Results 241 to 250 of about 7,738 (278)

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 ...
Alexandros, Tsilfidis, John, Mourjopoulos   +1 more
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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
openaire   +1 more source

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

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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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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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
openaire   +1 more source

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 ...
Xuan Li, Xiaochuan Ma, Chaohuan Hou
openaire   +1 more source

Perceptually-motivated selective suppression of late reverberation

2009 16th International Conference on Digital Signal Processing, 2009
An 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
openaire   +1 more source

Reverberation Suppression Using Wideband Doppler-Sensitive Pulses

IEEE Journal of Oceanic Engineering, 2008
The influence of transmitted waveforms on the signal-to-reverberation ratio (SRR) of a low-frequency active sonar is analyzed both theoretically and experimentally. Reverberation experiments have been conducted during a sea trial in a littoral water environment in October 1999.
Doisy, Y, Deruaz, L., IJsselmuide, S.P. van, Beerens, S.P., Been, R.   +4 more
openaire   +2 more sources