Bandingkan kaedah

	Holografi Akustik	Pembentukan rasuk
Bidang	Akustik	Akustik
Keluarga	Process / pipeline	Process / pipeline
Tahun asal	1985	1988
Pengasas	James Maynard, Earl Williams, Yongjian Lee	Van Veen, Barry Buckley
Jenis	Sound field reconstruction method	Directional audio array processing
Sumber perintis	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.
Alias	NAH, near-field acoustics, sound field mapping, acoustic imaging	beamformer, spatial filtering, microphone array, phased array
Berkaitan	5	5
Ringkasan	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.