| 摘要 |
Transponders located at suitable intervals form a guide route and are activated in a wireless and contact-free manner by a transmiter/receiver unit carried by the user. This unit can be an accessory for an existing visual aid or it can be integrated into such an aid and is designed to transmit information to the user in the form of signals or synthetic speech. The information comprises coded sequences based on international protocol, enabling the unit to be used globally. |
