드론 장착 마이크로폰에 의한 광대역 음향 획득 기술 = On the Technology of Wide-band Audio Acquisition by Microphone attached Drone

다국어 초록 (Multilingual Abstract)

It is known that drones have many noise factors such as propeller noise and wind, making it almost impossible to acquire soundusing an installed microphone. However, if drone sound acquisition is possible, the sense of presence can be greatly improved byproviding real sound along with drone video. In this paper, we would like to introduce research trends and cases where thepossibility has been attempted to see if it is possible to overcome these difficulties. The application field aims to provide real-timerealistic media for remote tourism using drones, and for this purpose, it was decided to acquire stereo sound that provides abandwidth of 8 kHz or more. In order to obtain wide-band stereo sound, various methods including physical approach, microphoneelement approach, and signal processing approach were explored. Stereo directional microphones were mounted at a distance from thedrone propeller, noise proof filters and windscreens were used, and a DNN (Deep Neural Network) based real-time drone noisecancellation was applied. Although the characteristics of the drone noise recorded during actual drone flight were very complex andthe level was greater than expected, we confirmed the possibility of overcoming drone noise through various approaches andproviding sound service along with drone video. In fact, as a result of measuring the noise reduction performance of each approachseparately in the laboratory, a noise reduction effect of approximately 24 dB was confirmed, and through listening, the music sound,which was barely audible due to drone noise, was enhanced to a level where the music could be well perceived.