The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
권호 표지

High Directivity Sound Beamforming Algorithm

방향성이 높은 사운드 빔 형성 알고리즘

  • 김성우 (연세대학교 디지털 신호처리 연구실) ;
  • 허유미 (연세대학교 디지털 신호처리 연구실) ;
  • 박영철 (연세대학교 멀티미디어 신호처리 연구실) ;
  • 윤대희 (연세대학교 디지털 신호처리 연구실)
  • Published : 2010.01.31
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Abstract

This paper proposes a technique of sound beamforming that can generate high-directive sound beams, and this paper also presents applications of the proposed algorithm to multi-channel 3D sound systems. The proposed algorithm consists of two phases: first, optimum weights maximizing a sound pressure level ratio between the target and control acoustic regions are designed, and later, the directivity of the pre-designed sound beam is iteratively enhanced by modifying the covariance matrix. The proposed method was evaluated under various situations, and the results showed that it could provide more focused sound beams than the conventional methods.

본 논문에서는 스피커 어레이를 사용하여 높은 방향성을 가진 사운드 빔을 형성하는 알고리즘을 제안하고, 제안된 알고리즘을 멀티 채널 3D사운드 시스템에 적용하는 방법을 설명한다. 제안된 알고리즘은 두 과정을 거친다. 첫 번째 과정에서는 표적 지점과 제어 영역간의 음향 파워 비를 최대화 하는 최적 빔 형성 계수를 구하고, 다음 과정에서는 상관행렬을 조절해 가면서 사운드 빔의 방향성을 반복적으로 향상시킨다. 여러 가지 상황에서 제안된 알고리즘의 성능을 평가하였으며, 실험 결과는 제안된 알고리즘이 기존의 방법들에 비해 더 높은 방향성을 갖는 사운드 빔을 제공함을 보였다.

Keywords

References

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