They put a smartphone next to a keyboard, and they had people type, and then their goal was to use the vibrations that were created by typing to measure the change in the accelerometer reading to determine what the person had been typing.
Položili smartphone na stůl vedle klávesnice a nechali na ní lidi psát. Jejich cílem bylo pomocí akcelerometru měřit vibrace, které vznikají, když lidé mačkají klávesy, a podle toho rozpoznat, co psali.