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It is important for sonar systems to distinguish the submerged source from the surface one. Current approaches based on matched field processing, mode scintillation and mode filtering require either precise knowledge of the ocean environment parameters or densely populated hydrophone arrays, and become problematic in practical use. Current waveguide invariant based method, deriving the distribution...
Laser vibrometry is used to assess tissue motions induced by orthogonal-frequency pulses and binary pulses. The tissue motions in a swine liver is induced by ultrasound radiation force and measured by a laser vibrometry. The displacements of tissue motion induced by the orthogonal frequency pulses are higher than that of binary pulses from 3 dB to about 10 dB from 700 Hz to 900 Hz with a reduced excitation...
Composed vibration pulses are developed to generate ultrasound radiation force for stimulating vibrations in a tissue region with preferred spectral distributions and increasing specific vibration harmonics when the peak radiation power is limited. The new vibration sequence has multiple pulses in one fundamental period of the vibration. The pulses are sparsely sampled from an orthogonal frequency...
A gradient vector driven variable step size least-mean-square (GVD-VSS-LMS) algorithm is proposed in the context of under-modeling acoustic echo cancellation (AEC). The cost function is the mean square error. The gradient vector which takes into account the under-modeling noise and ambient noise is derived by differentiating the cost function with respect to the weight vector of the adaptive filter...
In this paper, we proposed a variable step-size normalized least-mean-square (VSS-NLMS) algorithm in the context of acoustic echo cancellation (AEC), taking into account the under-modeling and double-talk scenarios simultaneously. The recursive relation for updating the tap-weight vector was derived, and the robustness of the algorithm was analyzed. The proposed algorithm requires neither any addition...
Vibro-acoustography (VA) displays the vibroacoustic response of the object (tissue) induced by two intersecting ultrasound beams of different frequencies. VA image of a given object may vary depending on boundary conditions. Such variations are attributed to the reverberation of the sound emanating from the object in the acoustic environment of the experiment. This effect can be explained in terms...
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