Innovation
Photos: Cold War ZX Spectrum clones spawned behind the Iron Curtain
Dutch semiconductor company NXP shows how its chips are being used in transport, medicine and smart metering during a tour of its research facility in Eindhoven
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.
Caption by: Tom Espiner
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