Results 231 to 240 of about 7,499 (273)

Dynamic consensus-building between neocortical areas via long-range connections

Javadzadeh M, Schimel M, Hofer SB, Ahmadian Y, Hennequin G.   +4 more
europepmc   +1 more source

Broadband DOA Estimation by Beamforming with Suppression of Reverberation

2008 Congress on Image and Signal Processing, 2008
Acoustic signal processing in shallow water environments is a challenging problem because of the presence of reverberation. Based on some models of reverberation, data from sensors array is pretreated to suppress reverberation. Considering reverberation as a sum of echoes of transmitted signal, the principal component inverse (PCI) algorithm is ...
Xuan Li, Xiaochuan Ma, Chaohuan Hou
openalex   +3 more sources

A Hydrophone Perturbation Method for Reverberation Suppression [PDF]

Journal of Information and Computational Science, 2014
Under the shallow sea condition, bottom reverberation is the main background noise. Especially the bottom and the buried targets echo are weak and signal-to-reverberation ratio is very low. So it is an important problem that how to improve the signal-to-reverberation ratio. This paper presents a method which is Perturbation Iteration Method. The method
Minghui Zhang, Han Rongrong, Hui Sun
openaire   +1 more source

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Suppression of oceanic reverberation by subspace methods

The Journal of the Acoustical Society of America, 2008
Acoustic signal processing in shallow water environments is a challenging problem because of the presence of reverberation. Based on some models of reverberation, data from sensors array is pretreated to suppress reverberation. Considering reverberation as a sum of echoes of transmitted signal, the principal component inverse (PCI) algorithm deletes ...
Chaohuan Hou, Xuan Li, Xiaochuan Ma
openaire   +2 more sources

Geometric comb waveforms for reverberation suppression

Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers, 2002
The major problem for sonar systems operating in shallow water is reverberation from the ocean bottom. A new class of waveforms is described which combines high range resolution with excellent Doppler properties for detecting moving targets in stationary reverberation. The waveforms consist of multiple simultaneously transmitted CW tone pulses.
Hung Lai, Henry Cox
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Sand dune reverberation and its suppression

The Leading Edge, 1998
When conducting seismic exploration in desert areas, we find a strong reverberation between the sand dune surface and the desert floor — a similar situation occurs between the water surface and the sea floor. The reverberation as noise in onshore seismic prospecting is ignored for it does not behave regularly as in offshore cases.
Ling Yun, Gao Jun, Zhang Rujie
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Blind single-channel suppression of late reverberation based on perceptual reverberation modeling

The Journal of the Acoustical Society of America, 2011
A blind method for suppressing late reverberation from speech and audio signals is presented. The proposed technique operates both on the spectral and on the sub-band domains employing a single input channel. At first, a preliminary rough clean signal estimation is required and for this, any standard technique may be applied; however here the estimate ...
John Mourjopoulos, Alexandros Tsilfidis
openaire   +3 more sources