DE738099C - Circuit for telephone systems with people search facility - Google Patents

Description

Circuit for telephone systems with person search facility The main patent relates to a circuit arrangement for people searching devices in telephone systems, in particular N.eb@enstellenanlagen with a to identify the person to be searched for Participant-serving voter, both through controlled election on a particular Participants to be searched for can be set as .also searcher-like automatically on the connection line of a preferred subscriber to an incoming subscriber Call stops. The use of the search facility is only initiated when when the desired preferred subscriber has been called to no avail for a certain period of time is. This delay in the activation of the search device is undesirable and is avoided by the invention. That one or more preferred Participants switching means individually. assigned by one of the preferred Participants, for example when leaving the workplace, executed switching action can be brought into effect in preparation and when one arrives for this Initiate the immediate activation of the search facility for a particular call participant. With this arrangement, the person search device is switched on immediately after dialing the number of the desired participant.

Another feature of the invention is that the to be searched Participants are assigned switching means, which after notification of the wanted participant The wanted subscriber's own phone via the common reporting line switch off. This is in a simple manner achieved that the Ringing current transmission to the desired subscriber's own telephone until the message is received it can be maintained that .but still listening in via the message line conversation is not possible over this set. On the other hand is through further switching means also listening in on what is desired via your own device Prevented a conversation over the reporting line.

An embodiment of the arrangement according to the invention is on hand of the enclosed circuit. The circuit shown is based on closely resembles that of the main patent, but also contains additional switching means, a preferred subscriber by dialing a code via the house connection facilities the immediate initiation of the search in the event of a call to this subscriber Allow to prepare, as well as other switching means that have a secrecy-the Ensure conversations between the participants to be searched for.

If the preferred subscriber shown in the circuit leaves his workplace, he picks up the receiver and dials a code number. When the receiver is picked up, the call relay R responds and lets the preselector VW on in a known manner, so that it @ adjusts to a free line selector LW. The test relay T responds, blocks in a known manner by short-circuiting its high-resistance winding at t1 and switches off the call relay R at its contacts t2 and 13 and the speech lines through. The preferred subscriber receives the dialing character and dials the prescribed code, e.g. B. o or oo. According to this code, the line selector sets itself to a contact to which the line is connected anyway. When checking the line selector, the relays P, I (, LI (respond in series via the c-arm. The test relay blocks in a known manner through its contact p. The relay LK responds and lifts the short circuit of its second high-resistance winding when it is lltl so that the I <relay can no longer hold and drops out. By briefly closing the contact h, a high-resistance winding of the relay V is temporarily short-circuited and the current through the test lead of the preselector is temporarily increased, so that a delay relay U The relay U maintains its contact ttl depending on the normally closed contact r1 of the call relay. After dialing the code number, the preferred subscriber can hang up his receiver, which causes the relays T, P and L1 \ 'again If a call arrives for the preferred subscriber, the following circuit is established: Earth, P, I (, c-arm of the call concerned used line selector LW, S, winding I, c-arm of the VW of the called preferred subscriber in the idle position. U, winding I, T, battery.

In this circuit, the relays P, S and T respond. Relay T.

If the search device has not already been used, the following circuit is now established: earth, u3, s3, c7, Pß, ANH, AN, winding II, battery.

In this circuit, the relays ANH and AN respond. Relay ANH holds with anlzl, prevents with anlt. the heating of the hot wire relay Th in the case of a call from a subscriber equipped with a search facility and switches the test relay P of the switch-on selector SW from the c-arm to the d-arm of this selector at ault. The relay AN- starts the switch- on selector SW at att3, prepares the test circuit at au2 and the circuit for the common signaling device T at atze. The switch-on selector SW runs until it finds the line of the desired preferred subscriber. In this case the following circuit is established: battery, P, an, sulz ,, d-arm of the SW, u2, s3, earth.

The relay P responds, holds on p1, switches on p2, p3 through the speech wires to the transmitter Ue, switches at p1 via the e-arm of SW the common signaling device and stops the switch-on selector at p5. p @ E Opens the circuit for ANH and ANII in preparation.

The signal assigned to the desired subscriber now appears everywhere in the factory building, while at the same time LW ringing current is transmitted to the preferred subscriber's own telephone via the speech switch arms of the line selector. Two cases can now arise: r. If the desired subscriber reports from his own device, the Rufstromabschaltelais (not shown) in the line selector LW in series with the second winding of the differential relay S is activated; the ringing current transmission is thus interrupted and relay S drops out. Relay S disconnects the circuit of relayP at its contact s3. The switch-on selector switch therefore returns to the rest position via contacts where and p5. A third party listening in on the existing conversation over the connection line via the common message line is therefore excluded.

z. The desired participant answers from anybody. Apparatus over the common message line on, bm, the relay M speaks as in the arrangement according to the main patent .an and closes its Kontaktemi and tn2, so that -the subscriber is switched through to the right side of the transformer Ue and the relay, 4 to Appeal comes. With a1 relay VA responds, with vai the relay VB responds and with vag the test relay P holds regardless of any opening of the contact ss. At Kontaktas the loop is closed over the left side of the transformer Uz. The second winding of the D # ifferenzrelais S is in turn energized in series with the Rufabschaltelais in the line selector, so that the ringing current transmission is also broken and the S relay drops out. This time, however, the opening of the s-contacts does not trigger the switch-on selector SW, since the relay P, as mentioned, is held by the contact vag depending on the subscriber connected to the message line. In addition, the relay SH is activated in the loop circuit, which at slti, s112 interrupts the connection to the person's own device and in this way inevitably prevents a third person from overhearing the conversation. Such an SH relay is not only in the line of the preferred subscriber, but each subscriber to be searched for can be assigned such a relay.

If a non-preferred subscriber connected to the common search device is called, then, as in the arrangement according to the main patent, the hot wire relay TA assigned to the common search device is heated via the s4 contact of the S relay of this subscriber, so that after a For a certain time, the starter relay AN will respond via its winding I and would cause the search dial to be set to the line of this subscriber. It is assumed, however, that during the heating time of the relay Th before switching on the th contact, a call comes in for the preferred subscriber shown in the figure, after this subscriber has previously made his relay U respond in the manner described by dialing the code number would have. In this case, the response of the hot wire relay is not waited for, but via the contacts u3 and s5 and the relay ANH, the starting relay AN is made to respond directly via its second winding in the manner described. There would now be the risk that the 4nschaltwähler SW immediately started in this way would first find the contacts of the ordinary subscriber in its contact bank, so that not the line of the preferred but of the ordinary subscriber would be connected to the transmitter Ue and the search signal of the ordinary would take place of the preferred subscriber is switched on. To prevent this, the contacts u2 and aith3 are switched to the special d-arm, to which only the preferred subscribers are connected, in the manner described. The same could also be achieved without the special arm d in that the preferred subscribers are connected to the beginning of the contact bank of the selector SW.

However, the search facility is already for an ordinary subscriber in use, the contact will delete the already switched on Prevented search signal in favor of a preferred subscriber.

If the preferred participant returns to his workplace, in this way he can simply pick up the receiver for a while Bring the U relay to drop out again, because in this case the call relay R responds and at r1 the holding circuit of the U relay opens. The one brought about by the U relay The preparatory switchover is canceled and the original switching status is canceled manufactured. The same thing happens when the preferred participant returns on his workplace initiates an outgoing connection.

It should also be mentioned that the energization of the changeover relay U takes place through current amplification via the c-core, for example also through current amplification or another criterion could be addressed via a speech artery. Furthermore, the invention is not tied to a preselection system.

As mentioned, the invention can be used with particular advantage in Connection with the arrangement according to the main patent, in which usually the Activation of the search facility automatically after a conscience Time takes place; however, the invention can also be used to advantage in connection with such Circuits are used in which the search device is usually dependent of a special switching measure carried out by the calling subscriber is moved.

Claims (1)

PATENT CLAIMS: i. Circuit for telephone systems with a person search device according to patent 708 066, characterized in that switching means (U) are individually assigned to one or more preferred subscribers. which are brought into effect in a preparatory manner by a switching measure carried out by the preferred subscriber, for example when leaving the workplace - and cause the search device to be switched on immediately when a call intended for this subscriber arrives. a. Circuit according to Claim i, characterized in that the switching means (U) is activated via the two-wire connection line of the preferred subscriber. 3. A circuit according to claim z, characterized in that the switching means (U) is brought into effect by dialing a code number on the part of the preferred participant, for. B. by current amplification on the test wire (c). q .. Circuit according to one of the preceding claims, characterized in that the switching means (U) holds itself until a further switching measure is carried out by the preferred subscriber. 5. Circuit according to claim q., Characterized. that the switching means (U) lasts until an outgoing connection is initiated by the preferred subscriber (e.g. briefly lifting the receiver) and that the holding circuit of the switching means contains a contact (r,) of the call relay (12). 6. Circuit according to one of the preceding claims, characterized by switching devices (ANH) which come into effect when the common search device is occupied in the event of a connection to a preferred subscriber and the connection of the search device to the line of another, already marked as ztt searching Prevent participant. 7. A circuit according to claim 6, characterized in that the switching devices (ANH) the test switching means (P) of the connecting device (switch-on selector SW) serving to connect the search device to the subscriber lines in the case of a connection to a preferred subscriber to a special switching arm (d) of the connection device. B. Circuit according to claim 6 or 7, characterized by switching means (P6) which prevent the occupancy of the search device for the preferred participant when the search device is already set to the signal corresponding to another participant. 9. Circuit according to one of the preceding claims, characterized in that the subscribers to be searched for are individually assigned switching means (SH) which switch off the desired subscriber's own device after reporting the sought subscriber via the common reporting line (at the contacts shl, slz2) . ok Circuit according to Claim 9, characterized in that the switching means (SH) are located in the speech lines leading to the common message line. i i. Circuit according to Claim 9 or 10, characterized in that the subscribers to be searched for are individually assigned switching devices (S) which, after the subscriber sought has been reported on his own device, cancel the connection with the common reporting line. 1z. Circuit according to Claim it, characterized in that the switching devices (S) are those for connecting the common message line to the line of the subscriber sought. Trigger the connecting device (SIV switch-on selector by interrupting the test circuit (with s-).