Untitled record

AUSTRIAN © Int.Cl³.: H04M 015/00 H04L 009/00

PATENT OFFICE HÜ4Q 003/70 © AT PATENTSCHRIFT © Nr.373 745 © Patent owner: KAPSCH AKTIENGESELLSCHAFT WIEN »AUSTRIA © Subject: SYSTEM FOR CENTRALIZATION AND EVALUATION OF THE

IDENTITY OF SUBSCRIBER OR BZW. DATA CONNECTION DEVICES IN TELEPHONE OR BZW. DATA SYSTEMS © Addendum to Patent No.

© Elimination from:

@ ® Registered: 1982 04 28 »1654/82 © Exhibition priority:

©©© Union priority:

© Start of patent period: 1983 06 15 Longest possible duration:

© Issued: 1984 02 10 © Inventor: KERSCHBAUMER OTHMAR

VIENNA, AUSTRIA TELLAR CLAUS DIPL.ING. VIENNA »AUSTRIA © Dependence:

AT 373 745 © Pamphlets considered to delineate the prior art:

DE-AS 2253275

Nr.373745

In telephony or data technology, telephone or data systems can be assigned the task of starting special program sequences in the central part of the system in response to corresponding input procedures of access users via different connection terminals. To activate these program processes, however, a special access authorization is required. This purpose is the assignment of an identity code for each authorized terminal user: by the transmission of this identity code to the control center can be triggered in this particular data processing.

Known devices that serve the identification of a system user, usually have the form of cards that carry a code that is detected by optical, magnetic or mechanical readers and fed to a processor for evaluation. Furthermore, from DE-AS 2253275 an identification method is known in which a to be galvanically connected to the system code card is used, which contains a read-only memory as a code carrier and an electronic circuit, with the help of which the code card can correspond to a central processor.

The described Kodeträger must be plugged into an opening of a reader so that they can be read by means of suitable sensors or contacts. Therefore, systems working with such code carriers are not only prone to breakdown by contamination, but they can easily be maliciously disturbed.

In another identification method known from DD-PS No. 1336446, which is intended for identifying persons, goods or animals passing through a detection zone, a code carrier with an electronic circuit is used, which is connected to a coil in an oscillating circuit of an inducing transmitter field supplied with operating voltage. The code transmission takes place from a read-only memory built into the code carrier by modulation of the inducing field via the same coil or via a second coil. In this method, it is necessary that either the transmission or supply energy for the Kodeträger is permanently available or is turned on by additional means, if necessary, manually or automatically. A transceiver, in which this identification method is to be applied, would therefore have to be supplied either permanently with a relatively high quiescent current, which would mean a considerable outlay for battery supply, or the transmitter would have to be switched on via galvanic contact or a suitable sensor as needed , but from which an increased susceptibility to interference and / or, depending on the sensor used, Again, a significant quiescent current would result. Moreover, the transmitter enable would require additional effort or manipulation.

In systems of the type described in the introduction, in which, on the one hand, the quiescent current should be kept low and, on the other hand, the expense of limited use of the transmitter should be avoided, as is the case in particular with telephone systems with power supply from the subscriber loop, an identification would be of leads with the last-mentioned or similar code carriers which do not require a reading device with an insertion opening, For the reasons described therefore practically not possible.

The invention is now concerned with the task of designing a system of the type indicated initially in such a way that it allows identification of terminal users using code carriers that do not require a reader with an insertion, but free from the disadvantages of either permanently or by an additional effort or additional manipulation only in case of need induced operating power supply of a transmitter is.

This object is achieved in that the Kodeträger, as known per se, includes a resonant circuit with a coupling coil, that by means of this coupling coil arranged in the terminal terminal, incomplete and therefore normally not oscillating oscillator can be supplemented by approximation of the Kodeträgers to a vibratory oscillator, in that a coding device with power supply from the resonant circuit energy is connected to the resonant circuit of the code carrier in a manner known per se, that the coding device retroactively modulates the oscillator oscillations, preferably in the form of sequential blanking intervals, according to the identity code, and further in the terminal device to the oscillator

An identity code signal converter is connected with which the identity code signals modulated on the oscillator oscillation are convertible into a signal form compatible with the transmission conditions on the subscriber line or in the data channel.

According to the invention, therefore, the full operation of the system code carrier receiver is achieved in that by approximating the code carrier to the inactive inoperative oscillator this is supplemented to a vibratory oscillator, wherein the resulting oscillator oscillation is modulated in the form of sequential blanking intervals according to the identity code; the thus obtained identity code signals are brought in the terminal device by means of a converter circuit in a compatible with the transmission conditions of the subscriber line or the data channel waveform and evaluated in the control center. If there is a positive evaluation result regarding the identity of the terminal user, it is then possible to start any data processing sequences.

The technical progress achieved with the invention over punched cards or magnetic card reading systems and optical and mechanical key systems is that the reliability against replication and disturbing pollution is significantly increased and that no maintenance-intensive reading devices are needed. On the other hand, the invention allows over that in DD-PS no. 136446 described identification system as a result of the use of an oscillator receiver with a very small quiescent current only practical use in a terminal terminal with power supply from the line without additional power supply or switch-on. For this reason, results in inactive behavior of the identity code receiver and no attenuation of the rest of the circuit of the subscriber or data terminal. In addition, results in a telephone system according to the invention by a double utilization of existing for the election process to the control center of the terminal devices an economic advantage.

With reference to the drawings, the invention will now be explained in more detail. Fig.l shows in the form of a block diagram all necessary for the inventive system functional units. 2, the signal sequences occurring during active operation of the code carrier-receiver system are shown in fragmentary form.

In Fig.l three blocks can be seen, which in the order of signal flow, a donor -G-, a telephone set -TA and a telephone center -TZ- represent. The encoder -G acts as a means of identity and is already known in its essential features.

In the telephone set -TA-, in addition to the usual elements such as the speech circuit -SPS-, a multi-frequency method selector -MFV-W- and a handset -HA-, a receiver -E-, which is its supply voltage from the subscriber line -TL - receives.

The receiver comprises a pulse generator -IG-, a demodulator -DM-, a control part -ST- and a circuit unit described below, which can be supplemented to an oscillator -O-.

In the collector circuit of a transistor -T- is a resonant circuit formed of a coil -LS- and a capacitance -CS-, which couples the base of the transistor in antiphase via a feedback winding -RK-. A current control diode -DI- and a resistor -R- form a voltage divider which keeps the base voltage at rest just below the base-emitter threshold voltage. As a result, an extremely low collector quiescent current is achieved. A coupling coil -KE- in the emitter circuit acts as negative feedback and prevents unwanted oscillation of the circuit. If one now approaches this coupling coil -KE- the coil -LG- of a resonant circuit -LG-CG-, which has the same resonant frequency as the resonant circuit -LS-CS- in the collector circuit of the transistor -T-, then the damping effect of the coupling coil -KE - canceled and the oscillator -0- oscillates at its resonant frequency.

The oscillating circuit coil -LG- to be approximated with a capacitance -CG- constitutes a resonant circuit and is located in the -G- sensor. The supply voltage for the encoder electronics -EG- is removed in a known manner from the resonant circuit -LG-CG-, rectified by diodes -Dl and D2- and stored in a capacitor -C-.

Nr.373745

FIGS. 2a, 2b and 2c show pulse sequences that can be taken from the points a, b and c in FIG.

From the pulse generator -IG- in the receiver -E- come, as shown in Figure 2a, sync pulses S and short clock pulses TI .... Tn. With these pulses, the oscillator -0- is modulated, so that in the oscillator oscillation of FIG. 2c blanking gaps arise which synchronize or control the encoder electronics. With the clock pulses is in the encoder electronics, for example a counter is clocked, which in a known manner, depending on its respective state, via a programmable code device pulse-shaped, for example, in Fig. 2b shown code signals KO, K3, K4 supplies. These code pulses additionally modulate the oscillator -0- as shown in FIG. From the thus modulated oscillator oscillation, the code pulses are recovered in the demodulator -DM- and fed to the control part -ST-. There, they are prepared so that it can be controlled directly the multi-frequency dialing device -MFV-W- of the telephone set. In this way, the stages -DM, ST and MFV-W- form a code signal converter and the code pulses arrive in the form of audio frequency signals, as they are otherwise required for the dialing process, via the subscriber line -TL- in the telephone center -TZ-.

In the central office, the code pulses arrive via a subscriber circuit -TS- and an only schematically indicated switching matrix -KF- into a receiver -MFV-E- for the multi-frequency dialing method. A processor -PR- which provides for the control of the telephone exchange now compares the code received from the receiver -MFV-E- with the identity code stored in an associated code memory -KS1 .... KSn- and gives the user the coincidence of it assigned authorization free. The code memory -KS1 .... KSn- is a subsection of the main memory -HS-.

Since the dialing information of the identity code signals does not differ in kind and, moreover, both pass the same transmission path, each code to be transmitted from the control section -ST- in connection with the DTMF dialing device in the telephone set is preceded by a special identifier. Thus, the processor -P- can recognize whether it is a dialing or an identity code transmission.

The input of the identity codes into the main memory -HS- is such that an operator telephonically requests a telephone user to be detected to approach his transmitter -G- of the receiver coupling coil -KE- installed in the telephone set. Now, by appropriate manipulation of the operator at a terminal TE connected to the telephone central station -TZ-, the identity code programmed in the transmitter is transferred to the memory -HS-. In addition, the name and the type of authorization of the user are entered in the memory. This ensures that an example only authorized user can not make long distance calls, no matter what device he telephones.

After identifying the user and not only the subscriber line in this method, an individual billing can be made, regardless of which device is called. As usual, the documentation is made via a printer -DR- or a magnetic tape station -MS-, which are connected via an interface -IF- to the processor -PR-.

Among other things, a built-in clock -U- also makes it possible to use a computer system that is also connected via the interface -IF- to the entire telephone system for time recording, as is otherwise possible, for example, via time clocks or special time recording systems.

The described embodiment is a processor-controlled telephone system. Of course, the inventive type of user identity determination is also applicable in data systems.