SU1513511A1 - Device for magnetic recording of binary information - Google Patents

Abstract

The invention relates to instrumentation, in particular to the accumulation of information, and can be applied in external storage devices. The aim of the invention is to increase the recording density. The device contains a generator 1, a counter 2, a multiplexer 3, a counting trigger 4, a shaper of bipolar pulses 5, elements AND, OR, NOT. The purpose of the invention is achieved by recording "zero" with a period of 1T, recording of "one" with a period of 1.5T and recording of a "pause" with a period of 2T. At each clock period, a write pulse is formed at a time of 0.5T from the start of the period. When recording "units" and "pauses", two additional write pulses are additionally formed through time, respectively 0.75T, 1T and 1T, 1.5T. 2 Il.

Description

one

(21) 4321727 / 24-24

(22) 10/27/87

(46) 10/07/89. Bul N 37

(71) Chel Binskir Polytechnic Institute named after Leninsky Komsomol

(72) V.N.Tetyuyev and M.V.Kondratyev

(53) 681.327.6 (088.8)

(56) USSR Author's Certificate N 1229809, cl. G 11 B 5/09, 1986.

USSR Author's Certificate No. 1378076, cl. G 11 B 20/10, 1987.

(54) DEVICE FOR FAGGET RECORDING Binary INFORMATION

(57) The invention relates to instrumentation, in particular to the accumulation of information, and can be applied

in external storage devices. The aim of the invention is to increase the recording density. The device contains a generator 1, a counter 2, a multiplexer 3, a counting trigger 4, a shaper 5 bipolar pulses, elements AND, OR, NOT. The purpose of the invention is achieved by recording zero with an IT period, recording a unit with a period of 1.5T, and recording a pause with a period of 2T. At each clock period, a write pulse is formed at a time of 0.5T from the start of the period. When recording units and pauses, two additional write pulses are additionally formed through time, respectively, 0.75T, IT and IT, 1.5T. 1 tab., 2 Il.

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cl

SP

with

ate

3151

The invention relates to instrumentation, in particular to the accumulation of information, and can be applied in external storage devices.

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

Figure 1 shows a diagram of a device for magnetic recording of a binary

information;, figure 2 - the time frame of the device operation.

The device (fig.O contains a generator 1, a counter 2, a multiplexer 3, a counting trigger 4, a shaper 5 bipolar pulses, information output 6, element OR 7, clock output 8, information input 9, element 10, element 11 and 11 marker input 12.

The device works as follows.

Zero recording is carried out with a period of IT (unit C) - with a period of 1.5 T and an interval (P) - with a period of 2 T. For each clock period, a recording pulse is formed through a period of 0.5 T from the start of the clock period. When recording units 1 and pauses, two pulses are additionally formed, respectively, at intervals of 0.75 T, IT and IT, 1.5 T.

The recording is made by forming short rectangular pulses of alternating polarity with saturation of the magnetic carrier from + BI to B (without preliminary demagnetization of the carrier, i.e., on the old wake.

When following the write pulses through 1T intervals, the reproduced signal has an IT duration. Maximum recording density is provided when recording with short rectangular pulses of alternating field p

if the magnetic footprint is commensurate with the clearance of the working gap of the magnetic head, i.e. lyi dl where 1o is the length of the magnetic footprint, and (is the gap of the working gap of the magnetic head, taking into account the oscillations of the distance between the magnetic carrier and the magnetic head and the scattering of the recording field, 1.5-2), where T) is the period equivalent to the gap of the working gap of the magnetic head, V is the speed of the magnetic carrier When recorded in three pulses in a pack with a duration of 0.5 T for a period of 1.5 T (the intervals between pulses

0

0

with

five

0

five

0

five

0

in a pack equal to 0.25 T), as well as in a pack of IT duration over a period of 2T (the intervals between pulses are 055T) the reproduced signal L has a duration of 1.5 T and 2T, respectively, since the pulse following density in the pack is higher than the resolution of the playback head and it responds to the total flow. The second and third signals perform the role of bias signals.

The reproduced signal L (figure 2) three-interval (three-frequency) with a multiplicity of intervals equal to 1: 1, 5: 2. The information capacity of the reproduced signal is 4/3 bit / period.

The decoding of the reproduced signal L is carried out with self-synchronization, which is reduced to the selection of clock pulses from the generated signal M (Fig. 2) of reproduction. All information contained in the signal transfers the intersection points of this signal with the axis of symmetry. The detection window is 0.5 T.

The synchronization of the device is carried out from the clock generator 1. The duration of the clock periods is set by changing the division ratio of the counter 2. The period 1T corresponds to four cycles, 1.5T - six and 2T - eight cycles. The formation of intermediate pulses is carried out by coding the multiplexer in accordance with the table (the gate-input is used to clock the multiplexer).

The recording pulses are formed on the edges of the signal I (Fig. 2), which receive, passing the intermediate pulses E, from the output of the multiplexer 3 through the trigger 4. Information signals A and the marker signal G (Fig. 1) are input to the device by the clock signals B .

The technical and economic effect of the invention is to increase the recording density by 33% compared with the known device.

Claims (1)

Formula of gain A device for magnetic recording of binary information, containing a generator- whose output is connected to the synchronous clock of the counter, the first output of which is connected to the strobe input of the multiplexer, address inputs 515 whose connections are second and third and the fourth output of the counter, and the output of the multiplexer is connected to the input of the trigger counter, the output of which is connected & the input of the bi-polar pulse generator, the output of which is the information output of the device, the third and fourth outputs of the counter are connected to the inputs of the OR element, the output of which is the clock output of the device, the HE element, characterized in that It has an AND element, the first input of which is an information input. Coding Zero (,) XI X2 XS E Unit coding (,) X1 X2 XS E Gap Coding () XI X2 XS E sixteen the device’s home, the second input of the AND element is the marker input of the device and is connected to the input of the HE element, the output of which is connected to the seventh information input of the multiplexer and to the second control input of the counter, the first control input of which is connected to the output of the AND element and to the fourth the information input of the multiplexer, the first, second, sixth and eighth information inputs of which are the bus logical zero, and the third and fifth information inputs are the bus of the logical unit. FIG. g