So sánh phương pháp

	Âm ba chiều (Acoustic Holography)	Beamforming
Lĩnh vực	Âm học	Âm học
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1985	1988
Người khởi xướng	James Maynard, Earl Williams, Yongjian Lee	Van Veen, Barry Buckley
Loại	Sound field reconstruction method	Directional audio array processing
Công trình gốc	Maynard, J. D., Williams, E. G., & Lee, Y. (1985). Near-field acoustic holography: I. Theory of generalized holography and the development of NAH. Journal of the Acoustical Society of America, 78(4), 1395–1413.	Van Veen, B. D., & Buckley, K. M. (1988). Beamforming: A versatile approach to spatial filtering. IEEE ASSP Magazine, 5(2), 4–24.
Tên gọi khác	NAH, near-field acoustics, sound field mapping, acoustic imaging	beamformer, spatial filtering, microphone array, phased array
Liên quan	5	5
Tóm tắt	Near-Field Acoustic Holography (NAH) is a technique for reconstructing 3D acoustic sound fields and visualizing sound radiation from sources by measuring pressure at a dense microphone array in the near field. Pioneered by Maynard, Williams, and Lee in 1985, NAH extends holographic principles from optics to acoustics, enabling detailed acoustic source characterization, noise source identification, and acoustic field visualization that is impossible with conventional single-point or line-array methods.	Beamforming is a spatial signal processing technique that uses microphone arrays to selectively enhance sound from a desired direction while suppressing sounds from other directions. Formalized by Van Veen and Buckley in 1988, beamforming is fundamental to hands-free speech communication, hearing aids, sonar, radar, and spatial audio recording. It enables 'listening' with directional sensitivity despite using omnidirectional microphones, by exploiting time delays and phase differences between array elements.