DE551174C - Circuit arrangement for the simultaneous connection of several participants - Google Patents

Circuit arrangement for the simultaneous connection of several participants

Info

Publication number
DE551174C
DE551174C DEA57925D DEA0057925D DE551174C DE 551174 C DE551174 C DE 551174C DE A57925 D DEA57925 D DE A57925D DE A0057925 D DEA0057925 D DE A0057925D DE 551174 C DE551174 C DE 551174C
Authority
DE
Germany
Prior art keywords
circuit arrangement
lines
simultaneous connection
several participants
participants
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
Application number
DEA57925D
Other languages
German (de)
Inventor
Dr Hans Busch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AEG AG
Original Assignee
AEG AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AEG AG filed Critical AEG AG
Priority to DEA57925D priority Critical patent/DE551174C/en
Application granted granted Critical
Publication of DE551174C publication Critical patent/DE551174C/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/42Systems providing special services or facilities to subscribers
    • H04M3/56Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Description

Schaltungsanordnung zur gleichzeitigen Verbindung mehrerer Teilnehmer Die Erfindung bezieht sich auf eine Schaltungsanordnung, welche es ermöglicht, daß eine beliebige Anzahl von Teilnehmern gleichzeitig miteinander telephonisch verkehren können. Solche Verbindungen bezeichnet man mit Konferenztelephonieanlagen. Die Abb. r zeigt eine solche Anordnung. Die einzelnen Doppelleitungen kommen von den Teilnehmern, welche alle gleichzeitig miteinander verbunden sein sollen. Das Aggregat S, welches diese Verbindung bewerkstelligt, ist nur schematisch angedeutet.Circuit arrangement for the simultaneous connection of several participants The invention relates to a circuit arrangement which makes it possible that any number of participants can communicate with each other by telephone at the same time can. Such connections are called conference telephony systems. Fig. r shows such an arrangement. The individual double lines come from the participants, which should all be connected to each other at the same time. The aggregate S, which this connection accomplished is only indicated schematically.

An ein solches Aggregat muß nun die Bedingung gestellt werden, daß es von jeder Anschlußseite aus gesehen den Wellenwiderstand der betreffenden anzuschließenden Leitung hat. Diese Forderung muß unbedingt erfüllt sein, da sonst ein Verstärkerbetrieb, der genau angepaßte Wellenwiderstände erfordert, unmöglich wäre. Ferner muß gefordert werden, daß diese Anpassung stets richtig ist, unabhängig davon, ob an dem für it Teilnehmer eingerichteten Aggregat alle n Anschlüsse belegt sind oder nicht.The condition must now be placed on such an aggregate that it shows the characteristic impedance of the respective connection side, as seen from each connection side Management has. This requirement must be met, otherwise an amplifier operation, which requires precisely matched wave resistances would be impossible. It must also be required be sure that this adjustment is always correct, regardless of whether the for it Subscriber set up aggregate all n connections are occupied or not.

Zu diesem Zweck ist bereits vorgeschlagen worden, aus 7t gleichen Widerständen entsprechend der Anzahl der anzuschließenden Verbindungsleitungen ein n-Eck zu bilden und an die st Klemmen des n-Ecks die Verbindungsleitungen anzuschließen. Gegenstand der Erfindung ist nun eine Bemessungsregel, die es gestattet, die zt Widerstände ohne, besonderes Ausprobieren so zu dimensionieren, daß der Eingangswiderstand für sämtliche Anschlüsse gleich dem Wellenwiderstand der betreffenden Leitung ist. Die praktischen Verhältnisse liegen so, daß man für alle zu verbindenden Leitungen gleiche Wellenwiderstände voraussetzen kann. Sind nun an allen n Klemmen Doppelleitungen gleichen Widerstandes 2 angeschlossen, so ist der zwischen zwei Klemmen liegende Scheinwiderstand W gegeben durch Fordert man nun W - @, so erhält man für die Bedingung Zwischen je zwei Klemmen für die Leitungsanschlüsse liegt daher ein fest eingebauter V6'iderstand von der Größe Ist der betreffende Anschluß unbenutzt, so wird ein Widerstand 2 parallel geschaltet, um die elektrischen Verhältnisse zwischen den andern Teilnehmern nicht zu stören. Die Verwirklichung dieser Widerstände -Ji, die im ganzen Frequenzbereich der angeführten Bedingung genügen müssen, bietet keine Schwierigkeiten. Diese Widerstände sind, abgesehen von einem reinen Zahlenfaktor, identisch mit dem Wellenwiderstand der Leitungen. Man kann daher zu ihrer Verwirklichung alle bekannten Leitungsnachbildungen verwenden, die denselben Frequenzverlauf des Widerstandes haben wie der Wellenwiderstand der betreffenden Leitungen.For this purpose, it has already been proposed to form an n-gon from 7t equal resistors corresponding to the number of connecting lines to be connected and to connect the connecting lines to the st terminals of the n-gon. The subject matter of the invention is a sizing rule which allows the resistances, some of them to be dimensioned without special trial and error, in such a way that the input resistance for all connections is equal to the characteristic impedance of the line in question. The practical conditions are such that one can assume the same wave resistances for all lines to be connected. If double lines of the same resistance 2 are now connected to all n terminals, the impedance W between two terminals is given by If one demands W - @, one obtains for the condition A permanently installed V6 resistor of the same size is therefore located between each two terminals for the line connections If the connection in question is not used, a resistor 2 is connected in parallel so as not to disturb the electrical relationships between the other participants. The implementation of these resistances -Ji, which must satisfy the stated condition in the entire frequency range, does not present any difficulties. Apart from a pure numerical factor, these resistances are identical to the wave resistance of the lines. All known line simulations can therefore be used to implement them, which have the same frequency curve of the resistance as the characteristic impedance of the lines concerned.

Dieses System stellt Vierpole dar, die sämtlich untereinander identisch sind. Jeder der Vierpole hat den Eingangs-und Ausgangswiderstand `, jeder hat das gleiche Dämpfungsmaß, und zwar entfällt von irgendeiner auf einer Leitung ankommenden Spannung der (zt-i)-te Teil auf jede der übrigen Leitungen.This system represents Represent quadrupoles, all of which are identical to one another. Each of the four-pole terminals has the input and output resistance `, each has the same degree of attenuation, and indeed, of any voltage arriving on a line, the (zt-i) -th part is applied to each of the other lines.

Der Vorteil der beschriebenen Schaltung liegt in der vollkommenen Reflexionsfreiheit. Man könnte zunächst geneigt sein, die zu den 2 # it Eingangsklemmen parallel geschalteten zt Widerstände R als unnötigen, energieverzehrenden Ballast zu betrachten und annehmen, daß die Schaltung noch vorteilhaffer wäre bei Fortlassung dieser Widerstände. Das ist jedoch nicht möglich, weil man selbst bei verhältnismäßig wenigen Teilnehmern wegen der Aufteilung der Energie nie ohne Verstärker auskommen kann. Die Verstärker erfordern aber Reflexionsfreiheit, und der weitere zusätzliche Energieverlust spielt wegen der sowieso vorhandenen Verstärker keine Rolle mehr.The advantage of the circuit described is the perfect Freedom of reflection. One might initially be inclined to refer to the 2 # it input terminals Resistors R connected in parallel as unnecessary, energy-consuming ballast to consider and assume that the circuit would be even more advantageous if it were omitted of these resistances. However, this is not possible because you are even with proportionate few participants can never do without an amplifier because of the distribution of energy can. The amplifiers, however, require freedom from reflection, and the other additional Loss of energy no longer plays a role because of the existing amplifiers.

Claims (1)

PATENTANSPRÜCHE: i. Schaltanordnung zur gleichzeitigen Verbindung von n Teilnehmern, bei der alle zu verbindenden Leitungen an die Eckpunkte eines n-Ecks aus n gleichen Widerständen angeschlossen sind, dadurch gekennzeichnet, daß jeder Widerstand eine Größe besitzt, wobei 2 den Wellenwiderstand der zu verbindenden Leitungen bedeutet. z. Schaltanordnung nach Anspruch i, dadurch gekennzeichnet, daß jede der zu verbindenden Leitungen an die Enden eines der Widerstände angeschlossen wird. 3. Schaltanordnung nach Anspruch i und z, dadurch gekennzeichnet, daß bei weniger als n Teilnehmern. parallel zu den Widerständen 91, an welche keine Leitung angeschlossen ist, ein Widerstand von der Größe liegt.PATENT CLAIMS: i. Switching arrangement for the simultaneous connection of n subscribers, in which all lines to be connected are connected to the corner points of an n-corner made up of n equal resistors, characterized in that each resistor has a size where 2 is the wave impedance of the lines to be connected. z. Switching arrangement according to Claim i, characterized in that each of the lines to be connected is connected to the ends of one of the resistors. 3. Switching arrangement according to claim i and z, characterized in that with fewer than n participants. parallel to the resistors 91, to which no line is connected, a resistor of the size is located.
DEA57925D 1929-05-25 1929-05-26 Circuit arrangement for the simultaneous connection of several participants Expired DE551174C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA57925D DE551174C (en) 1929-05-25 1929-05-26 Circuit arrangement for the simultaneous connection of several participants

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE696036X 1929-05-25
DEA57925D DE551174C (en) 1929-05-25 1929-05-26 Circuit arrangement for the simultaneous connection of several participants

Publications (1)

Publication Number Publication Date
DE551174C true DE551174C (en) 1932-05-31

Family

ID=25946428

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA57925D Expired DE551174C (en) 1929-05-25 1929-05-26 Circuit arrangement for the simultaneous connection of several participants

Country Status (1)

Country Link
DE (1) DE551174C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1038609B (en) * 1955-08-02 1958-09-11 Siemens Ag Telephone conference system with two-way amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1038609B (en) * 1955-08-02 1958-09-11 Siemens Ag Telephone conference system with two-way amplifier

Similar Documents

Publication Publication Date Title
DE2511776C2 (en) Conference call
DE2413075A1 (en) CONFERENCE BRIDGE
DE2558981A1 (en) BROADBAND AMPLIFIER CIRCUIT
DE551174C (en) Circuit arrangement for the simultaneous connection of several participants
DE2517977C2 (en) Conference call in a time division multiplex switching system
DE550857C (en) Circuit arrangement for the simultaneous connection of several participants
DE2816831B2 (en) Variable equalizer
DE3640937C2 (en) Microwave power divider
DE616385C (en) Arrangement for the transmission of an audio frequency band at least three octaves wide
CH148295A (en) Method for establishing a simultaneous connection between subscribers in telephone systems.
DE2443941B1 (en) CIRCUIT ARRANGEMENT FOR REMOTE COMMUNICATION SYSTEMS, IN PARTICULAR TELEPHONE SWITCHING SYSTEMS, WITH COUPLING AREAS WITH REVERSE GROUPING
DE1762764A1 (en) Hybrid feedback amplifier
DE932024C (en) Circuit arrangement for conference systems
DE670084C (en) Method for reducing disturbances caused by wave resistance fluctuations in telecommunications and, in particular, high-frequency cable systems consisting of several amplifier fields
DE521289C (en) Transmission system with devices controlled by the streams to be transmitted to regulate the transmission
DE613857C (en) Procedure for increasing the cut-off frequency of already installed long-distance cable systems
DE504349C (en) Transmission equipment, especially for audio frequency duplex telegraphy
DE903221C (en) Circuit arrangement for the interconnection of lines of any kind in long-distance switching systems
CH148296A (en) Method for establishing a simultaneous connection between subscribers in telephone systems.
DE558862C (en) Circuit arrangement for monitoring telephone connections
EP0007629B1 (en) Electrical filter network comprising charge transfer device lines with separate charge transfer elements
DE713195C (en) Changeable equalization network
DE2202305C3 (en) Coupling device
DE2704318A1 (en) Line junction consisting of charge transfer lines - has lines combined in pairs and all lines having common charge exchange capacitor
DE597826C (en) Switching arrangement for eliminating the acoustic feedback between the microphone and loudspeaker, which are fixed in their mutual position, especially in conference telephony systems