DE482959C - Device to prevent eavesdropping as well as for multiple traffic for telegraphy and telephony - Google Patents
Device to prevent eavesdropping as well as for multiple traffic for telegraphy and telephonyInfo
- Publication number
- DE482959C DE482959C DEK85748D DEK0085748D DE482959C DE 482959 C DE482959 C DE 482959C DE K85748 D DEK85748 D DE K85748D DE K0085748 D DEK0085748 D DE K0085748D DE 482959 C DE482959 C DE 482959C
- Authority
- DE
- Germany
- Prior art keywords
- distributor
- currents
- telegraphy
- well
- telephony
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/04—Distributors combined with modulators or demodulators
- H04J3/042—Distributors with electron or gas discharge tubes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/005—Control of transmission; Equalising
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/04—Distributors combined with modulators or demodulators
- H04J3/045—Distributors with CRT
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
Einrichtung zur Verhinderung des Mithörens sowie zum Vielfachverkehr für Telegraphie und Telephonie Die vorliegendeErfindung betrifft eine weitere Durchbildung des Erfindungsgedankens, der in dem Patent 398 789 behandelt ist, und zwar soll das dort dargestellte Verfahren auch für die Zwecke der Drahttelegraphie und Telephonie angewendet werden. Es sind hierbei gleichfalls an der Sende- und Empfangsstelle je ein Verteiler vorhanden, die in synchroner Bewegung erhalten werden und bei denen an den Gittern des Sende- bzw. an den Anoden des Empfangsverteilers jeweils die dazugehörigen Stationen liegen. Die synchrone Bewegung im Sende- und Empfangsverteiler kann hierbei in ähnlicher Weise durch einen Schwingungskreis erzeugt werden wie bei dem Hauptpatent, wobei diese Schwingung durch dieselbe Leitung übertragen wird. Ein Ausführungsbeispiel, das durch die gegebenen Abbildungen erläutert werden soll, möge zur Veranschaulichung des Erfindungsgedankens dienen.Device to prevent eavesdropping and multiple traffic for telegraphy and telephony The present invention relates to a further development of the concept of the invention, which is dealt with in the patent 398,789, namely should the procedure presented there also for the purposes of wire telegraphy and telephony be applied. They are also at the sending and receiving points a distributor each available, which are maintained in synchronous movement and where on the grids of the transmission distributor and on the anodes of the reception distributor, respectively associated stations are located. The synchronous movement in the send and receive distributor can be generated in a similar way by an oscillating circuit as in the main patent, this vibration being transmitted through the same line. An embodiment that is to be explained by the given figures, may serve to illustrate the idea of the invention.
I und II sind die beiden Zweige einer Fernleitung, a und b zwei Relais, z. B. Telephon-oder Telegraphenapparate, und c eine Stromquelle, die den Steuerwechselstrom für die masselosen Umschalter oder Verteiler liefert. Der Einfachheit halber sind an Stelle von vielteiligen Verteilern nur zweiteilige Verteiler gezeichnet, und zwar stellt Abb. z einen solchen mit transversaler Steuerung durch Ablenkspule dar, während in Abb. 2 ein Verteiler mit Steuerung durch Steuerelektroden (Gitter) veranschaulicht ist. Parallel zum Verteiler liegt an der Leitung eine hochohmige Drossel oder 'ein Widerstand, in dessen neutralen Punkt der Steuerstrom zugeführt wird. Die Stromquelle für den Steuerwechselstrom kann auf der Sende- oder auf der Empfangsseite angeordnet werden. Da auf diese Weise sowohl Empfangs- wie Sendeverteiler durch denselben Steuerstrom beeinflußt werden, müssen sie zwangsläufig synchron arbeiten. Mit einer derartigen Anordnung läßt sich ein Vielfachsprechen auf einer Doppelleitung erzielen, wobei gegenüber den bekannten Anordnungen mit abgestimmten leitungsgerichteten Wellen der Vorteil besteht, daß ein einfacher eingeschalteter Zwischenverstärker zur Verstärkung sämtlicher Sprechströme genügt.I and II are the two branches of a trunk line, a and b are two relays, e.g. B. telephone or telegraph apparatus, and c a power source which supplies the control alternating current for the massless changeover switch or distributor. For the sake of simplicity, only two-part distributors are shown instead of multi-part distributors, namely Fig. Z shows one with transverse control by means of a deflection coil, while Fig. 2 shows a distributor with control by control electrodes (grid). In parallel to the distributor, there is a high-ohmic choke or resistor on the line, in whose neutral point the control current is fed. The power source for the control alternating current can be arranged on the transmitting or on the receiving side. Since both receive and transmit distributors are influenced by the same control current in this way, they must inevitably work synchronously. With such an arrangement, multiple speech can be achieved on a double line, the advantage over the known arrangements with tuned line-directed waves that a simple switched-on intermediate amplifier is sufficient to amplify all speech currents.
Außerdem gewährt eine derartige Anordnung eine hohe Sicherheit gegen Abhören durch Induktionsströme oder Erdströme.In addition, such an arrangement ensures a high level of security against Eavesdropping through induction currents or earth currents.
Claims (2)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK85748D DE482959C (en) | 1923-03-03 | 1923-04-21 | Device to prevent eavesdropping as well as for multiple traffic for telegraphy and telephony |
FR578967D FR578967A (en) | 1923-03-03 | 1924-02-29 | Switching device for telegraphy and telephony |
CH109032D CH109032A (en) | 1923-03-03 | 1924-03-03 | Switching device for telegraphy and telephony. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK85159D DE398789C (en) | 1923-03-03 | 1923-03-03 | Method and device for preventing eavesdropping on telephone and telegraph traffic by means of electrical waves and for multiple traffic by means of electromagnetic waves |
DEK85748D DE482959C (en) | 1923-03-03 | 1923-04-21 | Device to prevent eavesdropping as well as for multiple traffic for telegraphy and telephony |
Publications (1)
Publication Number | Publication Date |
---|---|
DE482959C true DE482959C (en) | 1929-09-24 |
Family
ID=33030662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEK85748D Expired DE482959C (en) | 1923-03-03 | 1923-04-21 | Device to prevent eavesdropping as well as for multiple traffic for telegraphy and telephony |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE482959C (en) |
-
1923
- 1923-04-21 DE DEK85748D patent/DE482959C/en not_active Expired
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