Student may use doppler effect for computer control

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A Swedish student has on the basis of research of Microsoft to the doppler effect developed an application with which a user can scroll through his hand to move. There are only a microphone and speakers are necessary.

The student Daniel Rapp discovered recently the research of Microsoft from 2012. He was mesmerized by the possibility without special hardware to make use of motion detection. Unfortunately, there was no code in the paper to the method, but let Rapp is not out of the field store: pretty soon knew Rapp active code to write, and he placed the application with the simple name of ‘Doppler’ on Github.

The technique works with ordinary speakers, in a frequency range that for most people is not audible, at 20kHz. As a hand, the sound waves move, the waves a little bit. The microphone picks up the difference in sound. The by Rapp developed program uses this phase difference to the screen to scroll. Rapp has the sound is also designed so that the modulating is like a theremin, an electronic musical instrument that is played by the distance between the hands and two antennas to vary.

Another application that Rapp has created is a motion detection application. In this case, is a square smaller or larger by the difference in the left and right bandwidth. Of course, he also has the ability built to scroll. The software does not offer the option to double click to the scroll direction to run.

Microsoft Research video 2012