Silicon Cochlea Mimics Human Hearing

Cameras and audio equipment are getting better all the time, but mostly through brute force: more pixels, more sensors, and better post-processing. Mammalian eyes and ears beat them handily when it comes to efficiency and the ability to only focus on what’s interesting or important. Neuromorphic engineers, who try to mimic the strengths of biological systems in manmade ones, have made big strides in recent years, especially with vision. Researchers have made machine-vision systems that only take pictures of moving objects, for example. Instead of taking many images at a steady, predetermined rate, these kinds of cameras monitor for changes in a scene and only record those. This strategy, called event-based sampling, saves a lot of energy and can also enable higher resolution. One example is a silicon retina made by Tobi Delbrück of the…


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