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Space-time ODN suppressing reverberation method
2008 9th International Conference on Signal Processing, 2008Reverberation of active sonar that resemble clutter of airborne radar has space-time coupling characteristic. Based on which, a method of space-time ODN reverberation is presented in this paper. Project matrix method is utilized to design time and space ODN filters.
null Zhan Haoke +2 more
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Sand dune reverberation and its suppression
The Leading Edge, 1998When 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.
Yun Ling, Jun Gao, Rujie Zhang
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Geometric comb waveforms for reverberation suppression
Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers, 2002The 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.
H. Cox, null Hung Lai
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The Journal of the Acoustical Society of America, 2015
The behavior of the propagation delays introduced in dual frequency band ultrasound imaging is discussed. In particular, the delay of reverberation noise components is examined. Using a delay corrected subtraction (DCS) method, it is possible to suppress the reverberation noise if the behavior of the propagation delays is known. Here, a signal adaptive
Ole Martin, Brende, Bjørn, Angelsen
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The behavior of the propagation delays introduced in dual frequency band ultrasound imaging is discussed. In particular, the delay of reverberation noise components is examined. Using a delay corrected subtraction (DCS) method, it is possible to suppress the reverberation noise if the behavior of the propagation delays is known. Here, a signal adaptive
Ole Martin, Brende, Bjørn, Angelsen
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Reverberation Suppression and Modeling
1993We apply the Principal Component Inverse (PCI) method of rapidly adaptive interference suppression and signal detection to reverberation suppression and modeling. We present preliminary results for the challenging example in which the transmitted pulse is a two-second burst of hyperbolic frequency-modulated (HFM) sinusoid sweeping from 210 Hz to 280 Hz.
D. W. Tufts, D. H. Kil, R. R. Slater
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Suppression of oceanic reverberation by subspace methods
The Journal of the Acoustical Society of America, 2008Acoustic 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 ...
Xuan Li, Xiaochuan Ma, Chaohuan Hou
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Perceptually-motivated selective suppression of late reverberation
2009 16th International Conference on Digital Signal Processing, 2009An improved spectral subtraction algorithm for suppressing late reverberation is presented. Existing spectral subtraction methods, process similarly all frames of the reverberant speech signal. This work introduces two criteria for the identification of the speech frames that do not contain significant late reverberation power.
Alexandros Tsilfidis, John Mourjopoulos
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Electronic Suppression of Reverberation
The Journal of the Acoustical Society of America, 1967Several methods for electronic processing of reverberant sound signals to suppress echoes and reverberation are discussed. Potential applications of these methods in sound reinforcement, conference telephony, and underwater speech communication are described. The implications of a recently proposed self-adaptive echo canceler [M. M. Sondhi, J.
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Methods for reverberation suppression utilizing dual frequency band imaging
The Journal of the Acoustical Society of America, 2013Reverberations impair the contrast resolution of diagnostic ultrasound images. Tissue harmonic imaging is a common method to reduce these artifacts, but does not remove all reverberations. Dual frequency band imaging (DBI), utilizing a low frequency pulse which manipulates propagation of the high frequency imaging pulse, has been proposed earlier for ...
Jochen M, Rau +4 more
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The STAP Method for Moving Sonar Reverberation Suppression
Applied Mechanics and Materials, 2015The theory of full dimension and reduced dimension STAP was introduced. Based on the physical mechanism of reverberation formation, the suppression of moving sonar reverberation and the possibility of improvement of detection performance were analyzed and discussed, and the solutions of several key steps were given.
S.D. Zhao, Kun Yan, T.Z. Zhou
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