News for hackers. Stuff that matters.

A comment on Army computer models unveil secret to quieter small drones.

Re:Army computer models unveil secret to quieter small drones by iandanforth on Friday December 04, 2020 @07:26PM (#25310273)
Noise canceling works on the principle of destructive interference. Why can't drones add noise generating components which are just out of phase with the primary noise generating components? I assume this would lead to a loss of efficiency, but perhaps not enough to outweigh the benefits?
[ Parent | on HN ]
Re:Army computer models unveil secret to quieter small drones by ajsnigrutin on Friday December 04, 2020 @07:35PM (#25310339)
Because destructive interference in one direction is constructive interference (double the sound) in another.
[ Parent | on HN ]