| 摘要 |
<p>The present invention relates to a method in a sending device for sending information to a receiving device. The sending device is adapted to emit electro magnetic radiation with different wave lengths. The method comprises sending electro magnetic radiation of a norm wave length to the receiving device and sending electro magnetic radiation of a second wave length to the receiving device. The difference between the first wave length and the second wave length per time unit represents information to be sent to the receiving device. The present invention also relates to a computer program for performing a method of sending information, a sending device, a method for receiving information, a receiving device and a computer program for performing a method of receiving information.</p> |
