Method for controlling a computing device over existing broadcast media acoustic channels

摘要

The present invention provides a method for broadcasting a control message across an existing broadcast transport medium such as TV, Radio, Webcasts, Smart Phones/Tablets, Audio Buttons/Toys and PA/audio systems via a common acoustic channel with normal traditional broadcasts over those mediums to control computing devices, especially smart mobile devices such as smart phones or tablets. The present invention also involves a method for encoding the control message onto an acoustic wave composed of active sinusoidal frequency components selected out of monitored possible frequencies according to the concept of mathematical combinations. This encoding method is aimed at using a minimum amount of transmitted energy to get a maximum amount of data with as little reflective noise as possible.

主权项

1. A method for controlling a computing device over an existing broadcast media acoustic channel, wherein the computing device is capable of high frequency acoustic transmission, the method comprising steps of:
encoding a digital message by generating an audio signal composed of a set of high frequency components outside of a predefined frequency range; embedding the audio signal carrying information of the digital message into an audio stream; transmitting the audio stream over the existing broadcast media acoustic channel; executing an authorized application on the computing device to extract and decode the embedded digital message when the computing device is within a broadcast range of the existing broadcast media acoustic channel; the audio signal is composed of k frequency components; n frequency components within a predetermined frequency band are monitored for decoding; the digital message is encoded with the audio signal composed of any k frequency components selected out of the n monitored frequency components in accordance with mathematical combinations; during a decoding process, k frequency components having highest signal magnitudes are distinguished from the n monitored frequency components and the digital message corresponding to a combination of the k frequency components selected out of the n monitored frequency components is identified; the digital message includes a number of x bit data packets, each of which is broke into two x/2 bit data packets; the predetermined frequency band is broke into two adjacent frequency sub-bands; and the two x/2 bit data packets of each x bit data packet are encoded with frequency components within the two adjacent frequency sub-bands respectively.