cochlea
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MIT ear-powered wireless sensor sustains its charge through sound
You wouldn't immediately think of the ear's cochlea as an energy source, but MIT knows that every mammal effectively has a pair of very small power plants because of the ionized environment. School researchers are trying to harness that energy through a new sensor that exploits the whole ear canal system. As eardrum vibrations naturally create a usable voltage from brain signals, the prototype can build enough charge in a capacitor to drive a very low-power wireless transmitter that relays the electrochemical properties of the ear and potentially diagnoses balance or hearing problems. The beauty of the system is its true self-sustainability: once the transmitter has been been jumpstarted with radio waves, it powers itself through the resulting transmissions. Energy use is also sufficiently miserly that the sensor doesn't interrupt hearing. Work is still early enough that there's a long way to go before such implants are part of any treatments, but there's hope that future chip iterations could help fix inner ear maladies, not just report on them. Something tells us, however, that the doctor won't ask us to take two dubstep tracks and call back in the morning.
MIT scientists reverse engineer the ear for ultra-broadband, low power RF chip
Researchers at MIT have developed an ultra-broadband radio chip that's faster than any existing RF spectrum analyzer, while consuming 100 times less power. The RF Cochlea mimics the neural signal processing of the human cochlea, which uses fluid mechanics, piezoelectrics and neural signal processing to convert sound waves into electrical signals which travel to the brain. "The more I started to look at the ear," said Rahul Sarpeshkar, associate professor of electrical engineering and computer science, "the more I realized it's like a super radio with 3,500 parallel channels." The team has recently filed for a patent to incorporate the chip in a universal or software radio architecture that will process a broad spectrum of signals including cellular phone, wireless Internet, FM, and other signals. Ultimately, this tech could be used to build a universal radio that could receive a broad range of frequencies. Meet Professor Sarpeshkar in the video after the break.[Via Daily Tech]
