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Scientists Produced Technology that Turns Everyday Objects in FM-radio Stations

Imagine that you are sitting and waiting for someone in the car, and the poster of your favorite group has caught your eye. What if you can just tune up the radio station in your car, in such way, that you become acquainted with the creation of this group? Or passing by the street you see the poster on a bus stop? What if it could send on your smartphone the reference of buying the tickets with a discount or give the information about the venue of the event?

The new technology has been produced by engineers at Washington University embody, the idea of intelligent posters, in reality, permit them to contact directly with smartphone and radio in the car. It is possible due to back radiation

Produced by scientists the system of back radiation uses the external radio signals of low power for transmission messages from direct objects on the smartphone. The information is sent by way of reflection the radio signals from environment due to its minimum power consumption is achieved.

The structure of radio signals allows superimposing original signal on back radiation that leads to the additional frequency shift. This change can be decoded as an audio signal on enough HF-receiver fixed in cars and smartphones. If the technology receives development compatible, afterward it will be successfully used not only for intrusive advertising, chase or targeting but also for more useful things.

The technology receives signals from the broadcasting tower, but the smart poster or shirt use low-power reflector for signal operation in such way that it codes needful tone or data on the upper range of broadcasting and send "message" on idler frequency of HF-receiver smartphone.

Our system doesn't make noisy waves on occupied FM-frequency – we send our message on next to, that isn't used. "So that, we won't prevent from broadcasting news or your favorite music," – marks docent of the department of computer sciences, engineering and electrical engineering of Washington University Joshua Smith.

The team of scientists suggests three ways of broadcasting the voice signals in the way of back radiation: overlying new data over existing signals, using unoccupied stereo frequencies or using the connection between two smartphones to decorate the message.

Besides posters, the technology can be used for the production of fashion clothes, which can transfer the information of body state to the mobile device. Advertisement, hoarding on a bus stop, can send digital content about local sights, road signs – transmit the name of crossroad or inform when it is dangerous to cross the street.

During testing the scientists use the technique of back radiation for creating "the singing poster", which broadcast the music of Simply Three for the smartphone in a distance of 4m and radio set in cars in 18m radius. Then scientists tried to repeat the same, but with clothes. The test showed: if you use conducting threads in the cotton shirt, surrounding radio signal will give the information on the smartphone with a speed of 3.2 kilobits per second.

In both demonstrations, the general of power consumption system of back radiation is 11mk/w. So that, in future you can provide power to small lithium or solar batteries.

In future such technology with little power can be used, for example, for Internet goods or the production for sportswear from smart fabrics with the sensor of monitoring and biometric data retrieval, which will transfer data to mobile devices.

However, not everyone can use such device. So that, Norwegians won't be able to wear the smart shirt – this country has refused of broadcasting in 2017. Norway switched to digital broadcast in 1995 and after 22 years entirely occupied the place of FM.

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