Results 241 to 250 of about 7,499 (273)
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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.
Zhan Hao-ke +2 more
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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. H. Kil, D. W. Tufts, R. R. Slater
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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
Bjorn A. J. Angelsen, Ole Martin Brende
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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
Bjorn A. J. Angelsen, Ole Martin Brende
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Reverberation characterization and suppression by means of principal components
IEEE Oceanic Engineering Society. OCEANS'98. Conference Proceedings (Cat. No.98CH36259), 2002We apply the principal component inverse (PCI) method of rapidly adaptive interference suppression to the problem of separating the strong components of reverberation in an active reverberation experiment. A best low-rank estimate of a reverberation return is extracted by decomposing the returns into short duration subintervals over which the signal is
D.W. Tufts, T.A. Palka
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Suppression of reverberations at fiber tips for optical ultrasound sensing
Optics Letters, 2020Fabry–Perot-based ultrasound sensors at fiber tips have performed high sensitivity and immunity of electromagnetic interference with a relatively compact size. Nevertheless, the reverberation at fiber tips causes a strong noise that degrades the sensing capability.
Xiangdong Ma +6 more
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The reverberation suppression in wideband diver detection sonar
2014 Oceans - St. John's, 2014The reverberation suppression is the foundation of target detection in diver detection sonar. The reverberation caused by the sea bottom is generally strong. Conventional methods with only amplitude cannot remove these reverberations completely because of the random temporal fluctuation of the signal amplitude, which causes false alarms especially in ...
Ji Yongqiang +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.
Kun Yan, T.Z. Zhou, S.D. Zhao
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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.
John Mourjopoulos, Alexandros Tsilfidis
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On the application of reverberation suppression to robust speech recognition
2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2012In this paper, we study the effect of the design parameters of a single-channel reverberation suppression algorithm on reverberation-robust speech recognition. At the same time, reverberation compensation at the speech recognizer is investigated.
Armin Sehr +3 more
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Reverberation characterization and suppression by means of principal components
The Journal of the Acoustical Society of America, 1994A method of reverberation suppression and characterization, called the principal components inverse (PCI) method, has been used to separate strong components of the reverberation from the observed data of an active sonar reverberation experiment. The number of principal reverberation components needed to represent these strong components seldom exceeds
Donald W. Tufts, Richard R. Slater
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