Tag: phase

Amazon Quells Drone Noise with Anti-Noise

Phase cancellation is an interesting acoustic phenomenon. If two identical signals are 180 degrees out of phase, they will completely cancel each other out. With the eventual proliferation of delivery drones, noise will be an issue. As Amazon puts it, “the net effect of the noises generated by the unmanned aerial vehicle may be annoying at best, or deafening at worst.”   Behold: the Silent Drone. Amazon has presented a patent application “directed to actively […]