DE1045469B - Circuit arrangement for telephone dialing systems for the transmission of messages from the calling party to the called party in the event of a call not being made - Google Patents

Description

The invention relates to a further development of the circuit arrangement according to the patent application S 54310 VIIIa / 21a3. This circuit arrangement makes it possible to send messages from the calling party to the to communicate the called subscriber with the help of dialing impulses if the conversation did not take place, by responding to the busy signal of the called subscriber in the last dialing level of the exchange facility or after several alarm calls, the connection of a switching means is prepared, which is dependent on of further dialing pulses to a switch located in the subscriber line a signal frequency source turns on, in whose frequency the other dialing pulses of the calling subscriber, which one in Digits correspond to the coded message, implemented and given to the called subscriber and the there be fed to an evaluation device via a receiving splitter.

The transmission of messages in coded form is quite common in telegram traffic. If a corresponding digit code is used, the proposed arrangement transmit any message. However, the coding and retransmission require a certain amount Time expenditure and are not familiar to every subscriber.

In a further development of the concept of the invention, the main application is used for the transmission of messages Suggested by the calling to the called subscriber if the conversation did not go through, that the switching means provided in the last dialing stage of the exchange system reacts to the busy signal of the called subscriber or after several alarm calls switches on a modulation device, in which the other spoken messages of the calling subscriber are implemented with a carrier frequency are sent via an electrical switch to the called subscriber and there via a Receiving switch is fed to a demodulator with a sound storage device.

The drawing shows an exemplary embodiment on the basis of which the invention is to be explained in more detail. The circuit, which essentially corresponds to the dialing system 50 of the DBP, is implemented according to the invention the switching elements and arrangements highlighted with thicker lines have been added.

After the end of a choice, a test of the desired line for free or occupied by the test relay P takes place in the usual way. In both cases, among other things, the relay G , not shown, is active, which prepares the circuit for the auxiliary relay 5 "with a contact g3 . When occupied, a further contact g4 causes the relay B to respond for telephone

Dialing systems for the transmission of

Messages from the calling to the called

if the conversation did not take place

Addition to patent application S 54310 Villa / 21a ³
(Auslegesctirift 1 035 215)

Applicant:

South German telephone sets, cable

and Drahtwerke A. G., TEKADE,

Nuremberg, Allersberger Str. 185

Dr. rer. nat. Christian Schramm,

and Curt Eichler, Nuremberg,
have been named as inventors

Line, however, the call sign transmitting relay M with its contact ml is so effective that after a certain time a thermal relay Th responds, which now switches on the relay B with its contact th. An announcement device AS is switched to the calling subscriber through the contacts bl, & 2. The usual busy signal can be cut off during the following announcement by another & contact (not shown). The following message can be issued to the calling subscriber from the announcement device: "Subscriber does not answer, please dial number 1 and speak on his tape!" If the subscriber follows this request, relay E receives a corresponding impulse and switches with his contact e3 the relay 5 finally on. Via contact si , it continues to hold itself until the calling subscriber hangs up (g3 contact). The contact dS disconnects the announcement device from the line again when relay B drops out. The calling subscriber is connected via the contacts s2 and s3 to a modulation device Mod , which operates on the output side on a transmission splitter SW . This transmission switch is located immediately in front of the inputs a / b of the dialer of the last dialing level, so that the modulated conversation reaches the called subscriber via the line Ltg. The carrier frequency Trf required for the modulation device is switched on with further contacts s4j s5

809 697/117

can correspond to a frequency of the wire radio frequency band and in a similar manner as there up to Participant is transferred.

A receiving switch EW is provided in front of the subscriber set, the high-frequency output of which leads to a demodulator DM with a sound storage device TS. The reception-side devices, such as the demodulator and sound memory, are expediently only switched on when the carrier arrives. This is achieved, for example, by a rectifier path Gl , the directional current of which causes the relay R to respond. With an appropriate arrangement, the demodulator itself can, if necessary, excite the relay R. Corresponding r-contacts take over the connection of the devices to the required supply voltages.

The invention has the advantage of using a telephone connection even when the called Subscriber set is busy or not queried due to the absence of the desired subscriber will. The transmitted message is in open language and can therefore be used without further aids be evaluated immediately.

Claims (5)

Claims: a_ 1.Circuit arrangement for telephone dialing systems for the transmission of messages from the calling to the called subscriber in the event of a call that did not materialize, in which in the last dial stage of the exchange facility on the busy signal of the called subscriber or after several alarm calls, the connection of a switching means is prepared that is dependent on further dialing pulses to a switch located in the subscriber line, a signal frequency source is switched on, the frequency of which the further dialing pulses of the calling subscriber are converted and sent to the called subscriber via an electrical switch and fed to an evaluation device at the subscriber via a receiving switch in accordance with patent application S 54310 Villa / 21a ³ , characterized in that said switching means switches on a modulation device in which the further spoken messages of the calling subscriber are converted with a carrier frequency which is transmitted to geru via an electrical switch fenen subscriber and is fed to a demodulator with a sound storage device via a receiving unit. 2. Circuit arrangement · according to claim 1, characterized in that the calling subscriber in response to the busy signal or after several alarm calls, a spoken prompt to Receiving further messages. 3. Circuit arrangement according to claim 2, characterized in that the transmission of further Messages depends on a further impulse from the calling party. 4. Circuit arrangement according to claim 1, characterized in that the carrier frequency for the modulation is a frequency of the wire radio frequency band used. 5. Circuit arrangement according to claim 1, characterized in that the receiving side Devices switched on by the received carrier or switched off after the carrier is no longer available will. 1 sheet of drawings © 809 697/117 11:58.