Results 251 to 260 of about 451,753 (296)

Generalized Coherence-Based Signal Enhancement

ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2020
This contribution presents a novel approach for coherence-based signal enhancement. An estimator for the coherent-to-diffuse ratio (CDR) is devised, which exploits the concept of generalized magnitude coherence and thus, unlike common state-of-the-art schemes, can simultaneously take advantage of more than two microphones.
Heinrich W. Lollmann, Andreas Brendel, Walter Kellermann   +2 more
openaire   +1 more source

Evolutionary Coherence of Nonstationary Signals

IEEE Transactions on Signal Processing, 2008
Coherence is a widely used measure for characterizing linear dependence between a pair of signals. For nonstationary signals, the autospectrum, cross spectrum, and coherence between signals may evolve over time. A standard approach is to divide the signals into overlapping blocks of fixed width and then smooth (over frequency) the periodogram matrix at
Ombao, Hernando, Van Bellegem, Sébastien   +1 more
openaire   +1 more source

Optimal receiver for coherent signals

Conference on Lasers and Electro-Optics, 2016
We propose a practical receiver scheme for discriminating coherent signals with the error rate unconditionally below the standard quantum limit (or shot noise). For BPSK signals the error rate goes down to the Helstrom bound.
Sych, D., Leuchs, G.
openaire   +2 more sources

Coherent Detection Signal-to-Noise

Applied Optics, 1975
General equations are derived for the signal-to-noise ratio of a coherent (heterodyne) receiver in terms of the distribution functions of the signal and local oscillator fields and the size and shape of the detector. The optimum local oscillator field distribution is identical to the signal field distribution over the detector surface. The special case
openaire   +2 more sources

Coherent color flow imaging: Velocity estimation using coherent signals

2017 IEEE 14th International Symposium on Biomedical Imaging (ISBI 2017), 2017
We present a modification to time-delay and phase-shift estimators used in ultrasound imaging methods. In this modification, we selectively eliminate covariance terms from the estimator corresponding to channel signal pairs that have low coherence. We demonstrate this modification in simulation and phantom experiments in the application of color flow ...
Jeremy J. Dahl, You Li
openaire   +1 more source

Signaling causal coherence relations

Discourse Studies, 2013
Signaling of relations is an open question in rhetorical structure theory (RST). Discourse markers are the unmistakable signals of a relation. However, it may be argued that all relations – and not only those involving discourse markers – are signaled in some way.
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Signal recovery from mixed coherent signal and noise

SPIE Proceedings, 2007
In this paper, we investigated the coherent noise in communication systems and use a method for reducing the noise mixed with the signal. We use a general model of N-signal and N-noise frequency mixing. The numerical results are shown in this paper. A proper choice of the parameters can reduce the noise at the output of the data recovery system.
Mohammad Reza Salehi, Farzin Emami
openaire   +1 more source

Coherent signal - subspace processing in a sector

Twenty-Third Asilomar Conference on Signals, Systems and Computers, 1989., 1989
The determination of the number of wideband signals impinging on a passive sensor array in the form of multiple groups (clusters), and the estimation of their directions of arrival is addressed. The idea of preprocessing by a set of orthogonal beamformers for dimensionality reduction is used to simplify wideband processing.
A. Bassias, M. Kaveh
openaire   +1 more source

Use of coherent signal dispersion for signal source association

2023
A signal source association method and receiver. A receiver can be used to detect a plurality of signals transmitted from a plurality of transmission sources. The receiver can determine amplitude and phase information for a plurality of frequency components of each of the plurality of signals.
Mueller, Jeffrey G., Loof, Joseph Lawrence, Kossler, Robert D., Pratt, Thomas G   +3 more
openaire   +1 more source

Coherence Among Climate Signals, Precipitation, and Groundwater

Groundwater, 2010
Climate signals may affect groundwater level at different time scales in different geographical regions, and those patterns or time scales can be estimated using coherence analysis. This study shows that the synthesis effort required to search for patterns at the physical geography scale is possible, and this approach should be ...
Reza Namdar, Ghanbari, Hector R, Bravo
openaire   +2 more sources