| 摘要 |
An access-controlled system includes a portable identification device and a control unit with which the encoded information on the identification device can be read. The control unit allows a user access to the system once the identity of the identification medium has been established. The portable identification device includes a signal generator device configured for generating a reproducible acoustic signal in a mechanical manner. The reproducible acoustic signal includes a clacking noise, a frequency spectrum of the clacking noise encoding information. The signal generator device includes a tongue, plate, and/or curved surface that folds upon an overcoming of an initial resistance, the folding generating the clacking noise. The tongue, plate, and/or curved surface springs back to an original position subsequent to being acted upon.
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