A Cylindrical Near-Field Acoustical Holography Method Based on Cylindrical Translation Window Expansion and an Autoencoder Stacked with 3D-CNN Layers [PDF]
Sensors, 2023 The performance of near-field acoustic holography (NAH) with a sparse sampling rate will be affected by spatial aliasing or inverse ill-posed equations.
Jiaxuan Wang +3 more
doaj +2 more sources
Robust Acoustic Imaging Based on Bregman Iteration and Fast Iterative Shrinkage-Thresholding Algorithm [PDF]
Sensors, 2020 The acoustic imaging (AI) technique could map the position and the strength of the sound source via the signal processing of the microphone array. Conventional methods, including far-field beamforming (BF) and near-field acoustic holography (NAH), are ...
Linsen Huang +4 more
doaj +2 more sources
A Ratio Model of L1/L2 Norm for Sound Source Identification [PDF]
Sensors, 2020 In the field of sound source identification, robust and accurate identification of the targeted source could be a challenging task. Most of the existing methods select the regularization parameters whose value could directly affect the accuracy of sound ...
Linsen Huang +3 more
doaj +2 more sources
A Sound Source Identification Algorithm Based on Bayesian Compressive Sensing and Equivalent Source Method [PDF]
Sensors, 2020 Near-field acoustic holography (NAH) based on equivalent source method (ESM) is an effective method for identifying sound sources. Conventional ESM focuses on relatively low frequencies and cannot provide a satisfactory solution at high frequencies.
Ming Zan +3 more
doaj +2 more sources
On Data Selection and Regularization for Underdetermined Vibro-Acoustic Source Identification [PDF]
SensorsThe number of hologram points in near-field acoustical holography (NAH) for a vibro-acoustic system plays a vital role in conditioning the transfer function between the source and measuring points.
Laixu Jiang +3 more
doaj +2 more sources
Sound field separation with cross measurement surfaces. [PDF]
PLoS ONE, 2018 With conventional near-field acoustical holography, it is impossible to identify sound pressure when the coherent sound sources are located on the same side of the array.
Jin Mao, Jinfu Du
doaj +2 more sources
Statistically Optimized Near-Field Acoustic Holography Using Prolate Spheroidal Wave Functions [PDF]
Shock and Vibration, 2023 Near-field acoustic holography (NAH) is an effective tool for realizing accurate sound field reconstruction in three-dimensional space on the prerequisite that appropriate elementary wave functions are selected or constructed to match the characteristics
Xuxin Zhang +4 more
doaj +2 more sources
Patch near-field acoustical holography in cylindrical geometry
The Journal of the Acoustical Society of America, 2005 Spatial discrete Fourier transform-based near-field acoustical holography is known to suffer from windowing effects since the measurement aperture is necessarily finite. The latter effect can be mitigated by using patch holography, in which the measured field is extended beyond the measurement aperture based on successive smoothing operations.
Bolton, J Stuart, Lee, Moohyung
openaire +4 more sources
IEEE Access, 2023 Source identification and sound field reconstruction using near-field acoustical holography (NAH) is particularly challenging when the measurement data are relatively fewer than the sources to reconstruct.
Laixu Jiang +3 more
doaj +1 more source
Near-field acoustic holography in conical coordinates. [PDF]
The Journal of the Acoustical Society of America, 2009 Near-field acoustical holography (NAH) techniques can be optimized if the method capitalizes on the geometry of the noise source under investigation. Helmholtz-equation least squares method (HELS) uses the solutions of Helmholtz equation in spherical coordinates as basis functions for the pressure field. HELS is an efficient NAH technique if the source
Tracianne Neilsen +2 more
openaire +1 more source