SU775749A1 - Device for digital magnetic recording - Google Patents

Description

(54) DEVICE FOR DIGITAL MAGNETIC

The invention relates to the field of mushroom building, in particular to magnetic recording of digital information on moving media, such as magnetic disks, drums, tapes, and is intended to record electrical signals presented in binary form.

Digital magnetic recording devices are known that generate recording signals comprising three time intervals between adjacent zero-intersections. These devices include a data bus, generator, parts, AND, OR elements, triggers, and a magnetic recording unit. The principle of operation of these devices is based on the conversion of the input binary sequence into a sequence of this type, which, when recorded by the method without returning to zero by the Cj reaction by one, forms a signal in which there are three types of RECORDING

Duration intervals: T, 1.5 T and 2 T (T-cycle duration).

It is known, however, that reducing the number of different types of 1 interval between zero-intersections of a signal is used to improve the conditions for its self-sig- nalization and to reduce the error of the reproduction result; fi}.

The closest in technical essence to the invention is a device for digital magnetic recording, containing a data bus, a master oscillator, AND elements, an OR element, to the output of which a counting trigger is connected, and a magnetic magnetic unit 17,

However, this device is not able to significantly reduce the error of the playback result due to the following reasons. With digital magnetic recordings with high | The clock density is selected near the upper limit of the channel bandwidth, where the amplitude-frequency and phase characteristics are uneven. This leads 3 to the growth of a symptomatic ilteroforonium, which manifests itself in amplitude amplitudes, peak patterns, and lulis-intersection of the signal, in terms of the xaptOKgager by the perpendicular code combination. 11el1 of the invention is able to reproduce the error of reproduction results. , The goal is achieved by the fact that in uh: tpoftonie for the TCH1FORM map recording to the information bus Parallel1: by two inputs and two three-input elements are connected by one input, and two other input elements are connected by inverse inputs and - direct entrances. In addition to TorOf, to the output of the I and Y tail element I, the direct input of which is connected to the information bus, connected to: whose zero set RS input, while the zero code RS is connected to another direct input of the three BHOD element I, which has a direct input connected to the information bus, and a single trigger output is connected in parallel to the other MbiM pr inputs of the other three-input; elements I. To the output of a three-input element I, whose input is connected to the zero output of a trigger, is connected in series with a single installation input by a sprig entered an RS-trigger, one input a third two-input element And, one input a two-input element J-iTIH and one input adder according to the module two The other input is connected to the output of the above mentioned trigger, and the output is connected to the magnet recording unit. At the same time, the free And three-input elements of And are connected to one of the outputs of the master oscillator, the free input of the first two-input element And, the direct input of which is connected to the information bus, to the zero setting input RS-triggered, the output of which is connected to the third two-input element I, are connected to another output of the master oscillator, the free inputs of the remaining two-input elements AND and the single installation input of the RS trigger, whose outputs are connected to the three-input elements AND, are connected to the third the driving oscillator, the outputs of the two-input elements. And the inputs of which are connected to the information bus, and the output of the three-input element And, the direct inputs KI of the second and the corresponding to the I-form I-L-JHHC and the single output of the RS-Trigger, and one of the drivers, Id, I, I, I, I, I, I, I, I, I, I-L-JHHC OR, and the free input of the two-chamber element is connected to the output of the three-input element AND, I1TERSivi (the KOToporxi input is connected to the information bus, On. . 1 shows a block diagram of the device; 2, time diagrams of his work. The device for digital magnetic recording contains a generator 1, to one of which the parallel connects the first two-input element AND 2 and the zero setting input of the RS flip-flop (figure 1). Another output of the generator 1 is connected in parallel with the fl-trigger 4 flush input, the second two-input element I 5 and the third input two-input element 6 directly through the direct input, and the three input elements 7 directly connected to the third output of the generator 1 8.9. The outputs of the elements And 2, 5, 8 combined element. OR S, and the outputs of the elements AND 6, 7 element OR 11, To the output of the element OR S connected in series connected counting trigger 12, one input modulo two 13 and block 14 magnetic recording. The inverse inputs of the elements And 2, 8, 9 are connected to the information bus device. The output of the first element AND 2 is connected to the zero setting input RS - trigger 4, the free input terminals of the elements 7, 8 are connected to the single output RS of the trigger 4, and the free direct input input of the element 9 to the left and left output of the trigger 4 The output of element AND 9 is connected to a single installation input of PS trigger 3, the single output of which is connected to the free direct input of the third element AND 6. The output of element OR 11 is connected to the free input of adder 13. The received information signal (Fig. 2) in which units are represented by high the equal voltage during the cycle, and the zeros, a low level, goes to one of the inputs of the element 2. At the other input of the element I.1, the clock sync pulses are produced and are generated by typing the generator 1. At the output of the element 2, a sequence of ) 1b to carry 1 mp and, pretending to be informational trainers detained with respect to the front borders of ticks at time, equal to 2T / 3. Similarly, using the second element And 5, the sequence of information zeros is generated and, clamped relative to the front edges of the ticks by a time equal to T / 3, this is done using the inverted voltage of the sync pulses and shifted relative to U by T / 3. The clock pulses U also arrive at the p-tsyny setup input of trigger 4 and install it into a single cocTojnnie. A trigger 4 is transferred to the zero state by each pulse U, removed, and "As a result, one voltage from the output of the trigger 4 is formed, the voltage Tsf. The voltage пере, the variable, t, ж is pressed with the voltage and the sync pulses j 7, and on the element with the voltage 15 (ф and U. - on the element And 8, the voltage is simultaneously combined with the voltage u, and the synchro pulses U at the element And 9. At the outputs of the elements And 7, 8, 9 sequences of pulses are formed, respectively, j -g The synchronicity U used at that produced by generator 1 does not differ from U; it is measured by time equal to T / 3. The pulses are used to set trigger 3 to the single-pulse state. The trigger 3 is triggered by pulses (J. The voltage from the single output of flip-flop 3 is removed and... The voltage (1 strobing with pulses U on the AND 6 element, as a result of which the output of the AND 6 element produces a sequence of pulses Ug. The pulses are mixed with pulses U on the element OR; II. The pulses taken from the output of the element OR 11 are frame impulses. Simultaneously the pulses 8 are mixed on the element OR 1U after which they go to the counting trigger 12. The voltage C, "- taken from the output of trigger 12 is summed up modulo ova with U. pulses by an adder 13. The summation modulo pv9 proizvooits by the rule: -13 The voltage taken from the output of adder 13 is written into the block 14 to the magnetic carrier. Record signal 1 ,. contains ov type of time intervals between a neighbor. by their null intersections, related to each other as 1: 1.5. At the same time, large intervals are dissected by pulses with lengths of 7/6 (shaded). Such tie-ins significantly reduce the intersymbol interference, which makes it possible to almost completely restore the is-. Relations between the reproduced signal AND 14 intervals. When no frames are missing, the right-to-right ratios between the reproduced signal intervals are broken in the recorded transducer. About p rumula of the invention. The device is a digital magnetic magnetic aaniicii containing 1 information bus) -; the generator, the elements AND, the ele -; enta OR, to the output of which the counting trtgter is switched on, and. magnetic recording unit, in order to reduce the playback result error, to the 1tformanianon bus, in parallel, the two inputs and two three-input elements of the two inputs, the second two-input and three-input elements of the input And are connected by inverse inputs, and the other elements And - the direct inputs, in addition, to the output of the first two-input element, And, whose direct input is connected to the information bus, is popped by the zero setting input RS trigger, while the zero output The RS trigger is connected to another direct input of the three-input element I, one direct input of which is connected to the information bus, and the single output of the trigger is connected in parallel to the other direct inputs of the remaining three input elements of I, and to the output of ipexBx-output element And, the input of KOTOpoixi to zero output thrngerp.

connected in series by a single installation input are another RS entered, a trigger, one input a third two-input element AND, one input a two-input OR element, and one input a modulo two adder, the other input of which is connected to the output of the said counting trigger, and the output to the magnetic input records, while the free inputs of the three-input elements And are connected to the terminal of the outputs of the master oscillator, the free input of the two-input element And, the direct input of which is connected to the information bus, and zero Set the RS input. -trigger, the output of which is connected to the third dowthruck element And, is connected to another output of the master oscillator, and the free inputs of the remaining two input elements And, and a single installation input RS - trigger, the outputs of which are connected to the three-input elements And, are connected to the third output of the oscillator, outputs two-input elements And, which inputs

connected to the information bus, and you, the course of the three-input element And, whose direct inputs are connected respectively to the ft information bus and to the single output of the RS trigger, are combined

the inputs of the said three-input element OR, and the free input of the two-input element OR Connected to the output of the three-input element AND, the inverse input of which is connected to the information bus.

Sources of information, green in attention in the examination

I. Patent of Great Britain No. 1352052, cl. G 4 C, published, 1974. 2, Problems of Radio Electronics, Seri "

Electronic Computing Technology. 10, 1971, p. 30-46 (prototype).

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Claims (1)

Claim A device for digital magnetic recording, containing an information bus that sets the generator, · AND elements, OR elements, to the output of which a counting trigger is connected, and. a magnetic recording unit, in that, in order to reduce the error of the playback result, two inputs of two new and three three-input elements And are connected to the data bus in parallel with one input, and the second two-input and one three-input elements AND are connected with inverse inputs, and the rest of the elements And - direct inputs, in addition, to the output of the first two-input element And, the direct input of which is connected to the information bus, is connected to the zero installation input RS trigger, while the zero output is three gegra is connected to another direct input of the three-input element And, one direct input of which is connected to the information bus, and a single output of the trigger is connected in parallel to other direct inputs of the other three-input elements And, and to the output of the three-input element And, the input of which is connected to the zero output of the trigger, 7 775749 connected in series connected by a single installation input, another input · ^ ·. -trigger, one input of the third two-input element AND, one input two-input element OR and one input 5 adder modulo two, the other input of which is connected to the output of the mentioned counting trigger, and the output to the magnetic recording unit, while the free inputs are three-way 10 And elements are connected to one of the outputs of the master oscillator, the free input of the first two-phase element And, the direct input of which is connected to the information bus, and the zero input * is the 15th RG input. -trigger, the output of which is connected to the third two-input element And, connected to another output of the master oscillator, and the free inputs of the remaining two-input ²⁰ output elements And and a single installation input-trigger, the outputs of which are • connected to three-input elements And, connected to the third output of the master oscillator, the outputs of the two-input elements And, the inputs of which are connected to the information bus, and the output of the three-input element And, the direct inputs of which are connected respectively ft information bus and a single output RG -trigger, combined by the inputs of the three-input OR element, and the free input of the two-input OR element connected to the output of the three-input AND element, the inverse input of which is connected to the information bus.