US3585279A - Device for recording coded pulses - Google Patents

Abstract

Device for recording coded pulses, in particular characters of a telegraphic code, comprising multivibrators corresponding to the units of the code to be identified, said multivibrators being connected to the outputs of a receiver, in particular a telegraphic code receiver, the change of state of a multivibrator causing the appearance of a polarity at one of the outputs of the device of sufficient duration to permit the control of a controlled circuit.

Description

United States Patent [72] Inventor Roger Teurnier Rueil-Malmaison, France [21] Appl. No. 786,246

[22] Filed Dec. 23, 1968 [45] Patented June 15, 1971 [73] Assignee C.I.'I.-Compagnie Industrielle Des Telecommunications Paris, France [32] Priority Dec. 22, 1967 I 33] France [54] DEVICE FOR RECORDING CODED PULSES 9 Claims, 4 Drawing Figs.

{52] U.S. CI 178/23, 178/88,178/89 [51] Int. Cl H041 3/00 178/89, 93,

[50] Field of Search...

. l7.5,88,70;3l7/l39, 140

[56] References Cited UNITED STATES PATENTS 3,294,908 12/1966 Schiebeler 178/88 3,359,368 12/1967 Kleinschmidt.... 178/89 Primary Examiner- Kathleen H. Claffy Assistant Examiner-Jon Bradford Leaheey A!t0rneyCraig and Antonelli ABSTRACT: Device for recording coded pulses, in particular characters of a telegraphic code, comprising multivibrators corresponding to the units of the code to beidentified, said multivibrators being connected to the outputs of a receiver, in particular a telegraphic code receiver, the change of state of a multivibrator causing the appearance of a polarity at one of the outputs of the device of sufficient duration to permit the control of a controlled circuit.

DEVICE FOR RECORDING CODED PULSES The present invention concerns a device for recording coded pulses, in particular characters of a telegraphic code.

In the telegraphic code receiver used in certain networks, orders corresponding to the 5 moments or units or time intervals of the code are given to memory circuits forming part ofa modulation recording device. These orders are sent in the form of pulses of milliseconds duration for each negative unit or time interval and produce the engagement of highspeed relays of a small type. Such relays, which have only a very small number of contacts, are well suited for simple recording of the modulation, but if it is desired to use them for more complicated needs, such as for example translation into decimal code, it is necessary to add to them auxiliary relays, resulting in a delay in the operation and complication of the equipment.

It is the object of the present invention to effect the engagement of relays of normal type having a large number of contacts in a system of the type described. The invention also allows the selection of a certain number of predetermined combinations in a modulation for producing, for example, a special operation.

The device according to the invention is more particularly characterized in that, associated with a receiver and utilizing the orders which appear at the outputs of the receiver, more particularly a telegraphic code receiver, it comprises multivibrators corresponding to the units or code time intervals to be identified and connected to the said outputs of the receiver such that the multivibrators are controlled successively according to the rate of the received moments, so that on reception of a moment of a certain polarity, there is no change of state of the corresponding multivibrator, and such that on reception of a code unit of opposite polarity, there is effectively a change of state of the multivibrator, the change of state causing the appearance, at one of the outputs of the device, of a polarity of sufficient duration to allow the control of the circuit considered, for example of an electromechanical relay having a large number of contacts.

According to one feature of the invention, the device permitting both recording and selection of a combination of a code having 5 moments from orders which appear at the receiver outputs comprises two monostable multivibrators, six bistable multivibrators and a transitor.

According to yet another feature of the invention, the device comprises n bistable multivibrators corresponding to n moments to be identified and twomonostable multivibrators, the first of which having a small time constant acts as a polarity distributor, while the second having a large time constant corresponds to the time necessary for the control of the circuit considered, each bistable multivibrator having its first input at a point common to three circuits, the first circuit being connected to the output of the polarity distributing multivibrator, the second circuit being connected to the test wire of the input moments, the third circuit being connected to the first gate corresponding to the first moment, and its second input being connected to one of the gates of the receiver, the device being such that during the time interval in which the first input does not receive any polarity from the different circuits, a capacitor is charged in the interior of the bistable multivibrator, the capacitor being discharged and the multivibrator changing its state as soon as the polarity returns to the first input, provided that a negative moment has been detected during the short time interval without polarity, left by the first monostable multivibrator, the multivibrator persisting in this state for a time sufficient to allow the engagement of an electromechanical relay having a large number of contacts, and returning to rest only by the gate circuit connected to its second input, this arrangement being the same for the four multivibrators detecting the four first code units of the combination.

According to yet another feature of the invention, the duration of the appearance of a polarity on one of the outputs of the bistable multivibrator of order n is limited by two instants, the first being the absence of ground potential from the gate of n'th order at the first input of the bistable multivibrator and the second being the return of earth polarity from the gate of (n+1) th order at the second input of the multivibrator, such that the total duration of the appearance of potential is equal to two code units.

According to yet another feature of the invention, the selec tion of a predetermined combination is effected by connecting one of the outputs of each bistable multivibrator, depending on the sign of the unit to be selected, to a common wire connected to the base of a transistor which, becoming thereby conductive, indicates that the selection of the predetermined combination has just been operated.

According to yet another feature of the invention, the circuitry may be simplified if it is desired to register only one input combination, five monostable multivibrators only being then necessary.

Other features of the invention will appear in the course of the following description of two embodiments of the invention given solely by way of nonrestrictive example, the features resulting from both description and drawings forming of course part of the invention. 7

FIG. 1 represents a selection and recording device according to the invention.

FIG. 2 is a diagram of the times corresponding to the operation of the device according to FIG. 1.

FIG. 3 represents a simplified modification of the device according to the invention.

FIG. 4 represents the diagram of the times corresponding to a second modification derived from FIG. 3.

In the embodiment shown in FIG. I, the telegraphic line LL is connected to a receiver R of known type not shown in detail here. The receiver R provides a certain number of outputs: L PT, P0, P1, P2, P20, P3, P3a, P4, P4a, P4b, P5, P5a, PSand P6. The receiver R, of which only certain outputs for the external orders appear, comprises, for example, a demultiplier formed of four binary multivibrators controlled by a I00 c/s oscillator, the starting of which is caused by the appearance of a negative polarity on the line. From the start of this negative polarity, the line is tested at instants corresponding to the middle of each of the units of a character; the result of this test appears at one of the outputs and persists until a fresh test detects a change of polarity. The other outputs of the receiver are gates connected to ground except during. certain welldetermined time intervals successively for the different gates, each time interval having the duration of a unit reckoned between the middles of two successive units.

From the start of a negative line pulse, the line is tested at the instants of 10, 30, 50, 70, 90, and I30 milliseconds, corresponding to the middles of the different units of code (FIG. 2). The result of the test appears at the output L as a ground potential for a positive line pulse and as nothing for a negative line pulse. The situation of the point L persists until a new test detects a change of the line polarity. The other outputs of the receiver are all gates shown symbolically by a diode, the state of which, independent of the input modulation, is shown respectively by the curves b, d, e,f, g, h,j and k of FIG. 2. The curve a represents the division of a character; the latter is formed of a negative start ST, five significant code units I, 2, 3, 4 and 5, which may be positive or negative, and a stop SP always positive. All the moments have a duration of 20 milliseconds, except the stop, which has a duration of 30 milliseconds. The cycle CR of the receiver R has a duration of milliseconds and commences at the commencement of the start.

The device according to the invention comprises two monostable multivibrators MMl and MM2, both having the same internal circuit of known type, shown in detail in the case of the multivibrator MM2, and six bistable multivibrators MB] to MB6 having all the same known internal circuit shown in detail MB]. In addition there is a transistor T, the output of which is represented by its collector.

The input E1 of the multivibrator MMl is connected to the gate PT which, according to the diagram b (FIG. 2), is either at ground potential for 10 milliseconds (top line) or at nothing (bottom line); there results at the output S1 of the multivibrator MMl, a quasi-permanent ground potential interrupted only for about 250 microseconds at the instants IO, 30, 50, 70, 90 and 110 milliseconds (curve c, FIG. 2).

The diagrams d toj in FIG. 2 give the negative polarities applied to the gates P to Pb of the receiver R. The negative polarity is applied in turn to the gates for 20 milliseconds: from the instant to the instant 30 to gate P0 (curve 11), from the instant 30 to the instant 50 to gate P1 (curve e), from the instant 50 to the instant 70 to gates P2 and P2a (curvef), from the instant 70 to the instant 90 to gates P3 and P3a (curve g), from the instant 90 to the instant 1 10 to gates P4 and P40, P4b (curve h), from the instant 1 10 to the instant 130 to gates P5, P50, P5b (curvej).

The output L of the receiver R is connected to the output S1 of the multivibrator MMl across a diode dL, and the common point A thus formed is connected in its turn across diodes d1 to 115 to each of the inputs E1 of the multivibrators MB1 to MBS. In addition, the gate P1 is connected to the input E1 of the multivibrator MB1, the gate P2 is connected to the input E1 of the multivibrator MB2, the gate P3 is connected to the input E1 of the multivibrator MB3, etc. The result is that the state of the input E1 of the multivibrator MB1 depends on the simultaneous state of the output S1 of the multivibrator MM1,

the output L and the gate P1; similarly for the inputs E of the multivibrators MB2 to MBS. The output B1 of each of the multivibrators MB1 to M85 is connected across a resistance R1 to a common point B, itself connected on the one hand to the negative polarity of a source of current across a resistance R2 and on the other hand to the gate P0. The outputs S0 of the multivibrators MB1 to MBS form respectively the outputs l, 2, 3, 4 and 5 to a recording device DE. The input E0 of the multivibrator MB1 is connected to the gate P2a, the input E0 of the multivibrator MB2 is connected to the gate P30, the input E0 of the multivibrator MB3 is connected to the gate P40, the input E0 of the multivibrator M85 is connected across a diode to the output S1 of the multivibrator MM2, the input of the latter being connected to the gate P4b.

The operation of the device just described is as follows:

Reception ofa code combination will be assumed; at the instant 0 the multivibrators MB1 to MB5 are in the condition of providing ground potential at the outputs SI. On the appearances of a line start (negative) the receiver R is started, ground potential disappears from the output L; however, there is no practical effect, since ground potential continues to be provided at the outputs S1 of the multivibrator MMI and by the gates P1 to P5. 1'

At the instant l0, triggering of the multivibrator MM1 suppresses for 250 as the ground potential at the output S1; however, again no practical effect results, since ground potential continues to be provide by the gates P1 to P5.

At the instant 30, middle of the first code unit, triggering of the multivibrator MMl (no ground potential at the output S1 for 250 ps) coincides with the suppression of ground potential at the gate P1. However, if the unit tested is positive, there is ground potential at the output L and consequently no practical effect results, ground potential continuing to be applied to the input E1 to each multivibrator MB1 to M135; but if the unit tested is negative, there is no longer ground potential at the input E1 of the multivibrator MB1 from gate P1 or outputs S1 and L and the capacitor C1 is charged between the negative polarity of the collector of the transistor T82 and the base of the transistor T81 When the ground potential from the output S1 of the multivibrator MM] reappears at the input E1 of the multivibrator MB1, the latter changes state, the transistor which was conductive is blocked and the transistor T82 which was blocked becomes conductive. The ground potential thus disappears from the output S1 to appear at the output S0.

At the instant 50 (middle of the second moment), ground potential is given again by the gate P1 to the input E1 of the multivibrator MB1; the ground potential is suppressed for 250 microseconds at the output S1 of the multivibrator MMI. There is, therefore, no effect on the multivibrator MB1, but on the contrary there is at the input E1 of the multivibrator MB2 an operation identical with that just seen for the instant 30 at the input E1 of the multivibrator MB1. Therefore, if the code unit tested is negative, the multivibrator M82 changes state; the ground potential disappears from the output S1 of the multivibrator MB2. However, the ground applied by the gate P241 to the input E0 of the multivibrator MB1 has disappeared at the same time as the ground potential applied by the gate P2 to the input E1 of the multivibrator (see curvef, FIG. 2); consequently, the capacitor C2 of the multivibrator MB is charged between the negative polarity of the output S1 and the base of the transistor TB2.

This state is maintained until the instant 70. At the instant 70, a ground potential is reapplied by the gate PM to the input E0 of the multivibrator MB1 which produces a change of state of the multivibrator MB1; the ground which was at the output S0 is suppressed and is restored at the output S1.

From what has just been seen, it is possible to deduce that a positive unit does not apply ground potential to the output S0 of the multivibrator MB1, whereas a negative unit applies ground to the output S0 for 40 milliseconds (see curve m, FIG. 2). It should be noted that the multivibrator MB1 had made its first change of state only at the instant 30 ms. 250 #s; the duration of ground potential at the output S0 is therefore actually slightly less than 40 ms. The outputs S0 therefore permit the engagement of ordinary relays having several contacts; these relays being situated in the recording device DE and being capable of having a holding winding reflect the polarity of the different units of a character, an engaged relay corresponding to a negative unit and a relay at rest to a positive unit.

The operation is identical for the units 2, 3 and 4 corresponding to the multivibrators M82, M83 and M84. With regard to the multivibrator MB5, the operation is quite analogous to that of the multivibrator MB1 for the first change of state obtained by the input E1. For the second change of state obtained by the input E0, the operation is different, because there are no longer any gates such as P211, P3a, P4a, PSa connected to the respective inputs of the multivibrators MB1 to MB4, since the cycle CR of the receiver terminates at milliseconds. The ground potential of the gate P4b is maintained at the input E1 of the multivibrator MM2 up to the instant 90 (see curve h, FIG. 2). At this instant, suppression of ground potential permits charging of the capacitor C3. At the instant 110, when ground returns via the gate P4b, there is a change of state of the multivibrator MM2 that is to say, ground potential S1 of the multivibrator MM2 is suppressed and ground potential appears at the output S0 of the multivibrator MM2 (curvef, FIG. 2). For 40 milliseconds, corresponding to the time constant of the multivibrator MM2, the input E0 of the multivibrator MB5 no longer receives ground potential. After this time, that is to say at the instant ms., the multivibrator MM2 again changes state; ground potential is restored to the output S1 of the multivibrator MM2 an suppressed at the output S0. The input E0 of the multivibrator MB5, again receiving ground potential, produces the change of state of the multivibrator MBS which returns to the resting position.

When several characters have to be recorded, it is necessary to have a distributor synchronized with the operation of the receiver; this synchronization may be obtained by means of a circuit identical with that controlling the multivibrator MBS but not connected to L since it does not depend on the nature of the input units.

The circuit according to FIG. 1 also permits selection of certain combinations of a telegraphic modulation. For this purpose, it is merely necessary to provide the circuits shown in dashed lines and to connect ground to the wire N; the latter is connected to all the inputs E0 of the multivibrators MB1 to MBS which are then kept constantly at ground lever. Each multivibrator MB! to MBS having changed state by its input EI can no longer revert to rest by its input E at the end of 40 milliseconds.

For selecting a given combination comprising, for example, positive units and negative units, it is merely necessary to connect, across diodes D1 to D5, to a common wire the outputs S0 or $1 of the five multivibrators MBI to MBS; for a positive unit of order n1 the common wire is connected to the output S0 of the multivibrator of order n corresponding to the said unit, and for a negative unit the common wire is connected to the output S1. The common wire is connected to the base ofa type PNP transistor, the base being negatively biased at rest; under these conditions the transistor is conductive only if no ground potential arrives at the common wire, which is the case for the selected combination. It will be assumed, for example, that it is desired to detect the sign combination (often used as the end of a numbering signal); this combination being following: will correspond to a common wire connected to S0 ofMBl, Sl ofMBZ, S1ofMB3, SI ofMB4 and S0 of MBS as indicated in FIG. 1. When this combination is received by the multivibrators MBl to MBS, the ground potentials from the outputs S0 and S1 appear at the outputs opposite to those connected to the common wire: there is, therefore, no ground potential on the common wire for the selected combination and consequently the transistor T could become conductive. However, the common wire is also connected across the diode D6 to the output 81 of a bistable multivibrator MB6, the operation of which is analogous to that of the multivibrator MBI; there is, therefore, ground potential at the output S1 of the multivibrator M86 owing to the gate P5b up to the instant 130 ms.

From the instant 130 ms., therefore, the transistor T becomes conductive. Ground potential at the output S1 of the multivibrator MB6 will only reappear at the instant 10 of the next cycle by the gate P6 (curve k, FIG. 2). Therefore, for two consecutive combinations transmitted in the 150 ms. cycle, interruption of ground potential at the output S1 of the multivibrator MB6, during which the transistor T is conductive, is at least equal to 40 ms. The order given to the collector of the transistor T, therefore, indicates that the combination which had to be selected has just been received by the receiver R.

According to requirements, any code combination may be selected by the same process as that just described for the combination. Between the instants l0 and of each cycle, that is to say, before recording of the first moment, the multivibrators are put in the resting position by P0.

The curves m to q of FIG. 2 give the change of state of the five multivibrators MBI to MBS in the course of one cycle. It will be seen that earth polarity is applied in turn to the outputs S0 with a displacement of 250 microseconds relative to the middle of each of the five units and that there remains approximately milliseconds, provided the units are negative. The return to rest of the entire device is ensured before the reception of the next character by the circuit connecting the point B to the input B1 of each multivibrator, the resistance R2 not being short-circuited by the gate P0 between the instants l0 and 30.

Modification I When the selection of certain code combinations is not contemplated, a simpler circuit according to that of FIG. 3 may be used.

In this case, the bistable multivibrators MBl to MBS are replaced by monostable multivibrators M1 to M5, the unstable period of which is selected in accordance with the recording circuit to be controlled (40 milliseconds, for example), and only the monostable multivibrator MMl is retained. The outputs of the receiver R are limited to L, PT, P1, P2, P3, P4 and PS, the line arriving at L.

The circuits applied to the inputs E1 of the different multivibrators M1 to M5 are exactly the same as in FIG. I for application to the inputs of the multivibrators MBI to MES.

Here, only the outputs S0 are connected to the recording devices DE, the outputs Sl are not used; the gate PT and the output S1 of the multivibrator MMl provide the same signals as in the preceding case (curves b and c, FIG. 2); likewise, the gates P1 to P5 also operate as previously described (curves e to j, FIG. 2).

At the input E1 of the multivibrator M1, at the instant 30 ms. and during 250 microseconds, ground potential is found if the first unit is positive and nothing if the first unit is negative. In this latter case, the multivibrator MI is triggered and a ground potential appears for 40 milliseconds at the output S0 of the multivibrator M1.

The periods of operation of the multivibrators M1 to M5 are the same as those indicated in the diagram (curves m to q, FIG. 2) for the multivibrators MBl to MB5.

Modification 2 The circuit may be simplified still further by eliminating the multivibrator MM]; The gate PT is also eliminated and input E1 is subjected only to two conditions carried into effect by the wire L and the wire of the corresponding gate. Thus, the

input E1 of the multivibrator M1 is connected to the wire L and to the gate P1, the input E1 of the multivibrator M2 is connected to the wire L and to the gate P2, etc,

When ground potential is suppressed at the gate Pl, the capacitor of M1 (such as C3 of MM2, FIG. 1) is charged, but the change of state (unstable period) only takes place during the discharge of the capacitor caused by the reappearance of ground potential at the gate Pl at instant 30.

The change of state, therefore, occurs with a delay of 20 as compared with the circuits according to FIGS. 1 and 3. The waveform diagrams relating to the modification 2 are illustrated in FIG. 4, references r to v corresponding to the multivibrators M1 to M5.

It will be noted that the multivibrator M5 remains in the triggered state for 20 ms. after the instant (end of signal); this is of no importance for the reception, since the multivibrator M1 will be triggered in the following cycle only at the instant 50.

It will obviously remain within the scope of the invention if the latter is extended to the detection and recording of a code having more or less than 5 moments, or by the use of transistors of a type opposite to that described herein or by the reversal of the polarities which have been given at the gates and outputs of the receiver or generally by the use of means equivalent to those which have been specified.

Iclaim:

l. Coded pulse recording device associated with a telegraphic code receiver, having means responsive to a predetermined input code combination and permitting the recording of any code combination on electromechanical relays having a large number of contacts, characterized in that the device, utilizing signals appearing at the outputs of the receiver, comprises multivibrators corresponding to the code time intervals to be identified and connected to the said outputs of the receiver such that the multivibrators are controlled successively according to the rate of the code time intervals received in a manner such that on reception ofa code time interval of a certain polarity there is no change of state of the corresponding multivibrator, and such that on the reception of a code time interval of opposite polarity, there is a change of state of said multivibrator, the change of state causing the appearance of a polarity signal at one of the outputs of the device of sufficient duration to permit the control of an electromechanical relay having a great number of contacts, and the disappearance of the polarity being caused by a change of state of the multivibrator.

2. Device according to claim 1 and further including control means connected to each multivibrator for permitting a change in state thereof only at the center of a respective code time interval.

3. Device according to claim 2 wherein said control means includes a monostable multivibrator, said receiver providing a second output having a frequency equal to twice the frequency of the received code time intervals connected to said monostable multivibrator in control thereof, said monostable multivibrator having a very short conduction time.

4. Coded pulse recording device for the recording of any code combination having n code units from a telegraphic code receiver including demultiplier means for polarity testing the different code units of the combination and a plurality of gates rendered successively conductive at definite instants, comprising n bistable multivibrators corresponding respectively to the n code units to be identified and first and second monostable multivibrators, said first monostable multivibrators having a small time constant and serving as a polarity distributor. said second monostable multivibrator having a large time constant, providing a signal having a duration which corresponds to the time necessary for the control of the circuit considered, each bistable multivibrator having a first input connected to a point common to three circuits, the first circuit connecting the bistable multivibrator to the output of the polarity distributing multivibrator, the second circuit connecting the bistable multivibrator to the output of said demultiplier means, and the third circuit connecting the bistable multivibrator to a gate corresponding to the respective code units associated with the given bistable multivibrator, and its second input being connected to a first gate of the receiver which initially resets the multivibrator each bistable multivibrator including a capacitor which charges during a time interval in which the first input received no polarity signal from said three circuits, said capacitor being discharged and the multivibrator changing state in response to return of the polarity signal to the first input along with detection of a negative code units during the time interval when no polarity signal is provided by the first monostable multivibrator, a bistable multivibrator persisting in this state for a time sufficient to permit the engagement of an electromechanical relay having a large number of contacts, and only returning to rest in response to control provided by the gate circuit connected to its second input, this arrangement being the same for the n-l multivibrators detecting the first n-l code units of the combination,

5. Device according to claim 4, characterized in that, for the detection of the nth code unit of the combination, it comprises an additional bistable multivibrator identical with the bistable multivibrators detecting the n-l code units, but in which the second input of the nth multivibrator is connected to the first output of the second monostable multivibrator having a large time constant, the latter multivibrator having changed state at the same time that the nth bistable multivibrator made its first change of state, and the return to rest of the second monostable multivibrator causing the return to rest of the nth bistable multivibrator.

6. Device according to claim 4, characterized in that the three circuits connected to the first input of each bistable multivibrator are such that the first circuit serves as means for providing a short interruption of positive polarity in the middie of each input code unit, the second circuit serves as a means for providing a given polarity on a test of positive code unit only and the third circuit connected to the output of the gate corresponding to the moment explored provides a permanent positive polarity except during the period corresponding to the time interval separating the middles of two consecutive code units, that the first input of each bistable multivibrator does not receive any polarity during said short interruption if the explored moment is negative, and continues to receive a positive polarity if the code unit explored is positive.

7. Device according to claim 1, characterized in that the selection of any predetermined code combination having five code time intervals is obtained by a device comprising five bistable multivibrators and in addition a sixth bistable multivibrator and a transistor, the base of which is connected to a common wire, to which are connected the outputs of the five bistable multivibrators, means for applying a blockin polarity signal to the second input of the five multivibrators or maintaining them in their first change of state condition and to the output of the sixth bistable multivibrator, such that no blocking polarity signal arrives at the transistor when it is a matter of the code combination selected from the last received instant and during at least 30 milliseconds.

8. Coded pulse recording device for recording of a telegraphic code combination of code units from a telegraphic code receiver including demultiplier means for a polarity testing the different code units of the the combination and a plurality of gates rendered successively conductive at definite instants, comprising five monostable multivibrators, the unstable period of which is selected according to the recording circuit to be controlled, and another monostable multivibrator having a small time constant and acting as polarity distributor, each monostable multivibrator having its input connected to the common point of three circuits: the first circuit connecting the common point to the output of the multivibrator acting as distributor, the second circuit connecting the common point to said demultiplier means, and the third circuit connecting the common point to a first gate corresponding to the first code time interval, the device being such that at the middle of the first code time interval explored no polarity signal is applied to the input of the monostable multivibrator during a time interval sufficient to produce its triggering provided the moment received is negative, the multivibrator not triggering if the first code time interval is positive, triggering of the multivibrator causing a polarity signal to appear at its output for a time sufficient to permit the control of the circuit and all the multivibrators triggering successively at the commencement of the explored moment if the said code time interval is negative.

9. Coded pulse recording device for recording of a telegraphic code combination of code time intervals from a telegraphic code receiver including demultiplier means for polarity testing the different code time intervals of the combination and a plurality of gates rendered successively conductive at definite instants, comprising five monostable multivibrators, the unstable period of which is selected according to the recording circuit to be controlled, each monostable multivibrator having its input connected to the common point of two circuits; the first circuit connecting the common point to said demultiplier means, and the second circuit connecting the common point to a first gate corresponding to the first code time interval, triggering the multivibrator taking place only after the lapse of a time interval in the absence of a polarity signal given by the gate connected thereto, reappearance of the polarity signal at the gate causing the triggering of the multivibrator provided the tested moment is negative and all the multivibrators triggering thus successively at the instant at which a polarity signal reappears at the gate to which they are connected, provided the code time interval explored is negative, the triggering time being sufficient to permit the control of the circuit considered.

Claims (9)

1. Coded pulse recording device associated with a telegraphic code receiver, having means responsive to a predetermined input code combination and permitting the recording of any code combination on electromechanical relays having a large number of contacts, characterized in that the device, utilizing signals appearing at the outputs of the receiver, comprises multivibrators corresponding to the code time intervals to be identified and connected to the said outputs of the receiver such that the multivibrators are controlled successively according to the rate of the code time intervals received in a manner such that on reception of a code time interval of a certain polarity there is no change of state of the corresponding multivibrator, and such that on the reception of a code time interval of opposite polarity, there is a change of state of said multivibrator, the change of state causing the appearance of a polarity signal at one of the outputs of the device of sufficient duration to permit the control of an electromechanical relay having a great number of contacts, and the disappearance of the polarity being caused by a change of state of the multivibrator.

2. Device according to claim 1 and further including control means connected to each multivibrator for permitting a change in state thereof only at the center of a respective code time interval.

3. Device according to claim 2 wherein said control means includes a monostable multivibrator, said receiver providing a second output having a frequency equal to twice the frequency of the received code time intervals connected to said monostable multivibrator in control thereof, said monostable multivibrator having a very short conduction time.

4. Coded pulse recording device for the recording of any code combination having n code units from a telegraphic code receiver including demultiplier means for polarity testing the different code units of the combination and a plurality of gates rendered successively conductive at definite instants, comprising n bistable multivibrators corresponding respectively to the n code units to be identified aNd first and second monostable multivibrators, said first monostable multivibrators having a small time constant and serving as a polarity distributor, said second monostable multivibrator having a large time constant, providing a signal having a duration which corresponds to the time necessary for the control of the circuit considered, each bistable multivibrator having a first input connected to a point common to three circuits, the first circuit connecting the bistable multivibrator to the output of the polarity distributing multivibrator, the second circuit connecting the bistable multivibrator to the output of said demultiplier means, and the third circuit connecting the bistable multivibrator to a gate corresponding to the respective code units associated with the given bistable multivibrator, and its second input being connected to a first gate of the receiver which initially resets the multivibrator each bistable multivibrator including a capacitor which charges during a time interval in which the first input received no polarity signal from said three circuits, said capacitor being discharged and the multivibrator changing state in response to return of the polarity signal to the first input along with detection of a negative code units during the time interval when no polarity signal is provided by the first monostable multivibrator, a bistable multivibrator persisting in this state for a time sufficient to permit the engagement of an electromechanical relay having a large number of contacts, and only returning to rest in response to control provided by the gate circuit connected to its second input, this arrangement being the same for the n-1 multivibrators detecting the first n-1 code units of the combination.

5. Device according to claim 4, characterized in that, for the detection of the nth code unit of the combination, it comprises an additional bistable multivibrator identical with the bistable multivibrators detecting the n-1 code units, but in which the second input of the nth multivibrator is connected to the first output of the second monostable multivibrator having a large time constant, the latter multivibrator having changed state at the same time that the nth bistable multivibrator made its first change of state, and the return to rest of the second monostable multivibrator causing the return to rest of the nth bistable multivibrator.

6. Device according to claim 4, characterized in that the three circuits connected to the first input of each bistable multivibrator are such that the first circuit serves as means for providing a short interruption of positive polarity in the middle of each input code unit, the second circuit serves as a means for providing a given polarity on a test of positive code unit only and the third circuit connected to the output of the gate corresponding to the moment explored provides a permanent positive polarity except during the period corresponding to the time interval separating the middles of two consecutive code units, that the first input of each bistable multivibrator does not receive any polarity during said short interruption if the explored moment is negative, and continues to receive a positive polarity if the code unit explored is positive.

7. Device according to claim 1, characterized in that the selection of any predetermined code combination having five code time intervals is obtained by a device comprising five bistable multivibrators and in addition a sixth bistable multivibrator and a transistor, the base of which is connected to a common wire, to which are connected the outputs of the five bistable multivibrators, means for applying a blocking polarity signal to the second input of the five multivibrators for maintaining them in their first change of state condition and to the output of the sixth bistable multivibrator, such that no blocking polarity signal arrives at the transistor when it is a matter of the code combination selected frOm the last received instant and during at least 30 milliseconds.

8. Coded pulse recording device for recording of a telegraphic code combination of code units from a telegraphic code receiver including demultiplier means for a polarity testing the different code units of the the combination and a plurality of gates rendered successively conductive at definite instants, comprising five monostable multivibrators, the unstable period of which is selected according to the recording circuit to be controlled, and another monostable multivibrator having a small time constant and acting as polarity distributor, each monostable multivibrator having its input connected to the common point of three circuits: the first circuit connecting the common point to the output of the multivibrator acting as distributor, the second circuit connecting the common point to said demultiplier means, and the third circuit connecting the common point to a first gate corresponding to the first code time interval, the device being such that at the middle of the first code time interval explored no polarity signal is applied to the input of the monostable multivibrator during a time interval sufficient to produce its triggering provided the moment received is negative, the multivibrator not triggering if the first code time interval is positive, triggering of the multivibrator causing a polarity signal to appear at its output for a time sufficient to permit the control of the circuit and all the multivibrators triggering successively at the commencement of the explored moment if the said code time interval is negative.

9. Coded pulse recording device for recording of a telegraphic code combination of code time intervals from a telegraphic code receiver including demultiplier means for polarity testing the different code time intervals of the combination and a plurality of gates rendered successively conductive at definite instants, comprising five monostable multivibrators, the unstable period of which is selected according to the recording circuit to be controlled, each monostable multivibrator having its input connected to the common point of two circuits; the first circuit connecting the common point to said demultiplier means, and the second circuit connecting the common point to a first gate corresponding to the first code time interval, triggering the multivibrator taking place only after the lapse of a time interval in the absence of a polarity signal given by the gate connected thereto, reappearance of the polarity signal at the gate causing the triggering of the multivibrator provided the tested moment is negative and all the multivibrators triggering thus successively at the instant at which a polarity signal reappears at the gate to which they are connected, provided the code time interval explored is negative, the triggering time being sufficient to permit the control of the circuit considered.

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