DE1083324B - Circuit arrangement for the reception of a code character - Google Patents

Description

German

The invention relates to a circuit arrangement for the reception of a code character in telecommunication and remote control systems in which a code character consisting of a plurality of pulses is a relay chain controls, which forms a tax code after passing through its switching steps.

Such arrangements are intended to prevent a connection in telecommunications systems due to interference signals will be produced. For this purpose it is known to use pulse receivers in a receiving device, their response depends on a code symbol consisting of a series of pulses.

Known devices of this type have the disadvantage that the pulses and the pulse pauses of the code character are uniform, d. H. that both the pulses and the pulse pauses have the same duration. When using a code symbol with a small number of pulses, there is therefore the Disadvantage that this is simulated by glitches. For sufficient differentiation of the code characters of interference characters, which can occur in numerous combinations, it is necessary that the Code character consists of a longer series of pulses. The evaluation of the code character therefore requires several receiving switching means, the actuation of which takes a long time to complete.

These disadvantages of known devices are avoided by according to the invention the pulses of the Control a contact with the code character, which releases a relay with a delay at the first impulse Contact a second relay responds, which through a contact the response circuit for another drop-off delayed Relay prepared, the drop-out delay of the actuated by the first pulse second relay lasts longer than the next pulse pause, so that the next relay Pulse responds with a delay via the pulse contact and the contacts of the previously operated relays and prepared by a contact the circuit for the formation of the control code, wherein the The drop-out delay of this relay lasts longer than the second pulse of the pulse train, so that via the pulse contact an identification relay is energized in the rest position.

Such a measure offers the possibility that a receiving device consisting of a few switching means can be set to a code character that consists of only two pulses. Since the impulses and the pulse pause can be set to the desired duration, there is a sufficient difference compared to Interference pulses of all kinds. The code character is evaluated briefly.

The figure shows an embodiment of the invention. The Kon circuit arrangement controlled by the code character for receiving a code character

Applicant:

Telefunken G. mb H.,
Berlin NW 87, Sickingenstr. 71

Dipl.-Ing, Edmund Baranowski, Backnang,
has been named as the inventor

clock e is arranged in a code receiver Ce . In the idle state, the relay H is energized in the circuit:

Earth, contact e, winding H _{i &} , resistance Wi ₆ , negative pole of the battery.

In addition to the pull-in winding, the relay H _{has a counter winding H 65} , which in the energized state of the

Relay H "is short-circuited" via the contact h ' and the controllable resistor Wi _2. This short-circuited winding causes a drop-out delay that can be set as desired by means of the resistor Wi _2. At '! When the first code pulse arrives, contact e goes into the working position and interrupts the holding circuit of relay H. This first code pulse lasts for the release time of relay H and releases it, while interference pulses of shorter duration do not cause relay H to release. When contact h "reaches its rest position, relay H _{1 is} energized in the circuit:

Earth, contacts, contact k, contact h ", windings of relay H ₁ , negative pole of the battery.

The contact H ₁ short-circuits the first winding of the relay H ₁ via the controllable resistor Wi ₃ and makes it drop-out delayed. The contact It ₁ " prepares the circuit for the relay /. The first code pulse is followed by a pulse pause, which causes the contact e to return to the rest position. As a result, the relay H is re-energized via its pull-in winding H _12. Parallel to the pull-in winding is now connected across the variable resistor Wi _1, the counter-wound H _65. this counter-winding causes an arbitrarily adjustable by the resistance Wi ₁ within certain limits on delay. the pulse interval survived this oN delay and leaves via the contact e again address the relay H. then follows the second Code pulse which denotes the

009 530/355

Contact e brings it back to work. The contacts h " and It ₁ ' are still in their working position, since the relays H and H _{1 have a} drop-out delay.

Earth, contact e, contact k, contact h ", contact Ji ₁ ", winding Ι _1Ά , of the relay /, resistance Wi ₁ , negative pole of the battery.

Parallel to the pull-in winding J _{12 of} the relay / a counter-winding Z _{56 is} connected via the controllable resistor Wi ^ , which causes the relay to respond with a delay. The delay time is set by the resistor Wi ₁ so that it is shorter than the second code pulse. A shorter pulse can not excite the relay I , just as the interpulse period between the first and the second pulse must be of precisely limited duration in order for the relay / to respond. If the pulse pause is too short, the delayed relay H cannot respond via contact e, which is in the rest position. However, if the pulse pause is so long that it, together with the release time of relay H, outlasts the release time of relay H ₁ , it will drop out. Thus, the contacts h " and U ₁ " can only assume their working position if the pulse pause of the code character is of limited duration.

After the relay I has responded, the winding J _{56 is} short-circuited via the controllable resistor Wi _{5 through the contact 1 '.} This gives the relay / a drop -out delay that can be set _{by the resistor Wi 5.} After the end of the second pulse, since contact e is again in the rest position, the remanence relay K is switched on via contact 1 "of the drop-out delayed relay /. This means that relay K can respond in the circuit:

Earth, contact e, contact 1 ", relay K, negative pole of the battery.

The response of the relay K depends on the duration of the second code pulse. If this pulse is too long, the contact e in the working position causes the relay H ' to drop out after the drop-out delay time has elapsed. Thus, the contact h " interrupts the circuit for the relay I, whose contact 1" switches off the circuit for the relay K.

After the relay K has been switched on , its armature remains in the working position due to the effect of the remanent magnetism, whereby the tax code is formed.

Claims (2)

PATENT CLAIMS: 1. Circuit arrangement for the reception of a code character in telecommunications and remote control systems, in which a code character consisting of several pulses controls a relay chain which, after passing through its switching stages, forms a control code, characterized in that the pulses of the code character control a contact (s) , which releases a relay (H) with a delay at the first impulse, through whose contact (h ") a relay (H ₁ ) responds, which through a contact Qi ₁ ") prepares the response circuit for another relay (/) with a delayed release, whereby the drop-out delay of the relay (H ₁ ) actuated by the first pulse lasts longer than the subsequent pulse pause, so that the further relay (7) on the next pulse via the pulse contact (e) and the contacts (h ", H ₁ ") of the previously operated relay (H, H ₁ ) responds with a delay and prepares the circuit for the formation of the control code through a contact (1 "), the drop-out delay di eses relay (J) lasts longer than the second pulse of the pulse train, so that an identification relay (K) is excited via the pulse contact (e) in the rest position. 2. Arrangement according to claim 1, characterized in that that the windings of the chain relays variable resistances in series and parallel connection assigned. 40 Publications considered:
U.S. Patent No. 2,430,284. 1 sheet of drawings & 009 530/355 6.60