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Security system and method for electronic apparatus, particularly car radios or similar automotive audio equipment
| Details |
Inventors: Seibold, Peter; Strauss, Karl-Peter;
Assignee: Blaupunkt-Werke GmbH (Hildesheim, DE)
Primary Examiner: Swann, III; Glen R.
Assistant Examiner:
Attorney, Agent or Firm: Frishauf, Holtz, Goodman, Woodward
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. |
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DETAILED DESCRIPTION A microprocessor 1 is incorporated as part of a car radio shown, schematically, only in block form.
The microprocessor can carry out various functions in the car radio, for example digital tuning thereof.
All components not necessary for an understanding of the present invention, and forming part of the car radio, may be considered to be within the block 2.
The microprocessor 1 and the components of the car radio 2, of course, are interconnected as shown.
An alphanumeric display 3 is coupled to the microprocessor.
The alphanumeric display 3 may, for example, be of the light emitting diode (LED) or of the liquid-crystal display (LCD) type.
It may, for example, indicate the then selected station by frequency, and other functions or operating characteristics of the radio which have been commanded, for example if a tape thereof is in an operating or fast-winding mode, indication of time of day, whether the radio is tuned to amplitude or frequency modulation stations (AM, FM) or the like.
The operating components, for example pushbuttons or the like, are merely illustrated schematically as a station selection control panel with, for example, five pushbuttons.
A non-volatile electrically alterable or erasable memory, that is, an EAROM 5 is coupled to the microprocessor.
The station selector controls, of course, are also coupled to the microprocessor.
In accordance with a feature of the invention, a potentiometer 6 having a slider is coupled to a source of electrical voltage 8, for example derived from the car, and the slider of the potentiometer 6 is then coupled through an analog/digital (A/D) converter 7 to the input of the microprocessor 1 through a junction or terminal 16.
The slider of the potentiometer 6 is coupled to an elastic reset arrangement which is so designed that, if the radio is removed from a support, for example a well within the dashboard of a car, the potentiometer position of the slider will change.
The coupling of the slider to the chassis C of the car is schematically indicated by the broken line 6a, forming a mechanical connection
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