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Device for the body-bound data transmission between two terminals
| Details |
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Inventors: Spaude, Heinz-Werner; Heuthe, Ronald; Kranawetter, Christian;
Assignee: Daimler-Benz AG (DE)
Primary Examiner: Elms; Richard T.
Assistant Examiner:
Attorney, Agent or Firm: Evenson, McKeown, Edwards & Lenahan, P.L.L.C.
The invention provides a device for the transmission of data between two terminals in which a portion of the body of a living being completes the data transmission circuit. A first terminal is to be worn by a body of a living being, and an interface is provided for coupling of data signals into the body and/or for coupling them out of the body. A second terminal has a touch-sensitive interface by way of which, in the case of a contact by the body wearing the first terminal, it couples data signals coupled into the body out of the body and/or couples data signals into the body. According to the invention, the interface of the first terminal has a first pair of electrodes which are to be arranged at mutually spaced points of the body, and the interface of the second terminal has a second pair of touch-sensitive electrodes which are to be touched by two other mutually spaced points of the body. The data signal to be transmitted is coupled by the transmitting terminal by way of its pair of electrodes as a differential voltage signal into the body, and is coupled by the other terminal as a corresponding differential voltage signal by way of its pair of electrodes out of the body. |
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DETAILED DESCRIPTION This invention relates to a device for transmission of data between two terminals, in which a portion of the body of a living being is used to complete the data transmission circuit.
Examples of the use of such data transmission devices are access systems and/or usage authorization systems which grant one or several specific persons access to spaces, technical objects or bank accounts, or which authorize the use of a usable device by only one or several specific persons.
For this purpose, such persons are provided with an individualized access or usage authorization code that must be transmitted in each case to prove authorization.
Frequently, data transmission devices used for this purpose have a mechanical code data transmission, such as for example, mechanical locking systems.
Wireless code data transmission systems, on the other hand, may use magnetic cards or chip cards, or may exchange data by radio or infrared waves.
It is known that a problematic aspect of all these systems is their vulnerability to interventions by unauthorized persons.
To increase the system security and the operating comfort, European patent document EP 0 109 184 A2 discloses an identification system of this type which is employed for proving the usage authorization of a respective user and is designed as a single-wire line system.
A first terminal is carried by a human body (for example, in the form of a wrist watch), and a second terminal is assigned to a device which is to be activated by a user.
The terminal carried on the body is constructed as a transmitter in which a usage authorization code is stored, the latter being coupled as an electric signal by way of an interface designed as a single electrode into the human body carrying the terminal.
The interface of the other terminal comprises a single-electrode sensor arrangement which contains a touch-sensitive switching element and an amplifier in parallel thereto.
The amplifier is kept activated by the switching element only when a touch contact is detected; in its activated condition, the amplifier couples the signal which is coupled into the body and contains the usage authorization code out of the body
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Finance 
