Peephole walls

日期:2019-03-06 08:01:01 作者:穆帮 阅读:

By Barry Fox Wireless links carrying sound and vision around the house are unreliable: low-power radio cannot get round corners, and infrared signals don’t pass through walls. But Sony has an answer (WO 01/24407). It says devices that look like front door security peepholes could channel radio waves and light between rooms, without the need for any electrical power. A small hole is drilled through a door or wall,