Blaupunkt-werke Gmbh

Karl-Peter Strauss

Jurgen Kasser

Peter Seibold

Upon unauthorized removal of a car radio (2) from the chassis (C) of a car, a memory (5) which has a code stored therein is changed and inhibits operation of the car radio. The memory is retained in a predetermined memory state either by continuously receiving data inputs, for example from a potentiometer slider of a potentiometer (6), or data entered into an RAM energized only upon being properly connected in the vehicle. Alternatively, a user may enter a code, for example by operation of station selector buttons (4) of the car radio (2), and upon operating a set code switch (9), which code is destroyed upon removal of the radio, or upon failure to enter the correct code from time to time. The selected code can be encrypted by a preset encrypting memory chip, for example within the memory (5), and the encrypted code displayed, with only the manufacturer knowing the encrypting data, and releasing the encrypting data only to an authorized person, thereby permitting continued use of the radio by the authorized person even though the code word may have been forgotten.

Security system and method for electronic apparatus, particularly car

The location coordinates, as well as the transmitting station frequencies, of stations that broadcast the same programs by network arrangements or otherwise, are stored so that when a particular program (network) is selected, all these stations broadcasting the same program as a station being listened to which are not more than a prescribed maximum distance from the station being listened to, may be listed in a table in a working store. While a particular station is being listened to, therefore, continuous checking of the station being listened to with other stations broadcasting the same program for relative reception quality can be carried out automatically while a station is being listened to in a moving vehicle, without taking into account the signals broadcast by stations that are too far away. As soon as some other station broadcasting the same program is found to provide better reception, it is automatically tuned in, and from then on the distance criterion is referred to the location of the new station, a new set of stations for signal comparison is selected and the comparative signal checking process is continued automatically.

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Hildesheim, Germany

Karl-Peter Strauss