DE1762186C3 - Circuit arrangement for initiating a collective call in an intercom with several subscriber stations - Google Patents

Description

The invention relates to a circuit arrangement. The answer to such a group call is in order to initiate a collective call in an intercom according to one embodiment of the invention with several subscriber stations, one that can be directed to the actuation of the group call button Connection set and one per subscriber circuit for a called subscriber station to operate the Coupling relay for outgoing and incoming 65 assigned coupling relays for incoming traffic having. This input and output side sweeping leads and that the relevant subscriber station Connection of the subscriber circuit to the one above with the output side of the connection set The connection kit has the advantage that the system is connected. The called subscriber is then

Regardless of the location from which he answers, automatically connected to the output cord of the connection set and thus to the calling subscriber station who has switched to the input side of the connection set. S.

So that when you press the collective call button, the called subscriber station is sent to the connection set is coupled is in the collective call state to one of the multiple-switched control cores of the connecting lines a control potential is switched on, via which the coupling relay for incoming traffic of the relevant subscriber circuit can address.

The automatic triggering of the collective call when the called subscriber reports via a any subscriber station is lach an embodiment of the circuit arrangement according to the invention initiated by a measuring resistor in the multiple line for the coupling relay for incoming traffic is switched on. at the when the called subscriber station was reported: a control voltage occurs, which controls the control circuit for the collective call relay switches ineffective. The collective call relay then separates the receiving devices of the subscriber stations in the idle state again from the output of the collective call amplifier 2 = away. The connection is then limited to the calling and called subscriber station.

Since the initiation of the collective call from the calling party only as a short switching command is issued, it is also provided that the collective call relay has its own contact Brief switching command given by the register by evaluating the collective call code character is maintained until the collective call is triggered by the subscriber station called. the The collective call status is then independent of this switching measure by the calling subscriber up to to report the called subscriber.

The invention is explained in more detail with the aid of a circuit diagram of the new system shown in simplified form explained.

Each subscriber circuit TS contains the two coupling relay A 1 for outgoing traffic and B I for incoming traffic. The relay A 1 switches when it is occupied - pressing a selector button - with its contacts α 12, α 13, α 14, the wires α to d of the subscriber line TL to the input of the connection set, not shown, while the coupling relay B 1 controlled via the transistor switch stage Tr with the contacts b 12 to b 15 connects the wires of the subscriber circuit to the output of the connection set. All subscriber circuits are multiple-switched with the input and output of this connection set.

In the central control part Z, the control potential + is applied to the multiple lines 26, 29, 34 and 35 to the subscriber circuits TS in order to be able to determine whether the system is being occupied by a calling subscriber station. This assignment can z. B. be initiated by pressing a dial button, which identifies the called subscriber station.

The control potential is offered to the multiple lines 23 and 36 via a monitoring circuit for marking control and preventing double assignments with the switching stages T1, T1 , T3 and TA .

The normal assignment of the connection set, i.e. H.

the response of the coupling relay A 1 is initiated with the aid of the coupling relay B 1 as an occupancy hill's relay in the following circuit:

■! -, j9c ·, .1 32. D 12, R 3. 29, D3, ο 14, el, ei. a 12.
Dl. Rl, Rl, 36. Π. R4, -

The switching transistor Tr is controlled by the voltage drop across the resistor Ii 2 , and the coupling relay B 1 responds in the following circuit:

r, .v 9 c, ν32. D 7, 34, B 1, Tr, 36, RS,

The voltage drop across the resistor R 5 is not sufficient to make the threshold circuit with the transistor Tl respond. The contact ft II therefore closes a circuit for the coupling relay A 1, which runs as follows:

• , s9c, s 32, DIl, 35, ft 11, Al, 23, Tl, R4,

A voltage drop occurs across the resistor R 4, which modulates the transistor Ti. The occupancy relay S3 responds. The occupancy circuit for the coupling relay Bl is interrupted via the contact \ 32. The coupling relay Bl drops out. Contact v31 closes the hold circuit for coupling relay A 1, which runs as follows:

-i, s31, D6, v9rl, D4. 26, «11, Al, 23, Tl, R4,

The occupancy relay .V3 takes over the connection of the dialing reception to the others α to d of the calling subscriber line TL connected to the input of the connection set.

A double assignment is prevented by the threshold value circuit with the transistor Tl , which interrupts the marking line for the coupling relay. The transistor T 1 is controlled with a high resistance. The switching stage with the transistor T4 responds when two coupling relays A 1 have responded. Any existing double connection is triggered.

In the election receiving the light emitted from the calling subscriber station code characters is evaluated and exploited directly for controlling the coupling relays Bl the called subscriber station.

If the connection does not come about because the called subscriber does not answer, the so-called collective call button is pressed on the side of the calling subscriber station. Is by the Teilnehmerst-tl'.e the connection kit is already occupied, then the special code characters is evaluated and included directly controlled by the register Reg of the Transistnrschaltstufe T5. The downstream collective call relay SA responds. The collective call status is maintained via contact sa3, even if the switching command is terminated in the calling subscriber station. The collective call relay S / l switches the control potential + with the contact yes 4 to the multiple line 29 and thus to the control wire d.

The assignment of the connection set can also be initiated directly via the collective call button. The collective call relay SA is immediately energized.

The two wires of the subscriber line TL, which lead to the receiving part of the subscriber station are about the rest sides of the contacts α 13, α 14 and 14 ft, 15 ft to a common multiple of all subscriber circuits TS out. This common multiple

is in response of the Sammclansehlußrclais SA through the contacts .να 1 and sal switched to the output of a Sammclrufvcrstärkcrs VA.

If the calling subscriber presses his speech button, then he can place all subscribers via the Collective call amplifier with the input of the connection set and thus with the calling subscriber station is coupled.

The desired subscriber can now report to any subscriber station. He actuates the collective call button, the coupling relay S1 of the relevant subscriber circuit TS being excited via the connected control and marking potential +. The coupling relay / JI then connects the called subscriber station to the output of the connection set.

In the monitoring circuit in the Vielfachlcitung for Koppclrelais is reporting, the response that is to say on the Sammclanruf, monitored via the resistor Rll Transistorschaltstufc a T6 is coupled to the measuring resistor Λ5. This switching stage T6 always responds when at least one coupling relay Bi is addressed. The conductive transistor T6 short-circuits the control circuit for the transistor TS. The collective call relay SA falls ar

ίο and the combined connections of the subscriber circuits TS are via the contacts sa 1 and sal from the output of the collective call amplifier! VA switched off. The collective call status is canceled and the called subscriber is automatically connected to the calling subscriber station via the subscriber station reporting it.

1 sheet of drawings

Claims (6)

Direction-dependent amplifiers in the central part have claims: can or can work in four-wire operation. 1.Circuit arrangement for initiating a system of this type can either be an intercom group call with an intercom mft mch- 5 or an intercom operation Subscriber circuit each a coupling of a certain connection to meet an Ausvvan relay for outgoing and incoming traffic process. The selection of the called 1 means that either a collective connection relay (SA) is provided for the systems of this type. directly through an assigned Lm. key, which can be controlled by a switching measure (e.g. collecting or by delivering a certain wahtor call key) of a calling subscriber, which is evaluated in the central control unit and which all become the subscribers in the idle state. filters connected in parallel (α 13, a 14, b 14, b 15) In many cases, it iit now so that the called 1 e.lnehmer receiving devices (ie speakers.) with 15 is not reachable at his subscriber station. the output of a collective call amplifier (VA) . Therefore, precautions must be taken to connect the system ( see also 1, sal). to search for this participant. 2. Circuit arrangement according to claim 1. there- i'ber a separate people search system can be characterized in that called participants with the collective call are searched and the normal connection establishment (switch on 20 the intercom system is requested to report via button. There are also the participant over the coupling relay A 1 known for combinations in which, in addition to the outgoing voice traffic to the input side of the telephone system or a person search system pre-connection set) can be initiated and that can be seen over. The code assigned to the hunt group call is the object of the invention to provide a circuit symbol that controls the evaluation device (Reg) directly to initiate a hunt group call at the hunt group relay (SA) («21, 75). to an intercom with multiple participants 3. A circuit arrangement according to claim 1 and 2, which in a simple manner the intercom, characterized in that the actuation of the functions of a people search system expands the collective call button for a called subscriber. According to the invention, it is assumed that there is a point for actuating the associated coupling intercom system, which carries a connection set relay (Bi) for incoming traffic and and for each subscriber circuit has a coupling relay for the relevant Teil.ichmcrstclle about it with outgoing and incoming traffic , the output side of the connection set connected The extension to the functions of a person is. search system is according to the invention thereby 4. Circuit arrangement according to claim 3, that is sufficient that a hunt group relay is provided, characterized in that in the hunt group call by a switching measure (z. B. collective call status to a control wire (29) of the connection button) of a calling subscriber: is controllable and lines to the subscriber circuits (TS) that all in the idle state of the subscriber stations par control potential (+) is switched on (see 4). switched off receiving devices (e.g. loudspeaker 5. Circuit arrangement according to claim 3 and 4, 40 speakers) with the output of a collective call amplifier, characterized in that connect in the multiple kcrs. The combination of the receiving line (36) for the coupling relays (51) for incoming devices of all subscriber stations in the idle state mending traffic a measuring resistor (RS) made possible with a single collective call relay that is switched to which when reporting the called direct response to all subscriber stations. The Sam subscriber station receives a control voltage, the 45 melanrufrelais acts as a special coupling via a switching stage (Λ22, 76) the control circuit relay for incoming traffic. So that enough (75) is available for the collective call relay (SA) ineffective speech power, these can switch. summarized participant positions at the 6. Circuit arrangement according to claim 1 to 5, passage of a separate collective call amplifier indicated thereby marked that 50 scnetzt has its own. Contact (saS) of the collective call relay (SA) of the In order to receive the collective call from the usual connec- to separate from the register (Reg) by evaluating the fertilization, is according to one embodiment of the Collective call code given short-term circuit arrangement provided according to the invention, Switching command until the collective call is triggered that with the collective call button the normal connection by the called subscriber station (connection of the subscriber via the is preserved. Coupling relay for outgoing traffic on the input side of the connection set) can be introduced and that assigned to the group call button Code character the evaluation device directly the 60 hunt group relay activates.