Tripping the Light Fantastic: Visible-Light Communication  

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Jenis: Article from Bulletin/Magazine
Dalam koleksi: The Economist (http://search.proquest.com/) vol. 402 no. 8769 (Jan. 2012), page 68.
Topik: Consumer electronics; Light; Smart-phones; Wireless communications; Research & development--R&D

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Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.70 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Among the many new gadgets unveiled at the recent Consumer Electronics Show in Las Vegas was a pair of smart-phones able to exchange data using light. These phones, as yet only prototypes from Casio, a Japanese firm, transmit digital signals by varying the intensity of the light given off from their screens. The flickering is so slight that it is imperceptible to the human eye, but the camera on another phone can detect it at a distance of up to ten metres. In an age of Wi-Fi and Blue-tooth, flashing lights might seem like going back to sending messages with an Addis lamp. In fact, they are the beginning of a fast and cheap wireless-communication system that some have labeled Li-Fi. The data being exchanged by Casio's phones were trifles: message balloons to be added to pictures on social-networking sites. But the firm sees bigger applications, such as pointing a smart-phone at an illuminated shop sign to read information being transmitted by the light: opening times, for example, or the latest bargains. Yet that is still only a flicker of what is possible.

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