RU1839269C - Method for magnetic recording of digital information and device for implementation of the method - Google Patents

Abstract

The invention relates to the accumulation of information, in particular to the magnetic recording technique. The aim of the invention is to increase the recording density. The magnetic recording device comprises a pulse generator 1, a pulse counter 2, an encoding unit 3, a bipolar signal driver 4, an output bus 5, an input 6 and a clock 7 buses, a shift register 8, a trigger 9, a multiplexer 10, a driver 11, an element 12, element OR 13. element AND 14. The device provides three-interval recording with an offset multiplicity of high-density samples. 1-2-3-4-5, 6-8-9-10-13-14-3, 8-11-9.2-7,7-8-8.10-Z 8-11-9.2-14. 3 ip.

Description

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The invention relates to the accumulation of information, in particular to magnetic recording technology, and can be used in information recording systems and external storage devices of computer technology.

A known method of magnetic recording, including the formation of pulses of alternating polarity in the intervals 1 T, 1.5 T and 2 T, where T d / V is the clock period of the recording signal; d is the magnitude of the working gap of the magnetic head; V is the magnitude of the magnetic carrier velocity 1J. In this case, a pulse is generated in the interval 1T through 0.5 T or 0.6 T in the intervals 1.5T, 2T - three pulses each.

The disadvantage of this method is the reduction in recording density due to the uneven sequence of intervals of different durations.

A device for magnetic recording containing a pulse generator, a counter, an encoding unit, a bi-polar signal generator, an output bus, a trigger, an OR element, an input and clock bus, an element NOT connected in a certain way

2.

A disadvantage of the device is the limitation of the recording density due to the influence of intersymbol distortions in the unevenly distributed intervals of the recording signal.

An object of the invention is to increase the recording density.

The goal is achieved that in the method according to ed. Ev. USSR No. 1748183 when recording the next two information lines 1 in the 2T interval, the signals of the combination 101, including the odd 1, are recorded with pulses of alternating polarity in two 1.5T and 2T intervals.

In order to realize the advantages of this method, a digital information magnetic recording device containing a pulse generator is connected to the counting input of a pulse counter, the counting bits of which are connected to the corresponding address inputs of the encoding unit, the output connected to the output bus through a bipolar signal generator, input and clock buses connected respectively to the information and clock inputs of the shift register, the first and second outputs of which are connected respectively to the first and second th trigger inputs, an OR gate, one input of which is connected to the first control input of a pulse counter, a single bus and a common bus connected to the first, fifth, seventh and eighth inputs coding block NOT element, the input coupled to the first output

trigger, shaper, multiplexer and AND element are introduced, connected to the tenth input of the coding block by the output, the third, fourth and ninth inputs of which are connected to the common bus, the sixth input-to

unit bus, the second input - to the nth output of the pulse counter and one U input of the And element, while the third output of the shift register is connected to the third input of the trigger and through the former to the clock input

5 triggers, the first, second and third outputs of which are connected respectively to the first control input of the multiplexer connected to its first input, the second control input and the fifth input of the multiplexer, the second, third and eighth inputs of which are connected to a common bus, the fourth input - to the output of the element NOT, the sixth and seventh inputs - to the unit bus, the first output - to the first control input of the pulse counter, the second control input of which is connected to the second output of the multiplexer and another input of the OR element, inverse output which is connected to another input of the element

0 and.

In FIG. 1 is a diagram illustrating a magnetic recording method; in FIG. 2 is a diagram of a magnetic recording device; in Fig.3 - diagrams of its time diagrams

5 works.

The method is as follows ...

The signals of the initial information sequence are converted into an intermediate three-interval signal A with a mixed multiplicity of samples (time intervals) of this signal equal to P, 1.5T and 2T, where T is the duration of the clock period of the recording signal. Informational

5 tons (an even number) correspond to signals having intervals of 2T duration (interval 11 corresponds to two 11). In the bit positions of information O and individual, as well as odd 1 in

0 sequences form intervals of 1T and 1.5T, respectively. A three-bit combination of 101, i.e. single O and two adjacent 1, correspond to two intervals of 1.5 and 2T duration.

5 For a 1T interval, one recording pulse is generated at 0.5T from the beginning of the interval. Over 1.5T and 2T intervals, three recording pulses are generated. In this case, for a 1.5T interval, pulses are set at intervals of 0.4T, 0.9T and 1.3T from the beginning of the interval, and for a 2T interval, at 0.5T, 1, 3T and 1.7T. The first pulse of the 1.5T interval is set through O.ZT, if this interval follows the interval IT (2T). In the 1T interval, a pulse is generated at 0.6T if this interval follows after the 1.5T interval and before the 1T (2T) interval.

Recording to the medium is carried out by rectangular pulses of alternating polarity with saturation of the medium, and recording by the old non-erased signalogram is possible.

The magnetic recording device (Fig. 2) comprises a pulse generator 1, a pulse counter 2, an encoding unit 3 connected in series) a bipolar signal generator 4 and an output bus 5, as well as an input 6 and a clock bus 7 connected to the inputs of the shift register 8, the outputs of which are connected to the inputs of the trigger 9. In addition, the device contains a multiplexer 10, the outputs connected to the corresponding control inputs of the counter 2 pulses, shaper 11, connected between one of the outputs of the register 8 and the counting input of the trigger

9. element NOT 12, connected between one of the outputs of the trigger 9 and one of the inputs of the multiplexer .10, element OR 13, element AND 14 associated with the multiplexer

10. counter 2 and coding unit 3, the corresponding inputs of which are connected to a single and common bus.

The device operates as follows. ./..- -; - I ... - -. . - ::.

Counter 2 operates in pulse counting mode from generator 1 (counter 1 is 6-bit with a conversion factor multiple of 10). The signal (A3) from the fourth bit of counter 2 is clock for an external information source (not shown), in register 8 information is entered bitwise on the clock signal A3. From an external source, the signals are sent to register 8 via bus 6. To trigger 9, when recording signal O and G (signals U1 and Y2), OG and 10 are input bit by bit for each IT and 1.5T periods. When the code U1, U2 11 form the interval 2T, and the clock signal B (Fig. 3) form after two bits. When the code is formed

3.5T interval, during which six recording pulses are generated. The information signals of the formation of the recording pulse sequence are signals on

trigger outputs. Multiplexer 10 transcodes information signals (see Fig. 3). Signals D1, D2 set the division coefficient of the counter 2. Signals D1, D2 - 00 correspond to ten

counter 2 cycles (interval 1 T), 01 (1.5T) signals - 1.5 cycles, 10 (2T) signals - 20 cycles, and 11 signals (3.5TJ-35 cycles).

The coding unit 3 generates a sequence (Fig. 3, B), according to which the driver 4 generates pulses (Fig. 3, D), which are supplied to the magnetic head via the write bus 5. The signal A3 at the input of block 3 is the previous one and is used to temporarily correct recording signals. /.: ..;. ;. : ...:. , ..,: ... When playing back to the IT interval, the bit corresponds to information O, HHV to interval 1LT - bit information 1,

the 2T interval is bit 11, two 1.5T intervals, 2T (1.5-2 h-3.5T) corresponds to the three-bit group 101. Decoding is unambiguous. It is possible to resume decoding on any

information site. No accumulation of errors. : .. i-t The information capacity of the reproduced signal when recording the sequence 101 (two G per one O) is 1.7

bit / period.

The greatest effect is achieved when using universal magnetic

heads. - ;;; -::, -. .. /.-. .- -. . ; ..: .-. An EC-5091 miniKNML with a maximum recording density of up to 100 bit / mm was selected as the base object; the proposed device provides recording on a cassette DPM with a frequency of 17 kHz, which corresponds to a density of 550 bit / mm, i.e. at 5.5

times higher.

(56) 1. USSR copyright certificate Kfe 1748183. cl. G 11 B 5/09. 1990.

2. Copyright certificate of the USSR No. 1647632. class. G 11 B 5/09. 1989.

Claims (2)

1. Cnocob magnetic recording of digital information by ed. No. 1748183, characterized in that, in order to increase the recording density, when recording the next two sub-series of information T in the interval 21, the signals of the combination 101, including the odd 1 of the information sequence, are recorded by rectangular pulses of alternating polarity in two time intervals of duration 1 5 - 2T. 2. A device for magnetic recording of digital information, containing a pulse generator, connected to the even input of the pulse counter by the output, the counting bits of which are connected to the corresponding address inputs of the coding unit, the output connected via the bipolar signal generator to the output bus, the input and clock buses connected respectively, to the information and clock inputs of the shift register, the first and second outputs of which are connected respectively to the first and second inputs of the trigger, element: OR, one turn is connected to the first control input of the pulse counter, the unit bus and a common bus connected to the first, fifth, sedmr0 5 0 5 0 mu and eighth inputs of the encoding unit, an element NOT connected to the first output of the trigger with an input, characterized in that, in order to increase the recording density, a shaper, a multiplexer and an element And connected to the tenth input of the encoding unit are inserted into the output, the third, fourth and the ninth inputs of which are connected to the common bus, the sixth input to the unit bus, the second input to the fifth output of the pulse counter and to one input of the And element, while the third output of the shift register is connected to the third input of the trigger and through the shaper the trigger input of the trigger, the first, second and third outputs of which are connected, respectively, with the first control input of the multiplexer connected to its first input, the second control input and the fifth input of the multiplexer, the second, third and eighth inputs of which are connected to the common bus, the fourth input - to the output of the element NOT, the sixth and seventh inputs to the unit bus, the first output - to the first control input of the pulse counter, the second control input of which is connected to the second output of the mul-1 typlexer and another input of the element; OR, whose inverse output is connected to another input of the element I.