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The car key can be tapped against a Nokia 6131 phone to transfer information between the devices. In addition, it can be fitted with a chip to enable payments at garages or to give access to buildings.
The NFC chip is powered by the point-of-sale device, rather than relying on a battery. According to Gino Knubben, the NFC car key project manager, two-factor authentication can be added to encrypt communications between the car key and a contactless point-of-sale device.
Research scientist Steven Daemen demonstrated hearing aids that use low-power chips and magnetic induction radio to communicate with each other.
With magnetic induction over a short distance, there is a low degradation of radio signal strength through the human body. This enables the hearing devices to communicate and to give a stereo effect to the wearer.
"It's important to have a bi-directional link," says Daemen. "Normal hearing devices miss a stereo effect."
Spacialisation, where sounds heard in the earphones appear to be coming from specific points in space rather than through the inside of the head, can be added via an external processor, NXP said.
Normally, near-field magnetic induction communication relies on a transmitter modulating a magnetic field, which is then picked up and demodulated by a receiver. However, the devices pictured can transfer two voices simultaneously in two directions, allowing a stereo effect.
In the devices, the two magnetic coils are tuned to resonate at a specific frequency, in this case 10.6MHz. The chip models the stereo sound on top of that frequency, according to Daemen.
Daemen told ZDNet UK "The good thing is that [the devices] are low power, but they are limited in range."
The devices operate on batteries between one and 1.4 volts over a frequency range of 7MHz to 15MHz.