shown). Table 2 shows an example of coding block 3 (performed on ROM) following the group 5 (110) after group 5 (4110) and group 5 (110) after group 6 (101).

Table 2 shows the coding block

3 for single signals B (pulses in a sequence), for the remaining address-cos - zero signals.

In groups 1, 2, 3 and 7, the first impulse is formed through 0.6 T from the beginning of the clock period, if these groups follow after (after groups) groups 6 and 7. In groups 5 and 6, the first impulse is set 0.4 T from begin by following these after groups 6 and

7

The signals recorded on the carrier in the form of a bundle of three pulses of alternating polarity have a duration of 1.5 T and 2 T. The three-interval reproduced signal with a duration of time intervals between zero transitions of 1 T, 1.5 T and 2 T. All the information contained in the playback signal (FIG. 2D and AP) transfer the intersection points (null transitions)

this signal with the axis of symmetry. This signal possesses self-synchronization and a detection window of ± 0.25 T. Decoding of the information sequential ™ signals and the extraction of clock pulses are carried out from the generated reproduction signal (Fig. 2E and WE) in accordance with Table 3.

By changing the pulse formation intervals at the beginning of the groups, the distortion of the reproduced signals is reduced.

The technical and economic effect of the invention is to increase the density

write 2.25 times (125%) compared to the prototype by changing the recording implementation conditions (reducing the recording clock interval from T 1.5 d / V to T 1 d / V, where 5 is the size of the working gap; V - media transfer speed of 1.5 data capacity increase (super total effect).

A reduction in the duration of the clock interval was achieved by changing the minimum intervals between recording pulses from 0.25 T to 0.4 T compared with the prototype.

As the base object, the min-CNML of the type EU-5091 (PNR) with a density of

Records up to 100 bits / mm. The proposed method provides for recording on a tape tape recorder at a frequency of 17 kHz, which corresponds to a density of 500 bits / mm, i.e. achievable density is 5 times greater.

The greatest effect of the proposed device is achievable when using a universal magnetic head.

Claims (1)

The invention is a device for magnetic recording of binary information containing input information and output clock bus, pulse generator connected to the counter input of the counter, all of which are connected to the corresponding address inputs of the coding unit, the output of which is through the bipolar pulse generator sub0 five The keys to the output information bus are characterized in that, in order to increase the recording density, a three-bit trigger is introduced, the first, second and third inputs of which are connected to the input information bus of the main, second, and third inputs of the coding block, fourth, fifth and The sixth inputs of which are connected respectively to the first, second, and third outputs of a three-bit trigger, the clock input of which is connected to an additional counting discharge of the counter in the output clock bus. Recording signals Coding block 3 Group Signal AO A1 A2 A3 No. A5 Table 1 table 2 Xi X2 HZ M X5 Hb B Table 3 ,, / w J 46 t "- - & 4tf one J.SU Jsff J.6% J, Ј Z tffЈ LЈ eleven I ii 11 iifr .J.P aeoaa V J.L 2 Ј Ј J  tjf i niiMiF fefflffigga J, S i J.S (l J J.S 0 dS O J. & J, & JLL Ј J, S Ј II  I 9 dt Lfr