Coding method for an electronic key

Abstract

Abstract In the method for coding an electronic key, a number of code numbers 1 to n are stored in the transmitter (1) and in the receiver (2). After every transmission and reception operation a new identical code number is automatically set in the transmitter (1) and receiver (2). The transmitter (1) controls via an amplifier (3) a photodiode (4) which emits a coded infrared signal (5). This signal (5) is received by a phototransistor (6) which delivers it to the receiver (2) via an amplifier (7). At the output (8) of the receiver (2) there is a signal (9), by means of which the central locking system of a motor vehicle is actuated. <IMAGE>

Inventors

• 👤 Heinz Dipl.-Phys. Preissinger
• 👤 Kurt Dipl.-Ing. Schwaiger

Bibliographic Details