DE312184C - - Google Patents

Description

■ In telephone systems with amplifiers built into the switching point, one has so far to switch them on and off during a. Conversation special lines provided between subscriber station and switchover point. ■

This arrangement has the disadvantage that with subsequent installation of amplifier devices Relatively extensive changes to the pipeline network that make the system more expensive in existing systems required are. ν

The invention now aims to eliminate this drawback. To this The purpose is to switch the amplifier on and off during a call those already for the ordinary. Speech communication existing lines (speech, Inquiry, group call lines, etc.) used, in this case differently operated, than is done for the known purposes.

In the following the invention will be applied to known circuits, e.g. B. described on a circuit in which the contact of the handset hook of the subscriber station usually used. to connect or disconnect from the Office, and Furthermore, a button is provided to the officer of the branch exchange in a known manner to give a sign without calling the main office. According to the invention, the contact of the receiver hook is hereby established except for establishing and disconnecting connections with the office via the voice lines also to optionally switch on the amplifier, and the button with which of the participants is usually the same as the extension officer if over the intercom can call, used to switch off the amplifier.

Various exemplary embodiments are schematically illustrated in the drawings, and in fact Fig. ι and 2 show a ■ circuit in which the for the production and disconnection of the connection serving contact of the handset hook for switching on and the switch-off button provided for the flickering signal to the officer at the transfer point of the amplifier is to be used, with only the two for all switching operations Voice lines are available between the ward and the switching point stand. 3 to 5 explain a circuit in which the otherwise already existing. Inquiry lines with the arrangements for switching the amplifier on and off as required are provided, namely Fig. 3 shows the arrangement purely schematically, while Fig. 4 shows the connection with the inquiry device represents. FIG. 5 explains a modification according to FIG. 3.

In the embodiment according to FIGS. 1 and 2, each extension is assigned a dialer in addition to a calling and disconnecting relay, which can be set to the individual exchange lines and can be switched on by the calling relay via a key NT which is also assigned to the extension. The trunk lines end at the contacts of the

Voters and are provided with facilities for querying, connecting and disconnecting calls. The amplifier device V st , which is also provided, can be switched on as required by the amplifier connection relay Va and, if necessary, switched off again with the aid of the relay X.

The plant is operated in the following way:

ίο Will an extension N ₁ perform a trunk call, it energized by lifting their handset associated with the their direction, ι via normally closed contacts 2 of their isolation relay T in the phone line lying call relay N. This defines by means of a contact 7 of the rotary magnet D of the selector of the calling Subscriber to the interrupter U ₁ , so that the switching arms a, b, c of the selector are rotated over the connections of the individual exchange lines. If the connection of an unoccupied line is touched, the isolating relay T is excited via the c-wire and the C-relay of the relevant exchange line: earth * battery, contacts 42, 36, 23, 26, 19, relay C, isolating button TrT, c-wire, relay T, extension button NT, ' contacts 6, 40, earth. By opening the contact 4, the rotary magnet D of the selector is switched off. At the same time, the changeover contacts, 2

the call relay N from the voice line and this switched itself through to the exchange line. The feed relay S, which is now in the subscriber loop, responds; Earth, battery, winding I of relay X, winding I of relay 5, contact 9, α-wire, subscriber station N ₁ , fr-wire, contact 1 o, second windings of relay 6 ¹ and X ·, earth. As a result, contact 12 is closed and a holding circuit is established for relays T and C : earth, battery, working contacts 12, 19, relay C, isolating button TrT , c-wire, relay T, contact 3, earth. The relay X , which is in series with the -S relay, remains idle, since its windings are switched against each other in this case. By closing the contact 13, the relay F is energized, which causes the call to the office by closing its contact 29 (Fig. 2). By closing the working contact 27, the B relay is energized: earth, • battery, relay B, contact O of the switching arm dv, working contact 27, earth. Relay B turns on the rotary magnet DV of the busy switch device at contact 37. the interrupter U ₂ placed, whereby the magnet DV advances the arm dv . The purpose of this facility is as follows:

If the switching arm dv leaves its zero position, the relay B is de-energized again. The busy switching means remains until the call is closing in this position and 'then locks by opening the contact 36 at the end of the call, during its return run in the zero position of the trunk line ^T for a time for the outgoing \ he returning to a hook-up to avoid this trunk before the bond is ^{\ r severed in office.}

A connection from an extension to the exchange is now established.

If, on the other hand, the exchange calls the main station and wants to use it to reach an extension, the operation proceeds as follows: The. This turns on its contact 39, the H- ^ relay which closes with contact 24, a holding current for itself and the call lamp AL: earth, battery, relay H or earth, battery, call lamp AL, contacts · 24, 28, 38 , Earth. The operator connects to the exchange line via contacts 59, 60, 61, 62 by flipping the voice switch assigned to the exchange line and accepts the request of the office. * 'When the voice switch is turned, the relay F is energized: earth, battery, relay F, contact 161, earth. The relay F keeps the final signal in the office with contact 29 and switches off the // relay with the call lamp at contact 28. Furthermore, as already described above, the busy switch device DV is prepared for the return by contact 27. Furthermore, F closes contact 25.

If an extension is to be connected to the calling exchange line, the officer presses the relevant extension key NT, whereupon the ■ rotary magnet D responds via earth, battery, interrupter U ₁ , D, 4, 65, earth and the voter with his arms a, b , c turns to the calling line. When the NT button is pressed, the relay G is energized via earth, battery, G, contacts 63, 3, earth. This moves the contact 40 and closes 41. Now the relay E responds on the way: earth, 41, 30, 11, 25, relay E, battery, earth. Relay E closes a circuit independent of F via 31 and also closes the circuit: earth, battery, 32, relay C, TrT, c-arm, T-relay, 64, 40, earth. Relays C and T respond, relay T closes contact 5 so that the associated busy lamp BL lights up. When the common relay G responds, all outgoing traffic is blocked by removing the test voltage for all exchange lines by opening contact 42. By closing the contact 41, on the other hand, the relay E becomes the trunk line

energized, and thus made ready for testing again, in which the speech switch is thrown and thus the relay F is energized. By opening contact 4, the voter is stopped and the voice line is switched through to the voter and the exchange line through the changeover contacts 1, 2. Through the contact 33 closed by relay E , the call switching relay R was connected to the slow interrupter U ₂ , and so on. after the voice line has been switched through, the extension is called intermittently. The clerk recognizes the activation of the call by the flickering of the office busy lamp ABL under the influence of the relay R. The operator now puts the speech switch in the rest position and also lets go of the extension button NT .

If the extension answers, the corresponding ^ relay switches off relay E (on contact 11) and thus also R (on contact 33). S switches the relay F on again at contact 13, and this now holds the final sign in the office at contact 29, which was previously held by contact 35 (FIG. 2) of relay E.

The speech streams coming from the office are transmitted through the transformer Tr and run via the α line, normally closed contact 45, speech switch 60, 59, normally closed contact 9, normally open contact 2, extension N ₁ , normally open contact i, normally closed contact 10, speech switch 61, 62, normally closed contact 44 after the b line.

With the help of the TrT button, the officer can clear an established connection again if the called subscriber does not answer.

Will the extension during a call switch on the amplifying means so it moves only a few times the handset hook up and ^down: whereby the relay S corresponding times is temporarily shut down. When the armature 14 falls it touches the conductive left side of the contact 14 ⁰¹ , which is provided with an insulating piece on the right, so that the relay V is energized on the way: earth, contacts 22, 14, i4 ^ff , relay V, battery, earth. This circuit was not closed when the relay 5 was energized earlier, because the armature 14 comes to rest against the isolated right side of the contact 14 * during the operation and then slips through under the resilient contact 14 ^s without making contact. The relay V prevents the contacts 16 and 17 from the otherwise occurring direct collapse of the connection at 12, 13 and the final signaling to the office. The immediate response of the relay 5 "after the energization of the relay V 15 will contact 18, 52 turned on .Verstärker- · anschalterelais Va, which is more than 51, 21, 52 (in a holding current Earth, 51, 21, 52 , Va, battery) inserted and the contacts 44, 45/49, · 50, the Verstärkerein-;. directionally Vst in the a- and ^ branches running the telephone line turns on the next by the Office opening flows are now via the transformer Tr _1,. contact 29 to the office and be of winding Tr ₁₁ transmitted ₁ J to the amplifier V ₁ via contact 49, capacitor C _1, amplifier relay V _1, normally closed contact 56, normally open contact 50, transformer winding Tr. the switched by contact 48, amplifiers microphone of V ₁ er -, the transformer J ₁ demonstrates in the winding 1 an enhanced speech power, the first acts on the winding 3 to the built for high current boost amplifier relay F ₃ the microphone of this amplifier V _s energized via the transformer J _3, the vibration relay R _1, which. jet zt responds and the contact 54 opens. The relay U _1, which has been short-circuited up to then via contact 54, now responds to the following on the way: earth, U ₁ , resistor, battery. By closing the .Kontaktes, 58, the relay U ₁ closes the Hörstromkreis for the extension by winding 2 of the transformer J ₁ via normally closed contact 55, normally open contact 45, opening switch contacts 60, 59, break contact 9, Wählerschaltarm a, contact 2 according to the extension N ₁ and back via normally open contact 1, selector switch arm b, normally closed contact 10, speech ■. toggle switch contacts 61, 62, normally open contact 44, normally open contact 58 to J ₁ . A further provided amplifier V ₂ is switched off when speaking from the office by contact 57 of the relay U ₁ in order to avoid influencing the amplifier V _1. If the extension speaks to the exchange, the relay is first activated with the aid of the amplifier V _2. R ₂ excited via the transformer J ₂ , whereby at 53 a shunt to the relay U _{2 is} canceled and this is excited. "The relay U ₂ switches off the amplifier V ₁ at contact 56 and switches the line to the office at the working contacts 55 and 56. If the extension wants to switch the amplifier off again during the call, it briefly presses the assigned button At . thus, the branch is set & ah earth, so that lie on b- branch over contact 10 of the relay windings -S "and X short-circuited, while the windings lying above the contact 9 at the α-branch of the relay X and their .S Keep electricity. The relay 5 "therefore remains energized and X responds because its second differential acting winding is short-circuited. The relay S stops at the contact

bar 12 den. Circuit upright via the c-wire and thus prevents an atis solution. The relay X opens the holding current of the amplifier switch-on relay Va at contact 52. This is suppressed and switches the speech lines together at contacts 44, 45 without amplification. The participant. Can switch on and. Repeat switching off as often as you like.

The connection is disconnected in the usual way by hanging the handset on for a long time. This interrupts the supply current and the relay S is de-energized. The relay V is energized for a moment via contact 14, but this has no further consequences. After the armature of relay V has also dropped out, the circuit of relay F is opened at contact 17 and that of relays C and T is opened at contact 16. All relays are de-energized. The relay F gives the final signal to the office with its contact 29. Relay F closes the circuit for relay B (earth, 27, 34, dv, B, battery) at normally closed contact 27 ″ ; relay B responds and closes the circuit at 37; battery, rotary solenoid DV, 37, interrupter U ₂ , earth. the rotary magnet DV turns the arm dv gradually continues until dv leaves the slip ring and is pushed ο to the zero contact. at this moment, the relay B loses its power. the rotation of the arm dv can be made arbitrarily slow, z. B. 20 seconds circulation. During the energization time of the relay B is open its contact 36. Since the subscriber selector must check on this contact 36, the trunk remains until the deenergization of the relay B suspended so that it can be assumed with great certainty that the connection has meanwhile also been severed in the office.

The contact of the receiver hook is therefore used on the one hand in the subject matter of the invention. to disconnect the connection if it is kept open long enough (until the armature of the relay V has dropped out), and on the other hand to switch on the amplifier if it is opened very briefly.

In addition to switching off the amplifier, the At button also serves to signal the extension officer to flicker. As described earlier, the subscriber should briefly press the At button to switch off the amplifier. If he wishes to flicker to the branch clerk, he must press the At key in the usual way about eight to ten times a minute, that is, slowly. The relay X is de-energized, "whereby the relay 5 remains energized. If relay 5" is energized, X is de-energized, then a delay relay W receives current on the way: earth, 66/67, W, battery. During brief de-excitations of the relay X, such as those required for switching off the amplifier, the amplifier is 65 | the armature of the relay W \

do not let it fall off, .will by longer;

De-excite a lamp circuit at 68:

Earth, 66, 68, 69, lamp ABL, battery ge;

closed. The extension officer is called by the flickering of this lamp.

In the exemplary embodiment, a Ver, |

explained in greater detail ¹ , which only amplifies the speech streams arriving from the office, but does not amplify the speech streams emanating from the station. A double-acting amplifier can of course be used in the circuit without changing the invention.

In the exemplary embodiment according to FIG. 3, the exchange line 102 arrives from the right, 104 is the call relay, 152 is the feed bridge designed as a relay for the. Next to-. Job. The windings I and II of the relay 152 are intended to act differentially; they must therefore have such a high resistance that the speech loss can be neglected. 140 is the one to the microphone 131 of the extension, and 120 is the wire pair leading to the receiver 143 of the extension, 126 is the amplifier, 128, 129 are bridge resistors, and 130 is an artificial cable approximated to the external line 102 in a known circuit. The relay 152 has the contacts 15 2 ^a , I52 ⁶ , "152 °, 152 *, 152", which are drawn in the rest position in FIG. 3 as well as in FIG. It should be noted, however, that in this position the circuit of the amplifier microphone would be permanently closed, which is not permitted. The amplifier current is therefore switched on through a contact on the plug 148 (FIG. 4) only while the amplifier is in use.

This state is shown in FIG. 3. The transmitter voice current runs from the microphone .105 phon 131 over 140, 152 °, .129, 152 *, trunk line 102, 140, microphone 131. The microphone is fed on the way: battery, 141, winding I of relay 152, 140, microphone 131, line 140, 152 °, 129, 15a ⁶ , winding II of relay 152, earth. The receiver circuit runs from the exchange line 102 via wire a, 152 ^s , amplifier 126, 127, 130, 152 "·, exchange line 102, wire b. The amplifier 126 acts on the microphone, which in turn amplifies the incoming speech currents via the coil 150, 154 forwards to the handset 143 at the extension.

If the subscriber wishes to switch off the amplifier, he presses the T. Diac button with the winding II of the relay 152 is short-circuited, so that the relay 152 is his

Anchor, attracts and kills all of its contacts. The amplifier 126 is switched over at the contacts 152 ° 'and 1.52 ^{6 , at 152 0} a winding III. Of the induction coil is switched on, so that the incoming speech currents from 102 via wire a, III, 152 *, 140, microphone 131, 140, 102, wire b and are transferred from winding III to winding 154 in the known manner. At I52 ^e the supply current of the amplifier microphone is opened. ■

The subscriber brings the T key again in the rest position, the relay 152 acts ^How-1 of the differential, ie, it switches the amplifier again. Switching on and off can be repeated as often as required.

4 now shows the adaptation of a complete extension circuit to the Amplifier arrangement according to Fig. 3.

In FIG. 4, 101 and 102 are double lines arriving from a telephone exchange for central battery operation, the individual branches of which are denoted by α and b. Between these two branches α and & there is a call organ 103 or 104 with an upstream capacitor 105 or 106. The dotted frames 107 and 108 each enclose a telephone extension, and these extensions can be switched with the help of switches 109, 110 or in, 112 can be connected to the trunk line 101 or 102. At 113 and 114, the call organs of the two extensions 107 and 108 are shown in simplified form, and. at 115 and 116 the associated connection pawls of the extension switching devices to which the plug 117 and 118 connect the Ne-. can be established between each other. With 119 and 120 inquiry lines of the extensions 107 and 108 are designated, d'ie are switched on when required by flipping switches 121, 122 in their β lowest position. The central battery 123 is used to supply the microphone and call stream. So far, FIG. 4 shows a circuit of a private branch exchange system with a central battery operation, carried out in the usual manner.

The framed part 124, the two loudspeaker amplifiers, is inserted into this usual circuit 125, 126 of any design with the associated compensation circuit contains. In the present case, the known combination of a telephone and a battery 153 is used as an example Assumed microphone to an amplifier and as a compensation circuit that in principle also known system according to FIG. 3. Corresponding parts are shown in FIGS. 3 and 4 with the same reference numerals. This compensation circuit is known to be necessary in order to influence the amplifier through the transmitter microphone of the ^ extension prevent, otherwise a whistling will occur in the listener at this point. The compensation circuit consists for example of a combination of the amplifier 126, the blocking the central battery current is preceded by a capacitor 127, with two others the same ohmic resistances 128 and 129 and one of the external line 102 approximated adapted artificial line 130, whereby the signals from the transmitter microphone 131 the extension generated current fluctuations according to the principle of the Wheatstone bridge accordingly kept away from the amplifier 126. '

The circuit shown in Fig. 4 shows that the extension 107 through the line

139 and switch 110 with the trunk line 101 is usually connected, i.e. without switching on the amplification device, however, the extension 108 over the line

140 and switch 111 with the trunk line 102 using the amplification device 126. The consultation switch is located in extension 107 that is usually connected 121 in the middle position, so that the circuit at this point is the known Circuit corresponds. If you have a query, switch 121 is thrown down, whereby the entire speech system is then connected to the inquiry line 119 and ■ the call organ 113 responds to the exchange. In the one with the trunk 101 through the switch 110 further connected standing . Line 139 is connected to the resistor 138 as a bridge, so that the Current flow from the central microphone battery 142 is maintained and in the known, however In the drawing for the sake of clarity, the final character is suppressed in the office because of the manner not shown in detail will.

The inquiry switch is in extension 108 122 for the purpose of switching on the amplification device 126 all the way up, making the microphone 131 immediately to line pair 140 and remote handset 143 to the inquiry line pair 120 is connected. The inquiry lines 119, 120 of all extensions 107, 108 are via the normally closed contacts 144 and 145 each, one Relay 146, the purpose of which is given below, led to a pawl 147, where it is connected to the reinforcement devices by means of a plug 148 or 149 Transformers 150 or 151 in connection can be brought. Plugs 148 and 149 are the '102 and' trunks 101 permanently assigned, so that every secondary · ■ '■ callback line 119, 120 with the

Claims (6)

Reinforcement device 125, 151 or 126, 150 of each exchange line 101, 102 arbitrarily connected can be. In Fig. 4 is the for ; Amtsleitüng 102 plug 148 belonging to the The jack 147 belonging to the extension 108 is plugged in, so that the extension telephone 143 is directly connected to the transmitter 150 of amplifier 126 is connected. As long as the relay 152 is deenergized, the Amplification device 126 according to the basic circuit shown in FIG. 3 with the Line 102 is connected, and extension 108 receives the incoming voice streams reinforced. ^; While the extension switch 122 is in the uppermost position shown and the plug 148 is in the pawl 147, flows from the battery over the two halves of the secondary coil 154 of the transformer 150, both plug lines, the windings of the relay 146, the line pair 120 and both The handset 143 winds a stream and back over the earth. : The windings of the relay 146 are now arranged in such a way that the relay 146 is excited by this parallel flow of the current through both windings, its armature is attracted and the part of the inquiry line leading to the caller organ 114 behind it is switched off. . If the switch 122 of the extension 108 then moved to the lowest position for the purpose of a query, the Disconnection of the earthed receiver 143, the relay 146 de-energized and via 144, 145 a connection of the line 120 with the call organ 114 and the jack 116 made, so that queries can proceed unhindered in the usual way. When the long distance call is resumed, the switch 122 is in the uppermost position brought back, the relay 146 re-energizes its armature and the booster is; back in operation. The described arrangement of the amplifying device in a circuit for Central battery operation is only available as an execution. view example; with analogous The arrangement is also easily changed for central units with single-battery operation apply. Likewise, the type of compensation circuit used and the amplifier system for the present invention, irrelevant. Instead of the trunk lines marked 101 and 102, you can , of course, other telephone lines from private individuals or 'authorities come in if they do come into question for traffic with loudspeaker amplifiers; in the same way can the inquiry lines 119, 120 by others, from the call stations 107, 108 to the central switch leading lines, e.g. B. those for the separate call of the official and private workspiatez etc. are replaced if they are to be usable for the purposes of the invention. The essence of the 'invention becomes further not affected if the connection between the return line (e.g. 120) and the Gain transformer (e.g. 150) different than is carried out, e.g. B. with manually or independently operated switches. If the participant ^{wants to switch off the \ T} more, he puts the T key in the working position in which it remains. The effects are described earlier. Instead of arranging a special key T , the existing changeover switches 121, 122 can also be provided with a special position in which the same grounding as with the key , T is achieved. · Since extensions are often connected to trunk lines, it is necessary that imbalance be avoided in order to avoid noise. Such an irregularity can be seen in the circuit of FIG. 3 in the fact that when the button T is pressed, the wire of the line pair 140, which runs over the contact 152 °, is short-circuited, i.e. only one winding of the relay 152 on the exchange line wire iO2 ^fi is present. The circuit according to FIG. 5 avoids this; it is completely in equilibrium whether the amplifier is on or off. The equilibrium is achieved in that the supply battery is grounded in the middle via an auxiliary battery and the switch-off button is applied in the middle of the secondary winding of a transformer /. The subscriber microphone 13 flies in the circuit for the excitation (of the relay 146 in series with the primary coil of the transformer /. The relay 152, as in Fig. 3, is a differential relay which is not energized as long as the key T is not pressed After pressing the key T to earth, a current flows from earth , via central battery B ₁ , branch battery B _s , 140, /, T, earth and another current from earth, battery B ₁ against the small battery B ₂ , Ι52 ^δ , 129, 152 ° 14ο ⁶ , J, T, to earth The latter current has the opposite direction as before pressing the T button, the relay τ 52 will therefore respond and flip all of its contacts, thereby switching off the amplifier. ■ Patent claims: i. Circuit arrangement for. Telephone systems with an amplifier that can be switched on and off by the subscriber in the switchover point, characterized in that by means of facilities at the subscriber station, the optional switching on and off of the amplifier via those already available for normal speech communication Lines (speech, inquiry, group call, etc. lines) enabled during an existing call will. ■ 2. Circuit arrangement according to claim i, characterized in that as Devices for switching the amplifier on and off such buttons or switches are used for the Ordinary speech communication (as inquiry, flickering etc. buttons) already exists are. 3.. Circuit arrangement according to claim ι and 2 with inquiry or Signal line, where the. Inquiry or The special signal lines to the amplifier circuits are used, characterized in that the devices (T, Fig. 4) at the subscriber stations which are used to selectively switch the amplifiers on and off during the call are connected to the lines (140, 140, Fig. 4) are switched on, while the amplified incoming speech streams ο leading lines (120, Fig. 4) to Switching from one voice network (Ί01, 102) to the other voice network (115, 116) serve. 4. Circuit arrangement with provided in the switching point amplifiers and with contacts at the subscriber stations, through which connections with the Umschaltesfelle and via this established and separated, and signals are given to the switchover point, characterized in that the same contacts (contact of the Hörhakensl, button At ) cause the amplifier (Vsi) set up in the switchover point to be switched on and off by means of an operation that deviates from the known type of use (hang up the receiver and leave it lying there) (hang up the receiver and immediately pick it up again). 5. Circuit arrangement according to claim ι and 4, characterized in that that for the transmission of the switching measures used to switch the amplifier on and off from the subscriber station After the switchover point, only the two speech wires are used. 6. Circuit arrangement according to An • Spruch i, 4 and 5, characterized by two relays (S and X) lying in the feed circuit of the subscriber station, which can be optionally excited and de-excited by the subscriber, whereby by switching on delay relays (V and W) through the different time ^{values 1} (slow and fast pressing of the At button) of the different uses of the station contacts one or the other "effect: is achieved." In addition 3 sheets of drawings