Video cameras continue to gain widespread use, but there are privacy and environmental limitations in how well they work. Acoustical waves are an alternative medium that may bypass those limitations. Unlike electromagnetic waves, acoustical waves can be used to find objects and also identify them. Researchers used a 2D acoustic array and convolutional neural networks to detect and analyze the sounds of human activity.
from Latest Science News -- ScienceDaily http://bit.ly/2Wbm8xm
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