A system for using a watermark embedded in an audio signal to remotely control a device. Various devices such as toys, computers, and appliances, equipped with an appropriate detector, detect the hidden signals, which can trigger an action, or change a state of the device. The watermarks can be used...http://www.google.com.au/patents/US8106744?utm_source=gb-gplus-sharePatent US8106744 - Remote control signaling using audio watermarks
