I have attended a seminar on Noise reduction technology of UAV (Quadcoptor). They used two things: 1. By changing blade profile of UAV propeller they have achieved 8dB reduction in noise. 2. By using phase control they have reduced noise by 6 dB. Any startup working in this domain of UAV want to know how they have achieved can contact me in DM as I have taken the screenshot of the ppt.
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