DE1069908B - - Google Patents

Description

GERMAN

Method and device

to check the correct reproduction

of data

The invention relates to methods and devices for producing a data recording in such a system Form that the correctness of the reproduction of the recorded data can be reliably checked. The invention relates in particular to a method for checking the correct reproduction of these Data.

It is known to provide information e.g. B. on a magnetic tape or a punch card or a Record perforated tape in such a way that the correctness of the information can be checked. With such a Arrangement is z. B. each captured character is encrypted so that it is separated by an odd number is represented by code elements. Upon sensing these captured characters, the number of code elements becomes counted each character to see if the

Number is odd or even. If the number is even.

then this indicates that there was an error in recording _

drawing or sensing of this mark is available. "

It is clear that this test arrangement is generated at an increment, which one of the counter controlled

Applicant:

Dr. Gerhard Dirks, Frankfurt / M., Mörfeider Landstrasse 44

Claimed priority: Great Britain August 6, 1957

Dr. Gerhard 'Dirks, Frankfurt / M., Has been named as the inventor

Increasing or reducing the code elements of a character by two or a multiple thereof is not an error indicates.

It is an object of the invention to provide a method for th gate circuit to be supplied by the To check the count recorded by the counter.

The device for recording the pulses that are suitable for the test method can, for. B. two gate

Check the correct reproduction of data to have 25 connections, each with a record

which are represented by signals recorded on a recording medium and which are in a Channel in one form and in a second channel in another form are recorded, using voltage magnetic head are connected and which clock pulses are fed from a pulse generator. the Data input pulses are fed to a bistable arrangement, which after the occurrence of the input

iniies converter for the two channels to generate 30 output signals is switched, with the gate circuits be controlled by the bistable arrangement so that the gate circuit is effective when the arrangement is in one state and the other gate circuit is effective when the

of electrical signal sequences.

According to the invention, the individual components or bits of the signals are in the. both channels inversely and the numerical values of the overall representation ei

Data entry is complementary to each other in the 35 bistable arrangement in the other state.

recorded on both channels; In a comparator, the electrical signal sequences generate error signals generated, which indicate whether signals occur at corresponding points in the two channels.

The source of the clock pulses can be connected to the two gate circuits via another, from a counter controlled gate circuit are in connection, the counter is actuated by the clock pulses and

In the method, counting devices can control the supply of predetermined clock pulses

are used, which count the electrical signals corresponding to the two data devices, to generate an error signal when the count of a data device has reached a certain value deviates.

It is advisable to use the complementary data setup in binary code or in a binary encrypted one Make decimal code. The two combined signal sequences of the channels can together form a clock pulse sequence result.

In order to separate the successive data entries, group marking signals can be assigned to the data entries and, when these group marking signals are sensed, electrical signals grounding the two gate circuits can be prevented in order to cause regularly recurring interruptions in the recording. · ^:

The clock pulses can operate another counter, the group marking signals for the recording generated.

The following are exemplary embodiments of the subject matter of the invention explained in more detail in connection with the drawing:

Fig. 1 shows a tape serving as an information carrier;

Fig. 2 shows the circuit of an arrangement zun Recording information on a: magnetic tape;

909 650/246

3 4

Fig. 3 shows a schematic circuit diagram of an end-of-group signal can also be replaced by a larger one

Order for sensing and checking information space can be formed, so that then only two

functions that are on a magnetic tape; Traces are required.

Fig. 4 shows the circuit diagram of an arrangement for FIG. 2 shows a circuit diagram for generating a ma

Processing of information contained in serial magnetic tape recording according to Fig. 1. An im-

allele arrangement are present. pulse train, which contains the information to be recorded

Fig. 1 shows part of a magnetic band is represented by a pulse source 46 via a

des 1, on which the recorded signals 2, 3 and 4 are fed to line 9 of a flip-flop circuit 10,

are indicated schematically by black areas. This pulse train consists of one pulse for each

The signals 2, 3 and 4 are in separate tracks i ° code, which are necessary to represent the information. or channels 5, 6 and 7 arranged. In every area there is. For example, the number "7" would be divided into three inches of the tape, represented by two dash-dotted pulses, which one after the other are the codes Lines 8 is limited, a decimal digit is added - "1", "2" and "4" represent, followed by a free space draws. The value of each recorded digit is followed, which corresponds to the code "8"; another by the signals 2 in the track 5 after a binary * 5 free position corresponds to the space between be-decimal code recorded the one below the lower adjacent digits. The two anode circles of the flip edge of the tape is denoted by numerals. The flop circuit 10 control gate circuits 11 and 12, Test signals 3 of track 6 are in those code digits whose output signals are magnetic recording present that are not in the track 5 heads through signals 13 and 14 are supplied. The heads 13 are occupied. The right digit in Fig. 1 gives the 20 and 14 draw the signals in tracks 5 and 6, respectively Value »7« again by transferring the signals 2 to the code of the band 1.

place »1«, »2« and »4«. The track 6 contains the input line 9 is with one grid of the

therefore a signal 3 only in the code position »8«. Connected in flip-flop circuit 10 so that a pulse

Similarly, the next digit "4" means that the flip-flop circuit toggles on this line.

the. Signals 3 at positions »1«, »2« and »8« of the 25 tet. When the flip-flop circuit 10 switched

Track 6 are recorded. The test track 6 contains, the anode voltages are dimensioned in such a way

here the inverse form of the recorded in the data track 5 that the gate circuit 11 is open and the gate circuit

drew digits. device 12 is closed. The entrances of the gate

Since all codes that are not connected to a signal 2 lines 11 and 12 are clock pulses from a source are occupied, contain a signal 3, the sum of the 30 47 via a line 15 and a gate circuit 16 is zuSignale in the two lanes 5 and 6 for each digit. These clock pulses are with the input surface always equal to 4. If such a recording pulses on the line 9 synchronized, and the is sensed and the sensed signals from at-gate circuit 16 is used to every fifth Imden Lanes 5 and 6 are counted, forming the entire pulse to suppress the gap between adjacent counting produce either for each individual digit or for 35 bart digit records, a group of digits an indication of whether ir- If the gate circuit 11 on the occurrence of any Signals during the recording or when the pulses on the line 9 is opened, it leaves one Sensing have failed. By also the same clock pulse from the gate circuit 16 through; the button early occurrence of signals in tracks 5 and 6 13 is excited so that there is a signal on track 5 is checked, it is ensured that no interfering 40 is recording. The same clock pulse goes through a the signals have been recorded or sensed. Delay stage 17 leading to the second grid of the The correctness of the information when sensing a flip-flop circuit 10 leads to it being switched off, such record can thus be easily checked. immediately after the signal on tape 1 on-Die combined signals of tracks 5 and 6 can be drawn, and so the flip-flop circuit can also be used to generate a clock pulse train 45 for actuation by the next input for To deliver tax purposes. to prepare an impulse on line 9. If not . The information can also occur in a different encrypted pulse on line 9, the next ter form, e.g. B. corresponds in an "excess 3" code for decimal code position, then the flip-flop-scarf digits or in a seven element code for device 10 turned off when the next clock pulse alphabetical. Letters and digits, recorded 50 occurs. The gate circuit 11 is closed and the be. It can also be used uncombined codes gate circuit 12 open, so that the clock pulse from the will. For example, a decimal digit can be fed to head 14 through gate circuit 16 to a a signal can be shown in track 2 to be recorded on the signal in track 6. In this way that place out of ten possible places is which becomes a signal on tape 1 at each clock pulse corresponds to the desired digit value while recording Si-55 passing through the gate circuit 16, and Signals in the remaining nine positions in track 6 are recorded in track 5, if a corresponding one is drawn in will. Therefore, the number "7" is present in a transmission pulse in the line 9, and in The digit area of the tape would be recorded on track 6 if no such pulse was present Signal in track 5 is recorded at the seventh position.

net, while in track 6 signals at the first to 60. The pulses from the gate circuit 16 are also sixth and eighth to tenth digits recorded in a chain of three flip-flop circuits 18, 19 and net would. 20 are supplied, which together form a five-digit counter in order to process information signals. The impulses are the two grids of the To simplify matters that are sensed by the tape, flip-flop circuit 18 is fed to them to be alternated to switch over the signals of each unit of area and each digit. Every time the flip flop surface of which an adjacent area is switched off by circuit 18, it gives a pulse separated a distance equal to the recording of a to the flip-flop circuit 19 from. Every time that Code corresponds. In addition, if each Zif flip-flop circuit 19 is switched off, it gives Ferngruppe a signal 4 in the track 7, which as a Mar pulse to the flip-flop circuit 20 from. in the kierungssignal is used for the end of a group. The 7 ° initial state are all the flip-flop circuits

turned off, so that after four pulses have passed through the gate circuit 15, the flip-flop circuits 18 and 19 are switched off and the flip-flop circuit 20 is switched on. An anode of the flip-flop circuit 20 is connected to the gate circuit 16 and keeps it open as long as the flip-flop circuit is switched off. The other anode of the flip-flop circuit controls a gate circuit 21 to it to open when the flip-flop circuit is on. The fifth clock pulse is therefore from the Gate circuit 16 is not allowed through, but by gate circuit 21 and becomes a grid of the flip-flop circuit 20 supplied to turn it off. Since the counting flip-flops are now in their initial state are returned, they are ready for a new work cycle. There's one on the tape There was a gap after the last digit recording, as the tape was moving at a uniform speed passed the recording heads and none of the heads was energized during a cycle. The impulses from the gate circuit 16 are also fed to a counter 22 which has a counting capacity that is equal to four times the number of digits in a group. If z. B. ten digits belong to a number, then the counter has the capacity forty and generates a transmission pulse at the end of each Group of ten digits. This pulse is sent through a delay circuit 23 to a recording head 24 to record an end marker signal in track 7. The marker signal which indicating the end of the group can also be obtained from the computing device or from another device which generates the input signals and the clock pulses.

The information can also be recorded in other ways. The signals of the gate circuit 11 and 12 can e.g. B. be used to control magnets which press punch, so that a perforated Paper strips or a punch card is generated with the holes in two rows accordingly the tracks 5 and 6 of the magnetic tape are arranged. The signals can also be used by a device Control the printing of markings on the recording medium. The markings can be with a magnetic or an electrically conductive ink or with ordinary printing ink for photoelectric sensing. The records can be created by hand, by placing visual signs in the places where the markings are to be effected. By using an appropriate number of recording devices, the signals for all codes of one digit or of several digits can be recorded at the same time. if the information on a sheet e.g. B. a card or a check is attached, need the tracks or channels not being recorded close together. However, a narrow spacing of the tracks allows a certain skew of the tape during sensing without errors occurring.

The information recorded by the heads 13 and 14 can be read by reading heads 25 and 26, which are connected to a test circuit 48 are connected to be tested. The heads 25 and 26 are spaced a short distance apart from heads 13 and 14 so that the information is scanned a short time after recording, while the tape continues. The details of the test circuit 48 are shown in FIG. The traces 5 and 6 are sensed by heads 25 and 26 which amplifiers 27 and 28 feed. The amplifiers 27 and 28 feed amplifiers 29 and 30, the outputs of which are connected together to a clock pulse line 45. A pulse occurs on line 45 each code position of the scanned digits, as each code position is recorded either in track 5 or the track 6 contains, so that the clock pulse train can be used to a computing device or synchronize another device to which the information sensed from the tape is applied;

ίο The information signals sensed from track 5 are also connected to a grid of a flip-flop circuit 31 via the amplifier 27. fed. Every time when an information pulse occurs, the flip-flop circuit is activated 31 switched on. A gate circuit 32 is from the voltage at one anode of the Flip-flop circuit 31 controlled so that the gate circuit is only open when the flip-flop circuit is switched on is. The gate circuit 32 also receives the clock pulse train from the amplifiers 29 and 30 is supplied so that every time the flip-flop circuit 31 is turned on, a pulse appears the line 33 is generated by the gate circuit 32. The pulses on line 33 are the The input of a shift register 49 is supplied to which the clock pulses on line 45 are supplied as shift pulses will. The output pulses are transmitted via a delay circuit 34 to the other grid of the Flip-flop circuit 31 is supplied to turn it off, so that the flip-flop circuit after each output pulse switched back and activated by the next information pulse from the amplifier 27 ago is ready. The information pulses are also fed to the input of a gate circuit 25, which is controlled by the test signal pulses of the amplifier 28. Therefore, if there is an interfering signal on a of the two tracks 5 or 6 has been recorded, so that from the amplifiers 27 and 28 pulses at the same time are generated, then the gate circuit 35 is actuated and generates an output pulse on a Error line 36 so that an error indicator 50 is actuated.

The clock pulse train of the amplifiers 29 and 30 is also fed to a counter 37. The counter 37 becomes used to control a gate circuit 38 via a line 51, the gate circuit 38 being open, unless the counter registers the correct number for a group of digits. Group marker signals are fed to the input of the gate circuit 38 through a head 39, which the track 7 over an amplifier 40 senses. The gate circuit 38 therefore generates an output pulse which the Error line 36 is supplied if not the correct one when a group marker signal occurs Number of pulses from the counter 37 has been counted. The absence of an impulse on the line 36 while sensing a group of digits on tape 1 indicates that the correct number of Signals in tracks 5 and 6 has been sensed and that not two signals are in the at the same time Lanes 5 and 6 have been sensed. The operation ■ of the error indicator 50 can be used to to stop the belt drive or to feed the belt for a distance equal to a group of digits is to be reversed so that the group is sensed a second time. An indicator light or another warning device can be actuated when an error signal occurs. Also can the position of the counter 37 can be checked during each digit gap. This is desirable, though a group digit by digit and not as a whole

a printing device is transferred. It is convenient to count on the same basis for the Groups or group sections to be checked as for the transmission.

The counter 37 is reset to zero at the end of each group of digits by the group marking pulse fed from the amplifier 40 to the counter via a delay circuit 41 will. The group marker pulse is also fed to a counter 42. The one determined by the counter Value indicated by the potential of an output line 43 of the counter provides an indication what group of digits is being sensed; the potential of these lines can be selective Control transmission of a desired group or groups of digits from the tape. Output lines 44 from the counter 37 can be used to selectively transmit certain Control digits of a group in the same way.

The sensing heads 25, 26 and 29 can be replaced by other converters, e.g. B. photoelectric cells, electrical Sensing brushes or other sensing devices, are replaced when the circuit is used to to sense information that is applied in the form of markings, holes, etc.

The counters 22, 37 and 42 may be decimal counters of known form which are a chain of flip-flop circuits contain. A suitable form of the counter is e.g. B. British Patent 672,321 described. Each of the counters 22, 37 and 43 consists of two decades units.

The delay circuit 23 is capacitive with an anode of the third counter stage of the second decade of the counter 22 coupled so that the pulse is fed to the delay circuit when this Level is switched on; this occurs when the counter reaches 40.

The potential of line 51 is determined by a diode "and" gate circuit certainly. The "and" gate circuit has an input connected to the anodes of the stages of the first decade of the counter is, and an anode connected to a third stage anode of the second decade, so that the Voltage at the output of the "And" gate circuit only drops after the first decade is zero and the second Has reached decade four. The output of the “And” gate circuit is connected to line 51.

The flip-flop circuits 31, 18 and 10 have the usual circuit structure as that in the counters. The gate circuits 11 and 12 can consist of pentodes, in which the control and braking grid serve as an entrance. A pulse transformer can be provided in the anode circuit to reverse the polarity to be able to select the output pulses.

It should be noted that the filling device of FIG. 3 can be used to fill any belts to sense which records of the kind described are being carried and that it is not necessary to put them together to be used with a recording arrangement according to FIG.

Fig. 4 shows how the arrangement of Fig. 3 can be modified to allow serial parallel recording of values on a magnetic storage drum 53 to be processed. The digits are standard recorded as in the tape of Fig. 1, but the code elements of one digit become parallel recorded along the same axial line. A double track is therefore provided for each code element. The digit signals are on tracks 54 to 57 and the test signals on tracks 54c to 57c recorded. The numerical value "7" is therefore represented by signals in tracks 54, 55, 56 and 57c all lie along the same axial line. The circuit of FIG. 3 can be used for each double track can be used, the capacity of the memory 37 being reduced to take into account the fact that only a single signal is generated for each digit. The arrangement of FIG. 4 brings one

ίο considerable savings in terms of the amount spent Switching means with itself.

The heads 59, which work together with the double tracks, each feed a unit 52α to 52d . The circuit of each of these units is enclosed in FIG. 3 by the dashed line 52. The outputs of the gate circuits 35 of these units are connected to the input of the error indicator 50 via a common line 60. The error indicator is therefore actuated when any of the units detects that two pulses are occurring at the same time.

The clock pulse output of the unit 52 α is directly connected to the input of the counter 37. The clock pulse outputs of the units 52 b, 52 c and 52 d are, however, with the counter 37 via lines 45 b, 45 c and 45 c? as well as via delay circuits 61 b, 61 c and 61 d in connection. The delays produced by these circuits are different so that the clock pulses are supplied to the counter in sequence, although they can be produced simultaneously. The longest delay resulting from the circuit 61 d is shorter than the time between the sensing of successive digits. The delay circuits 61 and the other delay circuits, such as. B. 17, are preferably conventional delay circuits with a constant delay time.

The group marking signals are sensed from a track 58 with the aid of a head 62 and fed to a gate circuit 38 and to the counter 42 , in a manner similar to that described in connection with FIG. The gate circuit 38 therefore supplies a signal which actuates the error indicator if the digit count made by the counter 37 is incorrect.

Claims (10)

Patent claims: 1. Procedure for checking the correct reproduction of data transmitted through on a recording medium captured signals are displayed and stored in a channel in a form and recorded in a second channel in a different form, with the help of a converter for the two channels for generating electrical signal sequences, characterized in that the individual components or bits of the signals in the two channels inversely and the numerical values the overall representation of a data entry complementary to each other in the two channels are recorded and that in a comparator (Fig. 3) the electrical signal sequences and the Error signals (50) indicate whether signals are occurring at the corresponding points on the two channels. 2. The method according to claim 1, characterized in that counting devices (37) which the count electrical signals corresponding to the two data entries, an error signal (50) when the count value of a data entry deviates from a certain value. 3. The method according to claims 1 and 2, characterized in that the complementary in the Data entries (2,3) in binary code or
binary encrypted decimal code are available. 4. The method according to claims 1 to 3, characterized in that the combined Signal sequences of the two channels result in a clock pulse train. 5. The method according to claims 1 to 4, characterized in that the data entries Group marker signals (4) assigned and when sensing the group marker signals electrical signals are generated which are fed to a gate circuit controlled by the counter to check the count recorded by the counter. 6. The method according to claims 1 to 5, characterized in that the signal sequences of the both channels of a gate circuit (35) are fed to the simultaneous occurrence of signals an error signal is generated in both sequences. 7. The method according to claims 1 to 6, characterized in that the electrical signals, which correspond to the group marking signals, fed to a group counter (42) that controls the transmission of selected data. 8. Device for recording pulses, which a test method according to claims 1 to 7 enable, characterized in that two gate circuits (11, 12) each have a recording magnetic head (13, 14) is connected and that these two gate circuits clock pulses (47) are supplied, that also a bistable arrangement (10) of the data input pulses (46) is brought into a stable state and that the bistable arrangement after the occurrence of the input signals is switched, the gate circuits from the bistable arrangement be controlled so that the gate circuit is effective when the arrangement is in one state, and the other gate circuit is effective when the arrangement is in the other state. 9. Apparatus according to claim 8, characterized in that the source of the clock pulses (47) with the two gate circuits via a further gate circuit controlled by a counter (18, 19, 20) (16) is in communication, the counter being actuated by the clock pulses and the supply of predetermined clock pulses to the two gate circuits (11, 12) prevented to regularly cause recurring interruptions in the recording. 10. Apparatus according to claims 8 and 9, characterized in that the clock pulses a Activate another counter (22) which generates group marking signals for the recording. Considered publications:
U.S. Patent No. 2,628,346;
Swiss patents No. 224 999,
600; Electronic Engineering, 1954, pp. 386 to 392. 1 sheet of drawings © 909 650/246 11.59 '