SU758242A1 - Device for recording information onto magnetic carrier - Google Patents

Description

The invention relates to computing and can be used in storage devices on magnetic disks, drums, tape.

A device for recording information that implements a method of recording a modified phase modulation (IMF) [1].

The disadvantage of a recording device that implements the IMF method is that when extracting information from the playback signal, a detection window is provided for not more than ± 0.25 T, where T is the duration of one digital position in the information signal at the input of the encoder or signal conversion before recording. The information capacity of the IMF signals is two bits in a period.

The closest in technical essence is a device for recording information on magnetic media containing a synchronization unit connected to a shift register, to the outputs of which a set of elements AND connected by an element is connected. OR, the output of which is connected to the counter [2 ^.

2

During playback, self-synchronization is provided as well. detection window when ^- the allocation information is ± 0,4 T informative sig5 catch - 1.6 bits per period.

The disadvantage of this device is that it does not allow to obtain the information capacity of signals equal to two bits in a period.

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

The goal is achieved by the fact that the input of the first element I is connected to the unit output of the third third trigger, its shift register register, the inputs of the second element I are connected to the zero outputs of the auxiliary triggers of the second and third bits and the unit output of the fourth trigger of the fourth digit, the inputs of the third element I connected to the zero outputs of the main triggers' of the second and third digits and the single output of the main trigger of the fourth discharge, the inputs of the fourth element I are connected to the single output for the main trigger of the second digit and zero outputs of the main trigger of the third and fourth digits, the inputs of the fifth ele758242 4

The information signal arriving at the recording is sent to the syn'Hronietion unit 1, which ensures the exact coincidence of the phases of the impulses of the series and the information. ' The device uses two-phase synchronization. From the output of the synchronization unit 1, information pulses of information and recording series C1 and C2 (FIGS. 2 a, b, c) are fed to a four-bit shift register 2, the outputs are fixed. 10 new and auxiliary triggers of which (Fig. 2 g, d, e, g, s, u, k, l) are connected to the inputs of the elements And 3-9. The output signals of the elements And (blocks 3-9) is shown in FIG. 2 m, nd, o, p, p, c, t.

- * The pulses from the output of the element And block 7 (Fig. 2 p) are fed to the counting input of the additionally introduced counter 10 to 8 — the input of which impulses from the output of the element And 8 20 (Fig. 2 s). The zero output of the additionally inserted counter 10 (FIG. 2y) is gated in the And 11 element with signals O of the outputs of the And 9 element (FIG. 2f) ·. The outputs of the elements And 3-8'i And 11 sub25. to the inputs of the element OR 12, the output of which (Fig. 2 x) is fed to the counting trigger recording 13. Paraphase signals from the trigger output .. · Recording (Fig. 2c) are fed to the recording amplifier 14.

In the signal from the recording amplifier 14 (Fig. 2c), reel groups appear. Dov current with switching period ,, 0,5 T, containing an odd number of drops (3 or 5). These groups are separated from each other and from other sequences by 1T intervals on both sides. In all the other sequences, the current differential will give a differential that is separated from the other by 1T and 2T intervals.

In the recording signal, the largest interval between current drops is limited to 2T (the number of consecutive nulls in the sequence is limited to one zero).

If the frequency of the sync serials generated by the synchronization unit is equal to 50 at P, then the highest frequency of the recording signal is also G. This signal has a frequency when recording sequences of zeros consisting of two • zeroes or more, when in the signal of "Or five differences, following at a distance of 0.5 T.

The frequency P is chosen in such a way that, on the frequency response of the playback of a head-carrier pair, it will be close to the top '/'''^:;'^; Trains 1XY'YLI 'outside of the bandwidth, for example, at the level of minus 10-18 dB.

When playing back, the signals from C, H, and T will be noticeably weakened or ^;

'3' .....

. ment and.

the main triggers of the second, third and fourth digits, the inputs of the sixth element And are connected to the single output of the auxiliary trigger of the first discharge and the zero outputs of the auxiliary triggers of the second and third digits, the inputs of the seventh element H are connected to the zero- ¹ 'Left outputs of the auxiliary triggers, first, second, third and / fourth digits, the output of the fifth

An I-cell is connected to the Counting input of an additional-entered I-meter, the input of which is connected to the respiration of the sixth element I, and the zero output is connected to the input of the eighth element. ment And, the second input of which is connected to the output of the seventh element I.

FIG. 1 shows a block diagram of an information recording device.

FIG. 2 - time "charts" of the recording signals.

The device consists of a synchronization unit 1, the shift register 2, the elements And 3 (the first element I),

4 (the second element I), 5 (the third element I), b (the fourth ^{is the} element I), 7 (the fifth element I) _; 8 (the sixth element And), 9 (the seventh element And), additionally entered the counter 10, the eighth Element And 11, the element OR 12, the record counter 13, the amplifier record 14, the magnetic head 15) of the recording medium 16.

The shift register has bits · I, О, Ф, '3, in' each digit there is a main and auxiliary Trigger. The drawing shows their outputs: one // Personal ’output’ 17 / DEPT “1” trigger нулев '/ zero output 18 auxiliary 1-point trigger; single output 19 main trigger | discharge; zero output of 20 basic trigger; discharge; zero output of 2.1 auxiliary trigger “discharge / unit output 22 of the main trigger β of discharge; zero output 23 of the main trigger of discharge, zero: output '24. auxiliary trigger "IG discharge; single output 25 of the main trigger-discharge circuit; zero output; 26 main trigger of the fourth discharge; single output 27 of auxiliary trigger of the fourth discharge; zero output. 28 auxiliary trigger IV discharge. · - · - '·

Elements And have inputs 22 (first element And) 21 *, 24 ^ 2 7 '(second element And), 20 * 7 23 ^g , 25 (third element And), 19', '2 3' 26 '(fourth element And ) 2 0 ', 2 3 ί 2 b * (fifth eu.ment I) 17', '21 ^g 24 * (sixth element I) 18', "21 ', 24', 28 '(seventh element I). ..

The device works as follows.

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will not be reproduced by ourselves. ' · ''

In the reproduced signal, the intervals between the pulse peaks can have three values: 1Т, 2Т, ЗТ (Fig. 2c).

The use of a recording device will make it possible to increase the recording density by about 20% compared to the density achieved by using a device implementing the 4/5 BBHM method, increasing the detection window to + 0.5 T {in the known device + O, 4 T).

Claims (1)

Claim A device for recording information on magnetic media containing a synchronization unit connected to a shift register, to the outputs of which a set of elements AND connected by an OR element are connected, the output of which is connected to a recording counter, characterized in that, in order to increase the recording density, the input of the first element And, it is connected to the unit output of the main trigger of the third digit of the shift register, the inputs of the second element I are connected to the zero outputs of the auxiliary triggers of the second and third bits and the unit one ode fourth auxiliary trigger discharge input and the third element are connected to the outputs of the main triggers zero vtdrogo and third bits and the output of the main trigger unit chet5 VERT discharge inputs of the fourth AND gate connected to the output of the main unit of the second flip-flop - discharge and zero outputs of the main triggers of the third and fourth times of the 10 rows, the inputs of the fifth element And are connected to zero outputs of the main triggers of the second and fourth digits, the inputs of the sixth element And are connected to the single output of the auxiliary trigger of the first 5th discharge and zero outputs of the auxiliary triggers of the second and The third bits, the inputs of the seventh element And connected to the zero outputs of the auxiliary triggers of the first, second, second, third and fourth digits, the output of the fifth element And connected to the account the input of the additionally inserted counter, the 8-input of which is connected to the 'output of the sixth 25 elements And, and the zero output is connected to the input of the eighth element And, the second input of which is connected to the output of the seventh element I.