DE1173132B - Code converter for code characters that are structured according to the binary system - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN SMTWWt PATENT OFFICE

EDITORIAL

Boarding school Kl .: -OW-t

3efzf

Pat. BI.

German class: 21 al - 36/20

Number: 1173132 ΚΜί, ϊ

File number: H 41031 VIII a / 21 al

Filing date: November 23, 1960

Opening day: July 2nd, 1964

The invention relates to a code converter for an input code, the code characters of which each consist of η elements, each of which, in the sense of digital computing technology according to the binary system, is expressed only by one or the other of two predetermined states, with only some of the possible combinations of η Elements are assigned characters, and an output code whose code characters each consist of m elements, each of which is expressed in the sense of the computing technology mentioned only by one or the other of two predetermined states. The two predetermined states can e.g. B. "Current / no current", "Current in one direction / current in the opposite direction" or two different phase relationships.

The invention is based on the object of creating a code converter that only works with the input signals that are determined by the code structure Characters are assigned, provides output signals.

In a known device for error detection, for example, when using the 7-element codes (CCITT code No. 3) out of the hundred and twenty-eight possible combinations of code elements only the thirty-five combinations used as characters, consisting of three working and four Rest elements are formed. The receiving device checks for each received signal whether the same is formed from three working and four resting elements. If this is not the case, there is a malfunction. It is obvious that this test requires time during which the signals are to be processed before further processing must be saved until they can be recognized as undisturbed and passed on. It is Usually, the last three characters are stored in a capacitor memory on the transmission side and delete the first character saved and save the fourth character when no character was recognized as faulty and therefore no repetition is necessary. This well-known facility is only applicable if exactly thirty-five characters are used. It can't either a single character more or less used because the criterion whether the received signal is made three work and four rest elements are formed, then nothing would say anything about whether one There is a fault. You can possibly use a different criterion, but then you have to use another one very specific number of signals are used, which is equal to the number of combinations of code elements is which meet this criterion.

According to the invention, the code converter circuit is designed so that only the specific code converter for code characters after the
Binary system

Applicant:

Hasler A. G., Bern

Representative:

Dr. W. Andrejewski, patent attorney,

Essen, Kettwiger Str. 36

Named as inventor:

Dipl.-Ing. Hans Diggelmann, Bern

Claimed priority:

Switzerland of December 2, 1959 (81 344)

Input combinations assigned to characters lead to output signals. One is unnecessary complicated means for checking how the combination of the input signal is composed, and the time required for this check is also eliminated during the transfer.

In addition, there is no limit to the number of characters used, apart from the Obvious condition that this must be smaller than the number of possible combinations of Code elements.

The invention is based on a code converter with a matrix circuit which has η input poles, which are each assigned to an element of the input code characters, and η line pairs, which belong to a first group of lines, each input pole being connected directly to a line of one of the line pairs and via an inversion circuit is connected to the other line of the pair.

The code converter according to the invention is characterized by a second group of lines (A to Z and "carriage return" to "monitoring signal β" [Fig. 4]), each of which is assigned to a character and with the η lines of the line pairs which correspond to those elements of the character associated code characters are assigned, which are expressed by matching states, each by a circuit element, ζ. B. a rectifier, a relay, a magnetic core with windings connected

409 628/267

which depends on the voltage prevailing at the connection point.

F i g. 1 shows an arrangement in which η control stages 11 offer the code converter 12a the η elements 1 to η of a received character in parallel form 5. The code converter 12a, which can be constructed using any of the known techniques (with relays, diodes, magnetic cores, etc.), fishes out those m combinations from the 2 possible combinations that are intended for further processing and outputs on the corresponding der m outputs A ₁ , A ₂ ... _{A m} emits a signal. This signal is fed to the destination 13 of the information directly or via a further code converter \ 2b. 15th

As an example, the 7-element code CCITT No. 3 is offered to the code converter 12a in FIG. The converter 12 a has thirty-five outputs A ₁ , A ₂ , A ₃ in this case. ..A ₃₅ , with a signal on

consists of two intersecting groups of parallel conductors, where

a) the first group comprises 2 ti + m conductors;

b) the second group comprises as many conductors as there are meaningful code characters;

c) each «code element is assigned two conductors of the first group, one of which is the incoming one Signal directly and whose other the incoming signal is supplied via an inversion circuit;

d) one of the other conductors for each «i-code element assigned to the first group;

e) those crossing points are bridged by rectifiers that are associated with the structure of the Correspond to the code signal.

but from output A ₉ , which emits a signal for the combination (00000) (= "imperforate strip") and the point χ in FIG. 3 corresponds. the

from a voltage divider, which is formed from the resistors R ₁ and A ₂ , and a transistor T, which is connected to the inputs via resistors R ₁ and R ₂

The conductors of the first group are horizontal in the exemplary embodiment, those of the second group to any one of these outputs means that according to FIG. 20, the lines are drawn vertically. The collective circuit 14 receives code table assigned 7-combination receive their signals from the outputs A ₁ .. .A _s , also was. Thirty-two of these exits will then
out into the code converter 12b , which in turn
on five outputs A ₁ , A ₂ ... A ₅ ' the thirty-two
Combinations of the 5-element code CCITT No. 2 25 inversion circuit 15 inverts the can of the collective delivery. The remaining three outputs A ₃₃ , A _3i , circuit 14 received signal and are there as an error A _{35 of} the code converter 12a lead directly to the signal on the output A ₁₀ . 16 are inversion destinations of the message 13. circuits used in the transcoder itself

A collective circuit 14 in FIGS. 1 and 2 can be transferred.

monitors all outputs of the code converter 12 a. 30 The inversion circuits 15 and 16, which are iden-As soon as a table can be set up on any of the outputs of 12, for example, a signal appears, it is passed via 14 to an inversion circuit 15, at whose output there is no
Signal is present. Receives the collective circuit 14

but no signal from any of the outputs of 12 a, so 35 output signals are opened or * blocked, and it will not forward any signal to 15 either. In this one collector resistor R ₃ , the task of which is to compensate for the damaging reverse currents of the transistor and the device 15, a signal appears at the output of the inversion circuit. sate. The elements are dimensioned such that

3 shows a further development of the same 40 at the collector when a signal occurs when there is no signal at the one-way principle, but with the two code converters 12a output, and vice versa. The and 12b of Fig. 1 in a single circuit 12 code converter 12 consists except those described have been combined. In this case, inversion circuits 16 are made from a network with the presence or twenty-three rows and thirty-five columns at the outputs A _x ... A) c. Absence of one or more signals with 45 The first fourteen lines lead alternately with the help of the circuits 14 and 15, the input signals E ₁ to E ₇ and their inversions, however, the case in which the code combinations- Each of the columns is one of the thirty-five possible tion is received, which is assigned by the code converter combinations of the 7-element code CCITT No. 3 in the combination (1) = 0, (2) = 0, (3) = 0 / ... (k) . Each column is converted via a resistor Λ ₄ = 0, treated separately 50 connected to a negative supply voltage and must. The code converter is therefore energized for this purpose, provided that this is provided with an additional output χ , which is not prevented by the diodes D ₁ . This signal is emitted to the collective circuit 14 when the diodes are in such a way received a certain selection of said combination. Crossing points used that only on the other

In Fig. 4 is an embodiment of those in 55 those column whose designation is shown with that of the basic circuit shown in FIG. In applied input combination matches, one of these figure 11 represents the seven control stages that voltage can occur. This voltage is generated by the code converter 12 via the inputs E ₁ ... E ₇ further diodes D ₂ , which feed the remaining nine lines. The destination of the message 13 is connected to the columns, in such a way that the outputs A _{1 are} communicated on the one hand with the 5-element code CCITT No. 2 60 to A ₉ that at these points the corresponding output A ₁ . . ^ A _{5 of} the code converter chende 5-element signal or one of the three over- and on the other hand with three monitoring signals over wachungssignale or that of the combination (00000) the outputs A _e .. .A _{s of} the code converter fed. corresponding signal occurs.

Assuming that one consisting of η elements, the collective circuit 14 consists of nine diodes

Code ( "code) in a group consisting of m elements 65 D _3, which are connected in such a manner that an arbitrary code (M-code) to be converted, the signal at points A ₁ .A .. ₉ is an output signal A ₁₁ causes code converter in the case of the exemplary embodiment. This signal is generated in circuit 15, FIG. 4, from an electrical network which is inverted, as has already been described for FIG. At the

An error signal can therefore only occur at output A ₁₀ if there is no signal at A ₁₁ and thus also not at any of the outputs A ₁ ... _{A 2} .

Claims (5)

5 claims: 1. Code converter for an input code, the code characters of which consist of η elements, each of which is expressed in the sense of digital computing technology according to the binary system only by one or the other of two predetermined states, with only part of the possible combinations of the η elements assigned characters and an output code, the code characters of which each consist of m elements, each of which is expressed in the sense of the aforementioned computing technology only by one or the other of two predetermined states, with a matrix circuit with η input poles, which are each assigned to one element of the input code characters, and η line pairs which belong to a first group of lines, each input pole being directly connected to a line of one of the line pairs and via an inversion or inverter circuit to the other line of the pair, characterized by a second group of lines (A to Z and »carriage return «To» monitoring signal / 3 «[ F i g. 4]), each of which is assigned to a character and is connected to the η lines of the line pairs which are assigned to those elements of the code character belonging to the character that are expressed by matching states, by a circuit element (D ₁ ) z. B. a rectifier, a relay, a magnetic core with windings is connected, which is dependent on the voltage prevailing at the connection point. 2. Code converter according to claim 1, characterized in that the first group of lines apart from said line pairs m lines (A ₁ ... A ₅ ) , each of which is assigned to an element of the output code characters and at intersections with the selected to differentiate the output code signals from each other Conductors of the second group are each connected by a circuit element of the type mentioned. 3. Code converter according to claim 1 or 2, with error monitoring or correction, characterized in that all signal output lines (A ₁ .. .A ₈ in F i g. 4) or, in the case of a multi-stage code converter, all output lines of a stage (A ₁ . _{..A 35} in Fig. 2), are connected to a circuit (14,15) which responds to the simultaneous absence of voltage on these lines. 4. Code converter according to claims 2 and 3, characterized by a monitoring circuit which responds to the simultaneous absence of voltage of the m conductors of the first group and command signals associated conductors of the second group. 5. Code converter according to claim 3 or 4, characterized in that the circuit responding to the absence of _{voltage of the said conductors (^ 1} .. _{.A s} in FIG. 4, A ₁ .. .A _{35 in FIG. 2)} a collecting circuit (14) and an inversion circuit (15) connected downstream of this, in the output of which an error display or correction signal occurs when the said conductors are simultaneously de-energized. 1 sheet of drawings 409 628/267 6.64 © Bundesdruckerei Berlin