Results 271 to 280 of about 777,330 (303)

A Hydrophone Perturbation Method for Reverberation Suppression

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
openaire   +1 more source

Spatio-Temporal Reverberation Suppression Method Based on Itakura Distance Segmental Pre-Whitening and Progressive Adaptive Binary SVD

International Conference on Signal Processing, Communications and Computing
In underwater acoustic signal processing, the overlapping presence of reverberation and target echoes within the time-frequency domain poses formidable challenges for target detection in active detection scenarios conducted from moving platforms ...
Yuan Cao, Qunfei Zhang
semanticscholar   +1 more source

Reverberation characterization and suppression by means of principal components

The Journal of the Acoustical Society of America, 1994
A 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
Richard R. Slater, Donald W. Tufts
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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
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Single-Microphone Early and Late Reverberation Suppression in Noisy Speech

IEEE Transactions on Audio, Speech, and Language Processing, 2013
This paper presents a single-microphone approach to the enhancement of noisy reverberant speech via inverse filtering and spectral processing. An efficient algorithm is used to blindly estimate the inverse filter of the Room Impulse Response (RIR). This filter is used to attenuate the early reverberation.
Saeed Mosayyebpour, Morteza Esmaeili, T. Aaron Gulliver   +2 more
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Space-time processing for suppression of bottom reverberation

Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers, 2002
The major problem for sonars operating in shallow water is the detection of low Doppler targets in the presence of severe bottom reverberation. For a modern sonar with an azimuthally omni-directional transmitter; the Doppler of bottom reverberation is proportional to /spl nu/cos /spl theta/ where /spl nu/ is the speed of the sonar platform and /spl ...
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Noise and late-reverberation suppression in time-varying acoustical environments

2010 IEEE International Conference on Acoustics, Speech and Signal Processing, 2010
We consider single-channel blind late-reverberation suppression in noisy and time-varying acoustical environments. Existing estimators for the late reverberant spectral variance (LRSV) are derived assuming the room impulse responses (RIRs) to be time-invariant realizations of a stochastic process.
Jan S. Erkelens, Richard Heusdens
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An Improved Method for Late-Reverberant Suppression Based on Statistical Model

Speech Communication, 2013
Model-based late reverberant spectral variance (LRSV) estimator is considered as an effective approach for speech dereverberation, which can construct a simple expression for the LRSV according to the past spectral variance of the reverberant signal. In this paper, we develop a new LRSV estimator based on the time-varying room impulse responses (RIRs ...
Xulei Bao, Jie Zhu 0006
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Continuous active sonar reverberation suppression for real-time processing

Chinese journal of acoustics
To mitigate the masking of weak target echoes by cumulative reverberation in continuous active sonar (CAS), and to achieve real-time reverberation suppression under the constraints of short detection windows, this paper proposes a sequential sub-band ...
Longxing Liu, Zemin Zhou, Minmo Chen, Yun Zhao, Jiahua Zhu, Weiya Xie, Chuang Xie   +6 more
semanticscholar   +1 more source

Signal-dependent constraints for perceptually motivated suppression of late reverberation

Signal Processing, 2010
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Alexandros Tsilfidis, John Mourjopoulos
openaire   +2 more sources