DE271579C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

Ve 271579 - CLASS 21 a. GROUP

KELLEY MONROE TURNER in NEW YORK.

one direction is independent of that of the other.

Patented in the German Empire on September 6, 1912.

Line dialer system)! with loudspeaker circuit are widely known in the at each Station, a wire is switched on between the receiver and the transmitter.

Of all of these types, the present invention is peculiarly different Circuit arrangement in that a confidentiality of the between two participants conducted conversation is made possible by

ίο the installation of one battery for each Loudspeaker point. From a three-pole, equipped with a sensitive microphone and remote receiver Loudspeaker circuit is the third, or battery wire, according to the invention the loudspeaker station with a place between the microphone and remote receiver of the ordinary Intercom connected to the line dialer circuit, while the other two speaker wires for the purpose of secret circuit with a jack spring that can be switched off from the line selector line and with the handset hook connected to the normal call station.

Another characteristic feature of the invention is that in systems of the present Art it is not necessary to speak directly into. The microphone, but you speaks in an ordinary tone and at a distance about the length of the telephone cord associated with the recipient and the conversation will be heard clearly and clearly.

Illustrated in the drawing

Fig. Ι a schematic view of the current flows of the usual line selector circuit, and

2 shows the circuit connections for switching on a loudspeaker in the system.

In FIG. 2 the station Si containing the loudspeaker is connected to the subscriber station P ^A by the wires ft, q, r , namely r is the transmission wire, ft is a battery wire and q is a remote receiver wire. The wires q and r are connected to wires a ² and a ^{1 of} the station P ^A via a jack A , and the wire ft is connected to the wire k between the microphone 23 and the remote receiver R. Furthermore, connections are provided to the subscriber P ^A from the station St on which the loudspeaker is arranged. to be able to call and also to be able to call this station St from the subscriber P ^A.

If the subscriber P ^{A has} a conversation with the loudspeaker station St , the following circuit is closed: From the microphone 23 via hook 30, wire q, leaf spring 80, contact 81, wire 82, remote receiver X of the loudspeaker station St, wire 83, battery S. ^{3 of} this station, wires 84, 85, leaf spring 86, contact 87, wire ft back to microphone 23.

When conducting the call from the subscriber station St equipped with the loudspeaker, the following circuit is

closed: Via microphone Y of loudspeaker station Si, wire go, contact gi, leaf spring 92, wires /, I ¹ , remote receiver R, wires k, ft, leaf spring 87, contact 86, wires 85, 84, battery B ³ back to microphone Y .

When the loudspeaker station St is called by subscriber P ^A , the following circuit is closed: Via the negative pole of battery B ⁴ , wires 84, w ³ , contact 51, wire m ¹ , leaf spring g4 of latch A, wires n ¹ , q, 80 , Contacts g5, g6, 97, wire 98 and the speaker signal S back to the positive terminal of battery B ⁴ .

If, however, the loudspeaker station Si calls, the following circuit is closed: Via leaf spring 96, contact 99, wires 100, 85, battery B ⁴ , wires 102, n ² , alarm clock 33, hook 30, wire q, leaf spring 80, contact 95 back to leaf spring 96.

However, this arrangement does not ensure the confidentiality of the conversation conducted between the loudspeaker station Si and the subscriber P ^A. To achieve this, the pawl A shown in the drawing is provided on station P ^A , which interrupts the connection to the wires a ¹ and α ² as soon as a plug is inserted while the loudspeaker is in operation. The power connections are the same as if wires r and q were connected to line selector wires α ² , α ¹ .

When one participant calls the other,

so under normal conditions the pawls A will be in their open position and the plugs will be pulled out of them, with the sole exception of pawl A, of course, which is in the working position to make the necessary connection.

If you z. B. assumes that the subscriber station P ^A wants to call a point P ^c (FIG. 1), then the subscriber P ^{A will} insert the plug in question into the hole at C corresponding to the point P ^c and depress the alarm button 17. The alarm circuit will then be as follows: From wire 0 via wire m ³ of station P ^A , leaf spring 51, wire m ¹ , busbar 13, right pawl spring of pawl C, wire C ² , line c ² , wire n ¹ of station P. ^c , handset hook 30, alarm clock 33 and wire n ² back to the second pole G of the alarm clock battery. As soon as the station P ^c receives this call, the subscriber removes the remote receiver from the hook, and the subscriber P ^A , who has lifted his remote receiver from the hook before or after the call, can now speak.

Hearing takes place via the following circuit: microphone 23 of station P ^A , remote receiver R, wire I ² , busbar 14, left pawl spring of jack C, wire C ¹ , line c ¹ , wire I ¹ of station P ^c , remote receiver R, Microphone 23, receiver hook 30, wire n ¹ , line c ² back to station P ^A , wire C ² , right pawl spring of jack C, busbar 13, wire m ¹ , leaf spring 41, wire m ² and back to microphone 23 via the receiver hook 30 and contacts 50. This current path can be used for both speaking and listening in both directions. Since all stations P of the system are set up in the same way, the description of the others is superfluous. The microphone current from a central battery is fed to the microphones 23 of the speech stations via lines t, t ¹ and choke coils 34, 34.

While a call flow from the part of the station P ^{A is} fed to the loudspeaker of the station St , a separate speech circuit for two participants in the conversation, z. B. P ^B , P ^c , are closed.

It must be regarded as a characteristic feature of the present invention that In systems of the type described, it is not necessary to speak directly into the microphone. One speaks in the usual tone of voice and at a distance about the length of the Handset cord that is connected to the receiver and the conversation is started be understood clearly and clearly.

Claims (1)

Patent claim: Line selector circuit, consisting of a three-pole loudspeaker circuit equipped with a sensitive microphone and remote receiver, which are provided in the three-pole circuit in such a way that the telephone conversation takes place in one direction independently of the other, characterized in that the third or battery wire ( j>) of the loudspeaker station (St) is connected to a point between the microphone (23) and the remote receiver (R) of the ordinary microphone station (P ^A ) of the line selector circuit, while the other two loudspeaker wires (q and r) are connected to the Lines voter line (a ¹ , a ² ) disengageable pawl springs of a pawl (A) and are connected to the receiver hook (30) of the usual intercom (P ^A ) . 1 sheet of drawings.