DE1133756B - Circuit arrangement for checking coding characters which are represented in a multi-part coding - Google Patents

Description

When transmitting coded information, it is often necessary to check the correctness of the Determine transmission. For example, the information can be transmitted with the help of radio waves or transmitted over a line from one location to another distant location, however the transfer can also take place between two recording devices or memories.

It is already known to encode the information to be transmitted in such a way that certain errors occur Receipt of the information can be recognized without further ado. In the simplest case, a coding is used for this uses an odd number of for each of the coding characters (e.g. letters) Contains coding elements of a certain type. Each received character is then checked for whether it contains the odd number of the selected coding elements. In this procedure however, an exchange of the coding elements was not discovered. By increasing the coding positions the exam can also be improved.

Since the detection of errors requires a certain type of coding, the sent and received coding characters must be coded in the same way.

The invention relates to a system for checking coding characters in which the original Information in a first coding and the information to be checked in a different coding Coding is represented. It is also provided for two pieces of information, which are in two different Coding systems are reproduced, to check that both information representations in one third coding transmitted and the two information representations can be compared in the third coding.

In the description below, the first and second codes are unambiguous, which means that in these codes each character that can be represented corresponds to a specific combination of coding elements. Each coding combination is unique in this way, it corresponds to a character. The third coding, however, cannot be unambiguous. In this case, a particular coding combination can correspond to a group of characters, so that each character in this group is not clearly represented. It follows that errors that are discovered are those in which the character, which is registered by the actuation of a combination of magnets P1 to P 4, is circuitry for checking

of coding characters,

those in a multi-part coding

are shown

Applicant:

International Computers and Tabulators
Limited, London

Representative: Dipl.-Ing. W. Cohausz,

Dipl.-Ing. W. Florack and Dipl.-Ing. K.-H. Ice egg,

Patent attorneys, Düsseldorf, Schumannstr. 97

Claimed priority:
Great Britain of July 2, 1957 (No. 20 848)

James Woodhead, Letchworth, Herdfordshire

(Great Britain),
has been named as the inventor

differs from that applied to the device in such a way that the corresponding Representations in the third coding did not match.

The circuit arrangement for checking coding characters in a first multi-part coding are shown and implemented in a second coding, which has fewer links than the first coding and in which a first coding converter for converting information from the first into the second coding and a registration device for registering the information in the second code are included, is characterized in that this registration is checked, in that a second converter is operated at the same time as the first converter, which transmits the information into a third, reduced-number coding, in which two or more pieces of information are replaced by a single one Combination of code members are shown, implements, and that a switching network under control is operated by the registration device in order to convert the registered information into the third coding, wherein the second converter and the switching network cooperate to convert the representations in the third coding and compare one of

209 627/214

to operate two display devices, according to whether the representations in the third coding are identical are or not.

Embodiments of the invention will be described in more detail with reference to the drawings.

Fig. 1 shows a circuit arrangement of a test circuit with a device for punching a strip of paper can work together;

Fig. 2 shows a modified circuit for selectively determining the test elements;

FIG. 3 shows part of a test circuit which is used in connection with the circuit shown in FIG can be used.

In the embodiment according to FIG. 1,

L

In the example given, the latter property is used for testing. The input digits 0, 2, 3, 5, 6 and 7 are each represented by an odd number of perforations, while the digits 1, 4, 8 and 9 are represented by an even number of perforations. The lines 10, which emanate from the keys 0, 2, 3, S, 6 and 7 are therefore each connected via a diode 13 to an "odd" test line 14, and the lines ίο those from the keys 1, 4 , 8 and 9 are connected to a “straight” test line 15 in a corresponding manner. The lines 15 and 14 are connected to a cascade of contacts which interact with the punching electromagnets. Everyone

taken that in a decimal coding 15 armature of an electromagnet actuated two toggle reproduced information part through the selection contacts, which is shown in Fig. 1 in the non-actuated position of one of ten lines and are shown with the help, and also the corresponding cyclically operating registration device on the punching devices. Which is to be registered with the magnet Pl to a suitable carrier. A paper tape is used as carrier-cooperating contact points with Pia ger, for example, and 20 or PIb are designated, and in a corresponding manner during a working cycle of the registration device, the contacts of the other electromagnets are characterized by the information part in a different Ko reference number . If one of the elecdation registers. It is now to be checked whether the magnet responds, the information has been correctly registered with it. interacting contact points switched and

In the illustrated embodiment 25, this reverses the circuits in the test lines numerical information to a punching device.

If a test is to be carried out,

registered to the paper strip. Such a paper start button ST is actuated and a relay strip is activated, for example, in this context, R 2 via a circuit used in telegraphing systems, namely 30 from line 12 via contact point 4a, start in one Five-digit coding, which is also available under the ST button, PC contact point and relay coil i? 2 leads to the drawing "Baudot" coding for registration purposes earth. Relayi? 2 closes contact pointi? 2a is used. Each piece of information is parallel to the start button and closes itself by perforating a hole in one or more circles. Contact point i? 2 b des Relaisi? 2, reren of five layers registered in the paper strip. 35, which is in the circuit of the punching electromagnets punching machines for punching paper strips, is closed, and it enables

that these magnets can be energized when the contact point of a number key is closed.

Closing the contact point of a numeric key 40 causes the corresponding punching magnet during this time are excited, and the corresponding punch magnet contacts can thereby also be switched will. This completes a circuit from the contact of the numeric key

11 with suitable punching electromagnets P1 to P 5 45 one of the lines 14 and 15 through the cascade of tied together. If, for example, the number »2« runs through punch magnet contacts and a relay i? 3 or is to be stared, key 2 is pressed and it i? 4 makes you respond.

an electric circuit is closed, which is

Power line 12 via key 2 to line 10 and even «group 0, 2, 3, 5, 6 or 7, which then interacts via diodes 11 in parallel with electrical 50 line 14 and an odd number of magnets Pl, P 2 and P 5 leads. The winding ends of punch magnet contacts is switched over, but the electromagnets are via a contact point. 2 b acts earthed by the cascade of these contacts when this contact point in a circuit that has yet to be decided that the relay i? 3 responds, closes in writing. If, on the other hand, an even number of contacts around electromagnets P1, P 2 and P 5 are excited and they are switched on, the circuit is changed in such a way that corresponding holes are punched out so that the relay i? 4 responds and an error message is sent to the key provided with the number »2«.

correspond. I _n a corresponding manner, the relay R 3 of

In order to now check whether the "straight" line 15 in the strip is activated, Punched code combinations are free of errors, a 60 if there is an even number of punched magnetic contacts Test key is used, the properties of which are toggled under, while the changeover is a Taking into account a feature of the incoming odd number causes the relay i? 4 other outgoing information can be selected. Speaking.

For example, the feature can be used whether the relay is in error-free operation

address the coding elements of a type odd or ge 6 ₅ i? 3 and contact point i? 3 α close, so are even or whether the output is an odd one or one that a short circuit across the contact point PC in the even number of perforations to represent the hold circuit of the relay i? 2 is generated. Has the punched individual digits. The device for the paper strip in Fig. 1 is designed so

of this type are known, and in the illustrated embodiment, the five hole magnets operated individually by energizing an electromagnet.

Ten keys, which are shown with the reference numerals 0 to 9 in Fig. 1, are used to introduce the Information, and each key is connected to a line 10. The individual lines are via diodes

5 6

that the excitation of one of the electromagnets Pl until if with the help of the diodes 13 in the test key P 5 sets a punching cycle in motion. While this translates. The punching electromagnets are equipped with a Kon cycle, the contact point PC is provided with cam-actuated clocking points that open in cooperation with devices, and the punching devices selected by the electrodes of the voltage line from the test relays 3 and 4 demagnets will generate responsive test key signals. The R then causes corresponding holes in the lais 3 and 4 to compare the test key values to punch the strips. The strip is then shifted from the contact points and the transmitter diodes so that the next registration system is created at 13, and if they are identical, the punching point is ready and the contact point PC relay 3 is made to respond, so that the register is subsequently at the end of the Punching cycle can be carried out in the io stration. If, however, no over-displayed normal position is offset. If there is agreement, the error relay 4 is brought to response during the punching cycle, the contact point, so that an error signal generates R 3 α the circuit of the relay R 2 upright, and it is,
the corresponding holes are punched out. In the example described, the test

If, however, an error occurs, relay 15 key, taking into account a simple R4 , causes contact point /? 4 b to close, so that a property of the output key is selected, i.e. the self-holding circuit is formed, which is determined by line 12, whether the number of magnets, which had to address the contact point RS of the reset button to position an information part, winding of relay R 4 leads. The point of contact was odd or even. Since there are only two possibilities of such properties, R 4 α in the hold circuit of the relay /? 2 is opened, at least so that the relay can return to one half of the input digits under one of these possibilities. opportunities fall. A more effective verification key can

The contact point R2b in the punch magnet is formed in that a property as an excitation circuit is opened, and the punch magnet is used as the basis for the test key when de-energized. A punching cycle is through the first 25 of which there are more than two options. An example excitation of the punching magnet is initiated, however, for the selection of the test leads according to a test key with three classes of possibilities due to the timing of the punching cycle, it is ensured that the contact point R 2 b is open and FIG. 2 is shown. In order to combine the representation, the punch magnets are de-energized before the punch, only the selection lines are presented. During this cycle no 30s are made, with the connections from the button holes punched into the strip, however the contacts to the punch magnets are advanced in a similar manner to the strip in the usual manner. Since, however, can be designed as in Fig. 1. The lines as a result of the further excitation of relay R 4 that corresponds to lines 10 (0) to 10 (9) remains de-energized in relay R 2 , the machine cannot Fig. 1 and you can continue working with key contacts 0 to 9, so that the cause of the error is firmly connected according to the figures. Any that can be asked. Lines 10 (0) to 10 (9) are connected to one via diodes 16

The circuits are reset by the reset button or several of the lines 17, 18 and 19.

returned to the normal position, with the closed. One of these lines is selected

Contact point RS of the reset button opens and taking into account the exit key. the

Holding circuit for relay R 4 disconnects. Then the 4 ° line 17 is selected if the encrypted

Relay /? 2 activated again by representing the input digit the excitation of a

the contact point ST of the start button is closed. or both magnets Pl and P 4 required. The line

will. device 18 is selected if the representation

In the event that faults in the device cause excitement of one or both magnets P 2 and P 3 , and also if an incorrect number of 45 is required, and line 19 is selected when the punch magnet is selected also the magnet P 5 is to be excited. So there are relay /? 3 and R 4 addressing together (in short, possible selection combinations for these faulty connections), or none of them will respond to lines, and in the example shown are (error that avoids by opening a circle five individual possibilities, each of which is the cause). 50 can be selected to represent only one digit.

In the former case, the effect of the relay R 4 is therefore better. This key is therefore better used for testing purposes.

the action of the relay /? 3, and the relay /? 2 is suitable as the system provided in FIG. The line

is switched off in the manner described. If lines 17, 18 and 19 can become a suitable one

none of the two relays R 3 and R 4 is actuated, switching of stamping magnet contacts are carried out,

the contact point R 3 α remains open, and the relay 55 to a fault indicator relay in a similar manner as

R 2 is switched off when the contact point PC in Fig. 1 to respond,

opens at the beginning of the punching cycle, so that again the circuit can be simplified by

no punching takes place. In this case, however, that a circuit part corresponding to FIG. 3 is used

the relay R 2 is activated again when the fault signal is activated. Each of the lines 17, 18 and 19 is with one

device by closing the contact point ST of the start 60 such circuit part via an input line 20

button has been eliminated, with an opening of the con-connected. The contact points Pa and Pb become

clock point RS of the reset button is not necessary. actuated by the punching magnets with which the

The keys 0 to 9 are connected according to the transmission line, and they are closed in Erobigen versions to generate electrical excitation of one or both magnets, signals are used according to the decimal key. 65 On the other hand, each magnet can also have its own. These first signals are obtained by switching the pair of contacts, and the contacts Pa and Pb diodes 11 are converted into the five-key for actuation of the set then a parallel connection of the corresponding punching device, and they become even contacts the punch magnet.

An output line OP is connected to a point 22 via a diode 21. This point lies on a voltage divider circuit, which consists of three resistors 23, 24 and 25, which lie between a voltage line 26 with high potential and a bias line 27. The ratio of the resistors is such that when no contacts are closed, the potential of the output line OP is equal to the potential of the

Transmission. The transmission can be done in a simple manner that a relay is provided for each of the five input lines and the contacts of these relays have the task of 5 to select one of the ten output lines in a transmission circuit. When the output of the Transmission circuit to initiate the punching process, the individual punching electromagnets can each be connected to an output line, and

Voltage line 12 (Figs. 1 and 3). In correspond io the electromagnets can so be actuated chender way, in closing a KEYER that one of the electric power lines with contact, which is connected schematically with the reference numeral K of the input side of the transmission circuit verdurch the dashed lines in FIG. 3 simplified, the second voltage line is also drawn in and which is connected to line 20 to the other connections of all electromagnets, and a current allele is connected when the punched contacts are closed. In order to take the examination vorzukreis closed from line 12 via Tastenkontakt-, the electromagnets may correspondingly point K, contact point Pa and diode output line 28 divided for training the verification key in certain groups, so that this line be at the potential of such. B. according to the intended »Under line 12 is held. If now the "straight line" key, which was described in connection with the punching magnets, the key conditions 20 with FIG. 1. If the input digit does not correspond to the line OP, the second connections of all electromagnets are kept at a constant potential. If, on the other hand, the only voltage line is connected, but instead the excitation of the punch magnet is not in accordance with two lines are provided, one of which stands for all the operation of the numeric key, there is an "odd" magnet connected, while the connection that connects the line 12 with one Potential 25 that connects the other point 29 of the voltage divider circuit to all the "straight" magnets, so is. These two lines are then connected to one that the potential at point 22 drops. Contact cascade placed, which corresponds to the in Fig. 1

If a button can be designed without the corresponding circuit shown and the gneten is actuated, the circuit runs from Lei- with corresponding input relay interacts, tang 12 to point 29 via a diode 30. If 30 This cascade is then connected to the second voltage Stamped magnet contacts are actuated when the line is connected, so that an electromagnet that does not press the speaking button runs the
Circuit via contact point Pb and a diode 31,
diode 30 preventing current from flowing through pad Pa to line OP .

The potential of the output line then follows the potential at point 22, so that an error it is indicated that the potential at the output line is falling.

The output lines OP from the test circuits 40 do not connect if the transmission of genes which are in contact with the lines 17, 18, 19 (FIG. 2) is "rejected".

are bound, can each be attached to the control grid of a

Electron tube to be placed. The anode circuit of the len is prevented in the event of a fault that the tube can contain a relay that can take place in the normal punching process, and it can also be energized wisely and that drops out when a corresponding display occurs through a 45 that a fault has occurred Error display the potential of the control grid has been detected. However, it is also possible that is set. On the other hand, a single error display can also be used to carry out certain control tubes and a relay for all test circuits to use upstream or control functions. For example, the output lines of the circuits described in connection with FIG. 1 can be connected to the control grid via diodes, punching device for the paper strip, so that the potential can be lowered. So z. B. the punching on one of the output lines causes the magnet to be designed so that it drops off the appropriate punching relay. This relay can then be used to select parts that appropriate locks are released to pawl the punching process in a similar manner or that mechanical interruption, as described in connection with the 55 intermediate links between the relay R 3 of FIG. 1 used for punching became. Deten parts and actuated a feed device

In the examples described, this was used. The feed device can then be assumed that the test key under consideration of a contact of the relay R 3 are operated. Taking into account certain properties of the output, a further feed of the tape is formed. However, it can also be prevented and it is avoided that an indefinite characteristic of the input key, the perforated position, occurs when the test contacts are turned in order to form the test key. An error has been detected; It is also possible to reintroduce the input information, for example, in the mentioned input information, so that types are formed when input information is completely perforated, when all information in the telegraph code described is completely inserted in 65 tion parts, one according to the situation encrypted output over- In the event that the information is automatic

will carry; compared to the previously described are introduced, for example when the Transmission now takes place complementary input information from a continuously transmitted

is selected by the transformer circuit, can only respond if he is in the "odd" - or "Even" group falls in accordance with the settings 35 of the test contacts. One can also get an error signal obtained by providing a relay connected in series with the second voltage line the test contacts. The relay responds to every error-free transmission, but it does

the test

running memory (ζ. B. perforated tapes or magnetic tapes) by a continuously working Interrogation device is removed, the control options can be supplemented in such a way that that upon detection of an error the carrier of the registration for a certain time in its direction of movement vice versa and the incorrectly transmitted information is queried again. This possibility is of particular value when information is on or on a magnetic tape a magnetic drum are registered automatically to a paper tape or to a printing device are transferred. The first error display then causes the information to be read again. at Using a magnetic tape, the tape is then reserved for a short distance, and an new query; when using a magnetic drum, it is advisable to use a complete rotation of the drum. If then the information is also available for the second query leads to an error display, an error signal or an error symbol can be stamped or imprinted and the automatic query of the information will continue.

The test system provided according to the invention is generally applicable to the transmission of information and data from one key system to another, the input and output devices can also be designed in a different way, d. H. not as buttons or as punching devices need to be trained.

Claims (5)

PATENT CLAIMS: 1. Circuit arrangement for checking coding characters that are shown in a first multi-part coding and are converted into a second coding which has fewer elements than the first coding and in which a first coding converter for converting information from the first into the second coding and a registration device for registering the information in the second code, characterized in that this registration is checked by a second converter (13, 14, 15) is actuated simultaneously with the first converter (10, 11), which converts the information into a third coding with reduced number of elements in which two or more pieces of information are represented by a single combination of code elements, and that a switching network (Pia to P5a, PIb to PSb) operated under the control of the registration device (P 1 to P 5) is to convert the registered information into the third coding, the second e converter (13, 14, 15) and the switching network (PXa to P5a, PIb to P5b) cooperate in order to compare the representations in the third coding and to operate one of two display devices (R 3, R 4) , according to whether the representations in the third coding are identical or not. 2. Circuit arrangement according to claim 1, characterized in that a circuit arrangement is provided when an error is indicated by the display device (R 4) which causes the information carrier to be scanned a second time. 3. Circuit arrangement according to claim 1 or 2, characterized in that when an error is indicated by the display device (R 4), a switching arrangement is provided which prevents registration by the registration device (Fl to P 5). 4. Circuit arrangement according to claim 3, characterized in that the setting of the registration elements is deleted by actuating the display device (R 4) before registration takes place. 5. Circuit arrangement according to one of claims 1 to 4, characterized in that the display devices (R3, R 4 ) actuate the contact points (R 3 a, R 4 a) which prevent the registration device (Pl to P 5) from being put into operation when both display devices (R 3, R 4) or none of the display devices (R 3, R 4) are operated. 1 sheet of drawings © 209 627/214 7.