DE1018452B - Automatic testing device for the identification of faults in pipes and other switching means of an electronic device for encryption and decryption of telex characters - Google Patents

Description

GERMAN

The invention relates to an automatic test device for monitoring an already proposed electronic-mechanical scanner for telex characters.

The invention uses pulses for testing and provides an automatic test circuit for this purpose before, which in the event of errors in tubes and other switching means of the scanning device for a first category teletype indicates errors by a device in such a way that a the second category of teletype characters, either directly or indirectly, determines that a teletype character is made up the first category formed pulse chain or a pulse train in the scanning device completely is.

The first category of telex characters is to be understood as meaning those telex characters that consist of a Scanning device originate with a key strip. This scanning device receives through the interaction a start-stop pulse wave with binary Counting circuits and a matrix synchronous with the plain text or encrypted line characters and depending on. the start impulse of these characters impulses through the punched hole combinations are controlled in the key strip, wherein a pulse after scanning a key character is used to this punched tape to shift further. The second category of telex characters are those on the line understand incoming plain text or encrypted telex characters.

For testing, the invention uses pulses which correspond to the code elements of the first category of telex characters which can give one or two paths in the scanner and later can be combined into a complete pulse train of character current pulses.

The invention continues to be used in the pulse chain an impulse generated by the indexing of the punched tape for the key text to the next Position is generated. Is this pulse train, which continues to be one in front of the code elements of the telex code lying impulse of an impulse source is used, not completely, i. i.e., it lacks a or several character stream pulses, the transmission of teletype characters is carried out according to the invention automatically interrupted. An alarm can be given at the same time if an error occurs occured. The invention therefore provides for a test of the test circuit in the main circuit when a plain text transmission takes place.

An embodiment of the invention will be explained in more detail with reference to the drawings.

Fig. 1 shows schematically a device of the Er-automatic test device

to identify faults

in tubes and other switching devices

an electronic device

for encryption and decryption

of telex characters

Applicant:

Standard Telefon og Kabelfabrik A / S _r
Oslo

Representative: Dipl.-Ing. H. Ciaessen, patent attorney,
Stuttgart-Zuffenhausen, Hellmuth-Hirth-Str. 42

Claimed priority:
Norway January 18, 1954

Kaare R. Meisingset, Stabekk,

and Terje Thauland, Ronde, Ski st. (Norway),

have been named as inventors

finding. The teletype signals are given on line 11 and to a start-stop circuit out, which starts a pulse source 2 via a connection 12. This pulse source can consist of a Start-stop oscillator, an amplifier and a differentiating network, which appropriate pulses generated, exist. The pulses from the pulse source become one via a connecting line Counting circuit 3 out. A multiple connection 14 from the flip-flop circuit in the counting circuit controls a die 4. This die generates pulses and outputs them to a multiple line 15, the leads to the scanning device S. At the same time, however, these impulses become directionally sensitive control circuits 8 and 9 out. The control circuit 9 also receives the incoming telex characters, d. H. Five code combinations, supplied on line 11.

In the case of the absence of at least one pulse of the pulse train in the control circuit 9 is a telex code character on line 11 a separator

709 758/141

Have current element that corresponds to a missing pulse of the pulse train, and thereby trigger a pulse on line 91 and in this way indicate a fault.

Fig. 2 shows another embodiment comprising the same units 1 to 4 and the scanning device 5, which in this case is provided with two outputs; one of these carries the scan code character, and the other does the reversal

so that the tube F15 becomes non-conductive. The output of the tube F15 controls an oscillator control tube F8, which in turn controls a stop tube F9, whose output leads to a pulse source, which comprises a start-stop-time Oszlllatorröhre VlOA and an intensifier tube I "10 B. The time constant of the multivibrator is chosen so that this device returns to the normal state, e.g. tube F15 becomes conductive after a period,

of this sign. These two outputs are with the io whose duration corresponds to seven code elements, interconnected direction-sensitive The start-stop activity is by means of the tube

Control circuits 8, 9 connected. F9 controlled. When the circuit is idle

Fig. 3A shows various pulse shapes which are positively biased into this tube, and thus it is conductive to the various embodiments of the invention and produces a low impedance are used. The pulse α in Fig. 3A, which is parallel to the frequency-dependent current, is a pulse which corresponds to the start signal. The circle.

Pulses b to / are pulses that correspond to code elements 1 If a start pulse of a telex code

to 5 correspond. The combined pulse g is recorded on the multivibrator V 14 and F15 keep after combining the individual pulses α to / is, it blocks the stop current and the oscillator in a control circuit. An incoming remote 20 starts up without any Einnvingvorgangs, so that the write code character is achieved by the pulse signal h that the stop current draws the correct order of magnitude. The momentum j designates a momentum. The waveform of the output of the Start-Stopnet, which occurs in the time between 10 and 20 ms from the oscillator tube V10A, is sinusoidal, and the first start of the start signal of the incoming signal on half-wave is positive. The duration of a full step. The pulse k is obtained from the switching mechanism 25-digen period is equal to the duration of one code element, the scanner. When the impulses; , b. The output from the start-stop oscillator tube is c, d, e, f and k combined in a control circuit shown in Fig. 9 by curve A , a pulse / is obtained. This pulse can The sinusoidal oscillation of the tube VlOA is carried out by

amplified in the other control circuit with the encrypted amplifier tube VlOB . The output teleprint code characters, labeled m, combined 30 of the tube will be the first stage of a three stage. binary counter put out of the flip-flop tubes

Fig. 3B shows a device of the invention in which "'' 1I, VYl and F13 (Fig. 6). Which the incoming telex code characters to the appropriate biasing of the tube FIO B

Line 11 are placed and this a start-stop, it is possible to obtain an output wave that is fed in circuit 1, to which a pulse 35 of FIG. 9 is represented by the figure B , or source 2 controls. This pulse source controls a counting wave as shown by curve C. Circuit which is connected to a die 4 In the latter case it is necessary to have a special one. This matrix is fed to the binary counter with a scanning device 5 counting pulse, for example connected several times via connection 15, and the outputs of an amplifier or modulator of this scanning device lead to a tube of the control circuit. This is necessary because control circuit 8. The three-stage binary counter leads eight trigger pulses to this control circuit
^ 'Pulse appears. The control circuit 8 is also
a pulse k supplied to the switching mechanism
the scanning device 5 is removed. The 45
gear of the control circuit 8 leads over the conn

tion 19 to a further control circuit 9, which is also via the line 71 the outgoing code characters are fed. One of the line's code characters

71 has a separating current element, which then in 50 the tube part.

necessary to regain the state of rest while only having seven complete pulses of that Oscillator can be obtained.

Each flip-flop tube FIl, V 12 and V 13 arranged in the binary counter so that it can only be triggered symmetrically by negative pulses applied to both grids, or asymmetrically by positive pulses to the grid of the non-conducting

Correspondence with a missing pulse at the output of the line 91 indicates a fault condition.

The incoming code characters are sent to the

When the amplifier tube VIOB is biased so that it gives an output waveform (curve B, Fig. 9), the first counter stage FIl is triggered by the negative pulse of the amplifier tube. The second grid of a tube VlA (Fig. 4) is placed. This counter stage F12 is triggered by negative impulses of the character can be a single or double current character on the right tube part of the first counting stage. The tube VlA is conductive during the time of
Character stream and non-conductive for the duration
of the separating current. The incoming code characters are amplified by the tube VlA and vice versa 60
and given to the line 11, which to the start-stop circuit (Fig. 4) via a rectifier 6 ^ i? 6th
and leads to the grid of a tube Fl B (Fig. 5) of the tube circuit.

The tubes F14 and F15 (Fig. 4) form a positive, rectangular pulse »0«, »1«, »2«, »3«, »4«. stage multivibrator in which the tube F15 "5", "M", "H" through SR7, SR8, SR9, SR10, SRIl, is normally conductive. The reverse input - SR 12, SR13 and, ST? 14 can be generated. A positive code is applied via an amplifier to the grid. Tive pulse is applied through the rectifier SR7 to the tube F14, so that this tube produces conductive SR14 only when the three associated anodes becomes, and this triggers the multivibrator, 70 the flip-flop Tubes are positive at the same time.

The third counting stage F13 is triggered by negative pulses of the right tube section of the second counting stage triggered.

The outputs of the anode circuits of the flip-flop tubes of the binary counter are led to a matrix, which the rectifiers SR7 to 57? 14 contains. The rectifiers are interconnected and biased in such a way that

5 6

The "O" pulse is sent to the scanner via 15a and F35 as a modulator, and the grid bias

placed. potential is chosen so that the tubes are only conductive

The pulses »1« to »5« correspond to the five EIe, if a positive time counting pulse corresponds to a positive

menten a teletype code, and these impulses tive element of the output signal from the equality derived from the following impulses of the 5 rectifier SR 3 of the mixed circuit is superimposed.

Amplifier tube FlO B. These five pulses are the output signals of the mixer circuit

to the scanning device via a multiple connection to each other in opposite phase, and the

(15 & to 15 /). Tubes F 3 A and F 3 B are therefore only closed once

The "M" impulse, magnetic impulse, becomes a conductor of time. The output of each of these tubes, fed to the more powerful tube V7 , which has a switching magnet io that work as modulator tubes, has the form of

controls whose coil in the anode circuit of these negative pulses of very short duration, which

stronger tube V7 is located. corresponds to the time counting pulses. This initial

The “H” pulse, which is impulsed from the rectifier SR 14, is transmitted via lines 17 a and 17 b

stirs, has a duration of a complete cycle, eight has laid the flip-flop circuit, which the double tube

Counts, and is used as a hold pulse for the oscillator 15 V "4 contains.

gate control tube F8 (Fig. 4) is used, so that the flip-flop circuit consists of a two-M univibrator, which consists of the tubes V 14 and F15 stage, directly coupled amplifier. The power is on, can be left out. The hold pulse "H" circle has two states of rest. If it is negative, the pulse is then applied to the grid of the conductive part of the double oscillator control tube V 8 via an inverting tube on the grid. 20 tube is applied, there is a quick transition to the scanning device, which is shown schematically in the other idle state. As shown in the grid of FIG. 7, an electromechanical non-conductive triode is advised to apply negative pulses. The key strip will have no effect through a switch.

magnet SM switched forward. The first negative pulse from the anode current for the strip is not shown. The upper 25 circle of the tube VZA will cut the anode circuit of the contacts are closed for the character current elements of the left part of the double tube F 4. The and the lower contacts for isolating current elements. corresponding anode becomes positive, and a positive one. All contacts are in the character current position. The five contacts give a five element tube V 4 fed. The following negative impulses from telex code again. 3 ° the anode circuit of the tube VZA have no The impulses for the character current are with the influence, as long as the right part of the double tube "O" -pulse from the rectifier SR7 is combined conductive. The first following negative pulse from and fed to a control circuit. the tube VZB , however, the flip-flop current-The pulses for separating current will extinguish the line 16 circuit and fed to the first idle state, which lead to the control circuits. 35 bring.

The control circuit 6 (Fig. 1 to 3) is, as in this manner, the flip-Flopaus converts the Fig. 5 is apparent, of two reverse and comparison circuit, the message 2 A in the pulses of the more tubes V and V2B for the scanning signal, anode circuits of the tubes VZA and VZB enteiner amplifier tube FIi? keep for the incoming are, in direct current square-wave pulses, the signal, a mixed circuit, which corresponds to the telegraph code characters from the direct 40 and composed by the judge units 6 "i? Ij SR2 and SR 3 combination of two signals of the mixed circuit, and two amplifier or modulator tubes VZA originate. the time count is completely determined by and VZB. the start-stop oscillator, and the output of the reverse input code mark of the tube from the flip-flop circuit is therefore re-VLA is applied directly to the rectifier SR1 , 45 is established when the dotted connection 26 is in front of it, directly and also via the tube VI B. The inversion that was present in the input to the same rectifier Line 16 led on.

the tube V2A and to the rectifier SR 2. As previously explained, the amplifier output of the tube V2A is so biased via the tube V2B 50 tube VIOB of FIG. 4, also applied to the rectifier SR2 . The output that the output corresponds to curve C in FIG. 9, the mixed circuit leads to the grids. If this is the case, an initial counting pulse from the amplifier tubes VZA and F35; the outputs from the anode circuit of tube F3. 4 of these tubes lead to a flip-flop circuit, and this pulse can be controlled by a double tube F4. This flip-flop 55 circuit to the grid of the left tube of the first device is not shown in the circuit diagram 1, binary counting stage can be placed. When the Multida it is not strictly necessary. The output vibrator, which consists of the tubes F14 and F15, can be taken directly from one of the anode circuits which is switched off by the circuit and the stop amplifier tubes VZA and F3ß. impulse "H" to obtain a reversal tube to the grid For a more extended time count 60 of the oscillator control tube are placed F8, a connection 26 between the pulse source 2 and the same reverse tube as a control circuit for the control circuit 6, as shown in FIG. 3 initial counting pulses are used, which are to be established before. This connection is to be managed as a counting stage. In this case, a broken line shown in Figs. 4 and 5 generates SR7 a "1/2" pulse instead of an "O" pulse. and connects the anode circuit of the amplifier 65 The "1/2" pulse corresponds to the second half of the tube V10B and the capacitors C1 and C2 in the first teletype code element. Fig. 5, which on the grids of the tubes VZA and The curves A ₁ B and C (Fig. 9), which lie in the joint VZB. The time counting pulses are shown superimposed on the notice with the explanation of the oscillator (V10A, output signals of the mixed circuit SR1 to SRZ, FIG. 4). In this case the F3 ^ 4 70 tubes serve as the oscillator output. Curve B shows the

output of the amplifier when no initial counting pulse is desired. Curve C shows the output of the amplifier when an initial count is used. Curve D shows an unencrypted output code character and curve E shows a key code character. These characters are combined in the control circuit 6 (FIGS. 1 to 3) and result in an encrypted output code character G if no initial count pulse is used, or an encrypted output code character F if an initial count pulse has been used. The only difference between curves F and G is that the latter is delayed by a counting element which is half the size of a teleprint code element. A combination of character stream and character stream or separating stream and separating stream gives character stream and a combination of separating stream and character stream, or character stream and separating stream gives separating current, depending on the mixing circuit (SR 1 to SRS, FIG. 5).

The test circuit is shown in FIG. 10 and consists of direction-sensitive control circuits. The tube V 6, which forms part of a control circuit, is in this circuit in such a way that an associated alarm relay is normally energized. If a fault occurs, the anode current of the tube V 6 is interrupted. The associated alarm relay drops out and switches off the encryption and decryption device.

If the device is in order, the grid potential of the tube V6 is determined by the pulses that are sent to the grid of this tube via the rectifiers SR 4 a, SRAb and .ST? 5 can be placed. These impulses are all positive. The anode current of the tube will be interrupted immediately when no more positive pulse voltages arrive via the rectifier.

Positive pulse voltages across the rectifier SRAa are present between two code characters during the quiescent state and during the character stream elements. This indicates that the output of the flip-flop circuit is working properly. From the figures it can be seen that this positive pulse voltages derived from the grid circuit of the tube V 4 via the line 71 b (Fig. 5, 7 and 10). The positive pulse voltages are put together to form a continuous train of pulses, which comes from a number of individual pulses, namely the 1/2 or 0 pulses and the pulses 1, 2, 3, 4, 5 correspond to either be taken directly by the mechanically controlled contacts via the switch S in the position 1 or of the anode of the tube V2B with the switch S in position 2 and placed on the line D to the rectifier SR 4 b.

These pulses are combined with the pulses which correspond to the character stream elements and which are sent directly from the mechanically closed contacts of the scanning device (Fig. 7) via the line C and the 0 or 1/2 pulses from the rectifier SR 7 (Fig. 6 ) can be supplied via line A. These pulses are all applied to one side of the rectifier SR5 . The M-pulse from the rectifier SR 13 (FIG. 6) is conducted via the line B to the other side of the rectifier SR 5. The M-pulse can be combined in a control circuit (Fig. 7) with a pulse which indicates that the paper strip is properly forwarded in the scanner. Such a control circuit can either be mechanically controlled, as shown in Fig. 10, or it can also be photoelectrically controlled.

Reference numerals 38, 28, 18 and 71 in FIG. 3B correspond to lines A, B, C and E in FIG. 10.

Line 19 is negative when no positive pulse appears on any of lines A, C or D. If a positive pulse now also does not occur via the rectifier SRAa , the negative potential of the grid of the tube V6 becomes effective via the grid bias resistor. The tube is thus interrupted and activates the alarm relay.

If any positive pulse of the normally continuous pulse train from SR5 is lost, the anode current of tube V6 will be interrupted when the missing pulse coincides with a separating current element in the output code symbol. Such a match will normally take place within a few code characters and interrupt the transmission immediately if the fault has occurred.

Claims (6)

Patent claims: 1. Automatic testing device for the identification of faults in tubes and others Switching means of an electronic device for encrypting and decrypting telex characters using a scanning device for punched tape, which by the cooperation of a Start-stop pulse source with binary counting circuits and a matrix synchronous with the plaintext or encrypted line characters and in Depending on the start impulse this character receives impulses passing through the key strip are controlled and form a first category of telex characters, characterized in that a second category of telex characters (i.e. plain text or encrypted messages arriving on the line Characters) with their character current and separating current pulses at the same time with a pulse train, which is formed from the code elements of the first category of telex characters and by corresponding conversion consists only of character current pulses, with two additional pulses on one negatively biased grid of an electron tube act in such a way that z. B. if one fails Current step pulse in the pulse train the negative grid bias on the grid of the electron tube with the simultaneous occurrence of a separating current step in a telex code character of the second category is no longer compensated, and so is the train of impulses from a teletype character second category is checked for completeness. 2. Automatic testing device according to claim 1, characterized in that the the Code elements of the first category of telex characters corresponding pulses (15 5 to 15 /) of the Scanning device are guided in two ways to produce a pulse train of character stream pulses to be combined. 3. Automatic test device according to claim 1, characterized in that an Impnls (0 or 1/2) in the pulse train from a pulse source (rectifier SR7 of the matrix, Fig. 6) is generated in time so that it is in front of the first code element of a teletype character comes to rest in the first category. 4. Automatic test device according to claim 1, characterized in that a pulse (15g) in the pulse train from the pulse source (Rectifier M of the die, Fig. 6) appears in time when the next telex character (key) of the first category is switched on in order to be scanned. 5. Automatic test device according to claim 1, characterized in that when there is an interruption in the pulse train formed from character current elements, the electron tube (V6) of the test device has a stop 10 Device (relay in the anode line 91) controls which interrupts the transmission. 6. Automatic test device according to claim 1, characterized in that the switching means be inserted in the test circuit in the main circuit if no combination takes place (Plain text transmission) so that the stop facility is automatically checked when no combination takes place. In addition 3 sheets of drawings © 709 758/141 10.57