INFORMATION RETRIEVAL SYSTEM BASED ON POSITION OF THE LIGHT SOURCE

摘要

A position dependent information retrieval system dependent of the position of the light source is disclosed including a light source having a driver and an encoder. The driver and the encoder are coupled to the light source so that the light source produces a light signal modulated by the unique code modulated light signal in accordance with a predetermined signature. The system also includes a receiver having a photosensitive detector capable of detecting the modulated light signal and a decoder capable of decoding the predetermined signature. A controller is communicatively coupled to the receiver, a memory and output device. The controller is arranged to receive the decoded unique code, obtain at least one localized message in the memory, based upon the decoded predetermined signature and output the localized message using the output device.