DE1499592A1 - Data verification device - Google Patents

Description

F.Weickmann, Dr. Ing.A.Weickmann, Dipl.-Ing. H. Weickmann Dipl.-Phys. Dr. K. Fincke patent attorneys

8 MUNICH 27, MoHtSTRASSE 22, PHONE NUMBER. 483921/22 λ, Π Ω C fi O

KRBM Munich, October !!, 1966

Ampex Corporation, * t01 Broadway, Redwood City, California 6 * t063 «USA

Data verification device (system for data comparison check ung)

This invention relates to magnetic recording and reproduction and, more particularly, to devices and systems for verifying digital data patterns or rasters recorded on a magnetic medium. Although the technology of magnetic data recording is sophisticated, the magnetic recording systems and their media continue to cause errors. For example, a magnetic tape can cause the read voltage to rise or fall due to the uneven distribution of the oxide particles in the tape. These errors can especially when processing commercial! The statistical values close

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be tolerated. Therefore, one uses to eliminate them usually complex error checking circuits, including the usual long tudinals and verticals Parity and equality checks. It is already known that the tape is in a kind of preliminary examination before his Commissioning or takes place periodically, based on the presence of read voltage failure or read voltage drop areas to check and these areas by polishing, cleaning or other procedures on a permissible time to reduce. Nevertheless, the magnetic medium used for recording cannot be perfectly manufactured, and it can be the result of an incomplete distribution of the magnetic particles, due to wear and tear or due to external interference factors such as abrasion-related defects reduced but not avoided. Simultaneously with the continuous improvement of the magnetic recording media, the demands placed on these media are increasing with regard to the information density and the relationship between signal and background noise.

The best way to verify correct data logging is of course made by the magnetic element itself. Errors in this element can lead to that when a certain signal is fed into the magnetic Recording head of the magnetic tape making the recording of the pattern corresponding to this signal is prevented. It is of course possible through already known processes, which are carried out using special

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ler transformer combinations work after the layout the Einchrelben to make · playback transmitter can but not so close to the recording gap that electronic storage systems are unnecessary. A recorded information block can be read out in the same or in the opposite direction and compared with the desired information. However, this data comparison check or verification technique is required both significant storage capacity and one remarkable expenditure of time · t

It is also known to those skilled in the art that these are available. Aid for a considerably longer period of time and on * require more maneuverable equipment to perform the verification «than is desirable. These resources are sufficient not even the needs as they occur with modern asynchronous recording systems «in which the Data in an even sequence, one character at a time or a symbol at a certain point in time on a intermittently transported recording element can be summarized · In recent times is in increasing The extent to which the use of digital, step-by-step magnetic tape recording systems can be determined «ever recorded data character or symbol a tape certain time each by the amount of a so-called. Transporting data cell · The increasing use of this The recording device is essentially based on the fact that the intermediate storage or processing of these rides

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Editing of the final input data is not required. The characters can be recorded at a speed whose value can be selected between approximately zero and relatively high amounts (e.g. 650 characters per second or more) Since these systems represent an essential part of the data processing devices mentioned above, they should be easy to produce and work immediately in operation. Accordingly, it is highly desirable to be able to check the data actually recorded on the tape without tearing apart the normal stepped operational sequence or without additional effort. It is also desirable to be able to record the data in a standardized recording format such as 200,556 or 800 bits / 2.5 ¹ + cm, so that the recording is in a format comparable to the computer and without special converter circuits with the same or can be played back by other facilities.

The present invention is based on the object to provide a data verification system for a data processing system.

The invention is also based on the object a device for reading out the digital data written on a magnetic recording medium create. Another object of the invention is a magnetic transmitter for recording * systems 9098 /; /; / 137 2

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to create. Another object of the invention is to provide a system for a step-by-step drawing digital system «which is used for the direct reading of the data by a magnetic head on a magnetic tape recorded data. Finally, it is another object of the invention to provide methods to verify data »recorded on magnetic tape or other magnetic recording element are"

To achieve these objects, the invention provides a magnetic head arrangement "which has a gap" which comprises a path length "which is equal to or greater than the length of a recorded data cell in a device of the type mentioned at the beginning. The transmitter, excited by a pulse, applies a magnetization pattern of a desired length to the recording medium. The recording medium can be in the rest position. However, a short excitation pulse can also be used when the recording medium is moving. The recording current is discontinuous, whereby the same transmitter is used for playback when the recording medium is in motion. Due to the length of the magnetization pattern relative to the gap width of the transducer, at least part of the magnetization pattern remains at least briefly in the area of the transducer gap, so that the magnetic flux emerging from the recording medium enters the magnetic circuit of the transducer 909844/1372

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penetrates. The magnetic flux induced thereby in the Lesebzw. Playback winding of the transformer a stream «der the actual magnetization pattern of the magnetic tape corresponds to · A reproduction signal deviation, which represents the stored bit, is used to generate a data pulse which is compared with the signal that is to be recorded »making the immediate Verification takes place. The transmitter can also be referred to as a device with a large gap width.

According to the invention, the pulse excitation is one with one Gap-provided transmitter of the aforementioned type used to record in a standardized digital Format such as the format labeled NRZ (mark), NRZ (reverse), RZ and the like », where NRZ corresponds to a return to the zero position and RZ corresponds to a return to the zero position. The single ones Movement stages of the recording medium become equal to or less than the length of a recorded one Bits selected for the NRZ format. This has the consequence that also with an impulse recording at Stilüand continuous NRZ pattern is obtained.

According to the invention, the bandwidth is chosen to be so small that that a suitable signal can be generated without it this requires a high tape speed or a large number of turns on the playback reel.

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The invention is explained in more detail based on the drawings. In it, shows »

Fic · 1 In a schematic, partially perspective illustration, a data processing system which has a inventive Macnet head arrangement used.

Fig. 2 shows the Macnet head arrangement according to Fig. 1 in enlarged perspective view from which the ^ arrangement of the Macnet head and a magnetic recording mediums are visible to one another;

FIG. 3 shows part of the magnetic head assembly according to FIG. 2 in enlarged scale.

FIG. K shows a part of the recording medium on an enlarged scale with the idealized depicted recorded pattern.

Fig. 5 is a graph showing operational data of the system.

The system according to Flg. 1 shows in its most general form a diettales, gradual working as well as modern data-processing systems used recording device 10 with the verification serving for the Sehalteinrichtung. A particularly versatile and beneficial · kind of one staged system is described in U.S. Pat.

3 * 185.36% described «, with a magnetic bath 12 in one 90 984 4/1372

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the belt tension compensating arrangement with a relatively large wrap angle and the drive roller lh , and is directly driven by a motor 16 coupled to the drive roller, which has a high torque compared to its moment of inertia. The current excitation of the motor 16 during the transient and steady operation mode is changed to control the acceleration, deceleration and smooth running of the motor 16, and therefore these | Excitation at any point in time depends on the speed of the magnetic tape 12. This system has considerable advantages because it is inexpensive, allows easy handling of the magnetic tape and can be used for several types of processes, namely for intermittent operation in both directions, as is used in particular for a digital data processing system, and asynchronous, step-by-step Operation as it is done with the step-by-step recording. Although magnetic tape transport is described, other types of magnetic media, such as cards, tapes and foils, can also be used.

The tape 12 is unwound from a supply reel 18, guided around the individual drive roller 1 * + and wound onto a take-up reel 20, with separate vacuum chambers 22, 23 being arranged ^{between the drive roller I 1 * and each of the two reels.} A magnetic head assembly 25 is standing

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with the magnetizable side (oxide side of the strip 13) in operative connection »The servomechanisms not shown in the drawing for the coils 18, 20 work depending on the loop lengths in the vacuum chambers 22» 23 », which are scanned by scanning devices, also not shown and are operated in the usual manner so that the loop length are kept in certain positions or between certain limits when the belt 12 is driven by the drive roller λ 14. Since the present embodiment deals only with the step-by-step recording and verification of the recording, a detailed description of the tape transport 10 is unnecessary.

With asynchronous recording, the buffer system can be removed or largely simplified and there is no need to operate in both directions. Furthermore, the same or an additional magnetic head arrangement can have read, write and erase transmitters, which, however, are not shown for the sake of simplicity. The \ magnetic head assembly 25 shown caused fed together with the further below described devices and operations of the digital recording and immediate verification ", the recorded data are taken from a data source 27 and over AifZeichnungsverstärker 28 the magnetic head 25th Normally, as to a certain time, a mark Date fed in in series as characters and in parallel in bit form. These data characters can be of the usual binary form, ie, for example

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an impulse or, nio) itiiipulskpmbination _: represent or as so-called. RZ signals (return to zero position) can be formed with pulses of opposite polarity and are recorded as such. Preferably, however, in the so-called. NRZ procedure (no return, to the zero position) such as. For example, recorded in the NRZ (trademark) or NRZ (Weehsel) code, the data source having conventional fichaltkreise not shown in the drawing, which are used to generate suitable signal changes. . The NRZ mark system, also referred to as the NRZ- * 1 system, uses a polarity switch for each binary digit "1". In operation, there can be a significant delay between successive characters. However, maximums are desirable. Strings of 300 to 700 characters per second: where at a bit density of 200, 556 or 80Q bits per 2.5 ¹ + cm. Should be recorded.

The step or; gradual transport of the magnetic tape Serving step mechanism can be with an electromechanical Element «with a magnetic or electrostatic Coupling or be equipped with a stepping motor that has a magnetic trigger. Preferably, however, the step mechanism is with a electronically controlled system, as described in US Patent 3,185.36 ^, its use in conjunction with a reference device 30 takes place, which has exact gradations that are so from each other are separated, that the for a certain recording

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dense desired steps.

According to FIG. 1, the reference device 30 can have a disk 32 fastened to the shaft of the drive roller Ik and serving as an optical reference element, which has a grid 3k * 35x36 on radially offset circular rings formed by spokes or other elements, which have a different grid Have light transmittance g or a different reflectivity * The movement of these spokes or the like is scanned by an optical scanning system when the disk 32 rotates with the drive roller Ik. On one side of the pane 32 there is a light source whose light beam is focused by an optical system 39 and directed onto a photoemepulsive element, such as a cell kO , arranged on the other side of the pane. In order to achieve variations of light, ie in particular to achieve amendments (the light intensity conclusions even with relatively small movements of the disc 32, the various Fokuesier- and modulation devices can be used, such as optical pulse systems · a Interferrenz causing disc which is arranged so that a moiré effect is achieved, and light slit arrangements. For the sake of simplicity, these systems have not been illustrated and explained in more detail. The signals generated by the photo-sensitive device ko are forwarded to a

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more strongly supplied to h2 , which can have a threshold value or zero detector which responds to a certain deviation in the signal. A pulse, which indicates the passage of a single step on the reference disc, is then created by a coupled pulse generator ** 3. The pulses generated in this way are called so-called. Stop signals are supplied to circuits k $ - which are coupled to a drive motor 16 and initiate the deceleration of the movement of the drive roller and thus of the magnetic tape. The circuits -k $ can be formed in the manner described in the aforementioned patent. The data characters taken from the data source 27 trigger the start commands * The presence of one or more parallel pulses corresponding to a character is displayed for this purpose in an »OR circuit kj . Before it is fed into the exciter circuits * + 5 of the drive motor 16, the start command is first fed to a pulse generator and amplifier * + 8. A delay device, not shown in the drawing, can be inserted in order to ensure that the step-by-step switching is triggered after the writing and that higher step sizes are obtained. This allows residual oscillations of a previous writing process to fade away during the delay period. As explained in more detail below, the magnetic head assembly 25 has write and read circuits to avoid switching and to simplify the arrangement. These

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Circles can of course be combined, whereby for the separate coupling of the reproduction and recording circuits during the corresponding operating sequences with the magnetic head arrangement 25 circuits can be used. An example of a method for recording explained is the NRZ (change) method, the binary digit "1" being characterized by a recorded level of positive polarity (in this exemplary embodiment) and the binary digit "0" by a corresponding level of opposite polarity or direction of magnetization are. For a particular character or recording field, each recording track has a parallel binary digital position or data cell. If a sequence of binary digits "1" or "0" is recorded, the same recorded patterns are selected for a sequence of data cells.

The following stage which is opposite to the first Binary value indicates is without a return to a state the magnetization "0" with oppositely directed magnetization. The tape Dder another recording element can be used to create a magnetization of a certain direction vormagnetlslert be, whereby only the magnetization opposite to this has to be used. How to known to the person skilled in the art, the NrZ methods have opposite the earlier methods of pulse recording.

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the return from the premagnetized state or the Returning to the "0" record, a significantly increased information density and a significantly improved signal to the noise ratio. In a single data cell or a sequence of data cells that make up a Correspond to binary value, all magnetic particles of the magnetic medium are, as it is through this sequence is detected, magnetized in a certain direction (see Fig. ■ +).

For the purpose of verification, the replay windings of the magnetic head arrangement 25 are coupled via conventional replay preamplifiers 50 and pulse generators 51, with the data signals read out being fed into a character register 53. The characters of the data source 27 are also ^{fed step by step into a character register 5 1} +, which has the same number of bit positions. The two registers 53 * 5 ^ are each connected to the separate inputs of a comparator 56 for several bits. If any disparity occurs between the binary digits being compared, the comparator 56 generates an error signal. This error signal can be used to trigger a correction process or the like. A reset signal *, for example the stop signal of the pulse generator kk _% , is applied to registers 53 «5 ¹ + after each comparison. The error display can also be fed to an external error correction device. The coupled to the data source 27 in the

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Drawing not shown intermediate circuits
can be designed in such a way that the recording of a new character is interrupted until a corresponding error display or correction has been made. The tape transport system 10 shown records during the tape standstill and verifies the recording during
of the subsequent intervals wich the steps. The present embodiment is only concerned
with a write-in and verification feature of the magnetic head assembly 25 and the system according to the invention.

After receiving a desired set of in asynchronous Data recorded in the manner recorded on the magnetic tape 12 may be continuous or intermittent in blocks or on be played back a separate tape transport by means of conventional transmitters and control devices.

The operation of the system according to the invention is as follows: During the recording, each individual
Data characters of the data source 27 passed through the recording amplifier 28, after which this character excites the magnetic heads arranged separately in the multi-channel transmitter * or magnetic head arrangement 25 in a corresponding binary code. At the same time comes the sign
which has several bits, for the purpose of the subsequent verification in the register 5 ^ · By feeding the start pulse into the exciter chaltkr ei se 1 + 5 excites the

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The signal to be recorded is also the stepping system * The magnetic tape 12 "is transported by an amount which is approximately equal to or less than the length of the drawn pattern, which is determined by the gap width of the individual pick-ups.

In the present embodiment the channels are mutually exclusive same. The magnetic head arrangement has several identical transfer elements which are identical to one another and to one another

parallel gap widths. However, this symmetry is not required for all applications. the Reference device 30 controls the length of the individual Step tew * of the scornful level, depending on a pulse is generated by the passage of an individual gradation in one of the rasters 3 * t, 35.36 of the disk 32. The stop signal immediately stops the tape transport within a fraction of a millisecond. At the start of the step or step movement, the leading and trailing edges remain (this definition is chosen with reference to Figs. 2 and 3) of the magnetic head gap in a channel within the magnetic field, the previously magnetized data line. The magnetic river penetrates into the magnetic core of the transfer head a and induced in the with the playback circuits " coupled playback winding a signal that corresponds to the amount of change in magnetic flux * The read-out signal shows a significant deviation when the gradient of the

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Magnetic flux in the area of the trailing edge of the pulse in enters the gap. With this deviation, the data pulses in the playback preamplifiers and in the Pulse generator circuits regenerated.

The data pulses are then fed into the reproduction register 53, which is also coupled to the comparator 56. Before the next character occurs, the characters are immediately verified by the absence of an error display by the comparator 56. For a better understanding of the relationship between the transmitter gap and the step spacing as well as the length of a recorded data cell, reference is made to Figs. -2 »3 and k . Like the Ffe. 2 shows "which represents an individual channel in an enlarged and simplified manner", the gap of the magnetic head 60 is marked by an inserted, non-magnetic spacer 61 * during the transport of the magnetic tape 12 in the one shown in FIG

Direction of the arrow can one pole face 63 as so-called. |

Back flank pole face and the other pole face 6k as so-called. Front flank pole surface can be considered. The gap width is approximately equal to or greater than the bit length. The amount of tape length by which the tape 12 is transported corresponds to the bit length. The entire length of the tape 12 between the poles 63 and 6k is magnetized in a certain direction which corresponds to the desired binary value of this number.

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There is a slight edge effect underneath the transducer head gap. The magnetic core formed by the magnetic head 60 has separate recording and reproducing coils 67.68. After completion of a step-by-step transport of the tape, the cell located under the magnetic head either adjoins the immediately preceding data cell or slightly overlaps it. The dipoles formed by the magnetic oxide particles of the tape 12 are rectified in both data cells when the same binary digit is recorded in both cells in this format. If different digits are to be recorded in this code, the data cells have a different direction of magnetization with a relatively sharp transition in the border area of the transition line between the two neighboring cells. Given a sequence of binary digits of the same value) there is therefore a continuous length of the recording medium in which the magnetic particles are oriented in the direction idealized in FIG. K. In practice, the distribution of the magnetic flux corresponds to a normally rectangular waveform in which the respective direction of magnetization is continuously maintained until a transition point is reached. As a result, this corresponds perfectly to the usual NRZ (alternating) recording. In the present embodiment, the recording signal is temporally discontinuous, with the recording element 12 also dis-

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is moved continuously. In contrast to this, the read head is part of the previously known NRZ systems the continuous movement of the recording medium continuously with a saturation value of the magnetization aroused · Through the use of pulse recording is the proportion of the required performance is reduced, although the transducer gap compared to the recorded Bits is wide and therefore encompasses or overlaps a single recorded data cell and the tape is g

Moved at low speed, a playback signal sufficient for verification is still generated. The tape transport of the aforementioned type is to momentarily speeds of about 5 or 7 »5 cm per second during a step or reach a stage" In this case, an appropriate reproduction power erzeugfc _a fiückkante when the entering of the recorded pattern in the gap. The pole tips 6 ^ f of the transfer head remain in the recorded magnetic flux pattern. As is known per se, "the magnetic resistance of the gap increases with the \

Gap dimensions too. In addition, it is known that a limited belt speed by a small one

d step-wise movement is achievable. Act * therefore the Gap dimension related to the length of a step and to the information density, so is with the usual pick-up arrangements and steps. switching systems an information density of 50 bits per 2.5 ** cm and a width of 1/50 inch is possible. At a

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There is no significant exceeding of these values the use of special transducer head and coil arrangements difficult, suitable for playback To receive signals as well as a corresponding signal to noise ratio

According to FIG. 5 ″, only a very short pulse recording is required for a given sequence of binary digits (see curve form A) (see curve form B). At w Use of the transfer head arrangement and the recording system according to the invention is denoted by ait C. Obtain a curve shape that represents the desired NRZ magnetic flux distribution in the recorded patterns. During the verification, the belt is accelerated from a standstill to a maximum speed according to curve D and then again to a standstill delayed. The amount of change in magnetic flux that is directly proportional to the induced signal (curve E) changes to some extent with the belt speed. However, the main part of the discrepancy is due to the Magnetic flux gradients at the rear of the pulse pattern. The signal fluctuates between one Value from approximately zero to a positive or negative peak and back. It can be observed that the magnetization of the induced signal is directed in the opposite direction to the recorded signal. Because the gradient of the magnetic flux in the rear area

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receives a positive value in the case of negative magnetizations and vice versa. Smaller but still distinguishable peaks can be determined by a corresponding threshold value or time-determining circuits are suppressed. The maximum peak occurring is determined by peak detector circuitry displayed, with the subsequently generated data pulse in the manner described above for comparison and serves for verification. For common data transfer purposes at high continuous speeds a playback transducer head with a large gap width is less suitable than a playback transducer head with a small gap width. A gap of great width can namely more than a data cell encompass »resulting in an ambiguous Reading leads. It is therefore advisable to use a standard playback transducer head arrangement for high-speed playback to use »to get a better signal to noise ratio and a sharper one To ensure the imprinting of the impulses read out. That The signal read out with a transformer of the usual narrow gap width has peaks at the transition points aufk and represents a normal read-out NRZ signal reproduced by the curve F "How-out of the curve can be seen, occur due to the non-rectangular shape the recorded sequence as well as the gap width and other operations a few minor points and one Signal rounding up. As above; mentioned, can the magnetic tape 12 is pre-magnetized in a certain direction

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be netized »so that recorded patterns are in opposite directions Magnetisierungseinriehtung a magnetization of the tape cause * per the rear area of such a pattern »which the magnetization of the recorded pattern of separates the premagnetization of opposite directions of magnetization, comes into the effective range of the magnetic head transmitter arrangement 25β when the magnetic tape 12 by one step is transported further and generated in the playback · » winding 68 of the magnetic head assembly 25 a signal · recorded Pattern of the same direction of magnetization such as that of the tape bias do not generate any in the tape magnetization Change, which is why no significant signal is indicated when the magnetic tape is transported in the playback winding 68 "I'm in the playback winding 68 existing signal verifies the recording of a Pattern with opposite directions to the band magnetization Direction of magnetization and can be used to verify the Compare the recording with the data input signal. In this embodiment of the invention, when a magnetization lock is recorded, the magnetization direction is the same as the tape bias no further verification required. The saturation » bias creates a relatively simple system, since the transducer is controlled by an encoding Flip-flop can be driven, the state of which can also be used as a reference value for the comparison. Certain Advantages can also be achieved when using a pick-up a gap width that is slightly larger is used,

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than the desired flowers. The in the direction of tape movement rear edge of a data cell remains unchanged after the removal from the gap area. He the front edge of the data cell in the direction of tape movement comes after the step or step belt movement into the gap area. Hence the in the foregoing Welse always defined the front edge of the gap as the transition point and the length of the previous recording " which is modified. This relationship allows it. the. Influence of the changes to overager gap tolerances to neglect. Based on the same relationship between the gap dimensions of the transducer head and the bit spacing can produce similar results if the belt is operated continuously with recorded at low speed or a very or sequence of steps is used «in which the tape is used before the Record is brought to its speed. In the latter operating mode, the transport is with only one drive roller is preferred, since only a fraction of the time interval required to perform the stepping movement is required for acceleration and deceleration. During the major part of this temporal intervention, the tape is with transported at a constant speed. When using this arrangement, the overhead gap can be slightly larger be more careful than what is described above to ensure the overlap of successive data cells. ,.: ... · ■;, ..

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Claims (1)

- 2k - · 1498592 Patent claims: 1. Magnetic head for recording and verification of the digital patterns recorded on a magnetic tape, characterized in that the magnetic head (60) has a a magnetic tape (12) which is operatively connected, not * magnetic gap (6l), the width of which is at least corresponds to the desired length of stepwise recorded information and that the magnetic head with a Recording and playback reel (6 / or 68) is coupled. 2. Magnetic head according to claim 1, characterized in that that the width of the non-magnetic gap (6l) is greater than the desired length of a step or a level recorded. 3. Magnetic head for the step-by-step or step-by-step recording of digital patterns of a given information density " according to claim 1, characterized in that the length of the non-magnetic gap (6l) - viewed in the direction of tape transport - is equal to or greater than the layman one single digital pattern. k » Magnetic head for recording digital patterns on a magnetic element, the information density of the pattern - viewed in the longitudinal direction of the magnetic element - η bit per 2: .5? 909844/1372. ₂ 5- BATH ORIGINAL previous claims, characterized »that the Gap width - viewed in the longitudinal direction of the magnetic Elements (12) - at least one by η of the information * density is. 5 magnetic head for recording digital patterns, on a magnetic element, the information density of the pattern - viewed in the longitudinal direction of the magnetic Elements - is more than 50 bits per 2.5 ** cm, after one of the preceding claims, characterized in that the magnetic head has a highly permeable magnetic core facing each other and adjacent to the magnetic tape (12) pole tips (63.6%) that'der magnetic head with a non-magnetic gap (61) is provided, which is located between the Polsp * «strands and has a gap width which is equal to or greater than the reciprocal value of the information density and that the magnetic head with recording and playback reel (67) or * (68) is coupled. . ■■ - "■■■ ^'■:: ■ ■■■ "Y magnetic head for step-by-step or step-by-step recording of digital patterns, given length in the NRZ process onto a magnetic tape, characterized in that the magnetic head (60) has a gap (6l) the width of which - viewed in the direction of tape movement - is equal to or greater than the length of the digital pattern - 26 9098U / 1372 ~ ' 7 · Magnetic transmission system for NRZ recording of digital data in individual cells during successive periods of time which do not fall short of a certain period Time intervals, characterized in that a magnetic head designed as a magnetic core is provided, which has pole tips (63.6W) whose distance from one another is the same or lattice is as the length of data line that between the Pole tips a gap-forming non-magnetic spacer (61) is arranged that during a relative short portion of a certain period of time to generate a magnetic flux of a certain direction of magnetization for a certain binary digital value a device is coupled to the magnetic head (60), and that for scanning the magnetic flux changes during the remaining portion this period of time another device with the magnetic head is coupled. 8 «Magnetic transfer system according to claim 7« marked in that the magnetic element (12) - -.- ■■■■ - ■ pre-magnetized in a certain direction before recording and that the scanning of the magnetic flux changes Serving facility only on magnetic flux changes responds, which are directed opposite to the bias direction. 9. Magnetic transfer system according to claim 7 characterized in that the magnetic element (12) is continuously transportable. BATH ORIGINAL 9098U / 1372 -27- U99592 10. Mafinetic transfer system to the immediate Reading out the recorded on a magnetic storage element digital data «characterized · that one for transporting the magnetic storage element (12) in certain identical steps or. Level serving facility (10) it is provided that a magnetic head (60) is provided, which is in operative connection with this storage element stands that the magnetic head (60) has a write and read coil (67) or (68) «that the magnetic head a device (6l) having a non-magnetic Forms gap, the length of which is gJSBer than a step or Stufelnänge «that to * excite the writing coil Recording of a pattern while the magnetic storage element a device is provided, and that for scanning a previously recorded Pattern «during the subsequent gradual transport of the magnetic storage element takes place, a device is coupled to the reading coil. 11 * Magnetic barrier system according to one of the preceding Claims, characterized in that the magnetic head (60) is used to generate a recording Magnetic flux in the magnetic head is coupled to a device, the operation of which is related to the time of transport of the memory element (12) and with adaptation to the length of the non-magnetic gap (61) of the magnetic head it. takes place so that in accordance with the binary, digital values of the magnetic storage element (12) 909844/1372 the intermittent magnetization of the magnetic head leads to essentially continuous magnetization in one or the other direction of magnetization and that for scanning the element in the magnetic memory previously recorded magnetic flux pattern a device is coupled to the magnetic head in the intervals between the generation of the magnetic flux in Activity occurs, "12. Magnetic transmission system according to claim 11" characterized * that the magnetic storage element (12) premagnetized in a certain direction of magnetization is and that the device is intermittent Generation of a magnetic flux in the magnetic head (60) only changes the recording pattern in opposite directions Magnetfeierungsrichtung causes. 13 · Magnetic recording system for verification of the recording of the digital data recorded in the NRZ process "immediately after recording on a magnetic tape, the magnetic tape being transported asynchronously in certain essentially identical steps to generate a certain bit density" characterized "by a magnetic head ( is provided 6θ), (having 63.6 ¹ O, with the magnetic tape (12) of the pole tips are in operative connection "that the magnetic head has a write and read coil (67 or 68) and serving as a non-magnetic gap and disposed between the pole tips 9098U / -1372 - 29 - BATH Has element (6l) that with the facing End faces of the magnetic head coincide »that the Length of the non-magnetic gap at least equal The specific step length is that a device for exciting the writing coil (67) is provided so that a magnetic flux of a specific direction of magnetization is generated in the magnetic head, that this device is currently in operation only for a fraction of what is required to transport the magnetic tape over an entire step is »that this device comes into operation in relation to the position of the previously recorded pattern and that during the remainder of the transport of the magnetic head relative to the magnetic tape for scanning the currents induced in the playback reel 68 by the immediately preceding recorded pattern, a device is coupled to the playback reel. 1 ^. Magnetic recording system according to claim 13, characterized in that a comparison system is additionally provided which has a first memory device i5k) »which serves to record the signals that are to be recorded» and that has a second memory device (52) in which the actually recorded and scanned files are fed in, these storage devices being coupled to a comparator to display a discrepancy between the data *