Results 231 to 240 of about 432,612 (272)

Suppression of reverberations at fiber tips for optical ultrasound sensing

Optics Letters, 2020
Fabry–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, Bingxue Liu, Yiqi Cai, Donglin Jia, Bo Fu, Lijun Xu, Jianguo Ma   +6 more
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Reverberation Suppression and Modeling

1993
We 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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Electronic Suppression of Reverberation

The Journal of the Acoustical Society of America, 1967
Several 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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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.
H. Cox, null Hung Lai
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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.
Yun Ling, Jun Gao, Rujie Zhang
openaire   +1 more source

Adaptive reverberation noise delay estimation for reverberation suppression in dual band ultrasound imaging

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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Lasso-based reverberation suppression in automatic speech Recognition

2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2015
Far-field automatic speech recognition (ASR) is challenging, mainly attributed to the high reverberation in the recordings. A novel linear sparse prediction model has been proposed to estimate and suppress reverberation. This model considers reverberation as a mixture of early and late reflections of the direct signal and estimates the late reflection ...
Xuewei Zhang, Yiye Lin, Dong Wang 0013
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Space-time ODN suppressing reverberation method

2008 9th International Conference on Signal Processing, 2008
Reverberation 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, null Cai Zhiming, null Yuan Bingcheng   +2 more
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The reverberation suppression in wideband diver detection sonar

2014 Oceans - St. John's, 2014
The 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 ...
Yang Juan, Xu Feng, Liu Jia, An Xudong, Ji Yongqiang   +4 more
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Reverberation characterization and suppression by means of principal components

IEEE Oceanic Engineering Society. OCEANS'98. Conference Proceedings (Cat. No.98CH36259), 2002
We 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
T.A. Palka, D.W. Tufts
openaire   +1 more source