Modal superposition in the time domain: Theory and experimental results

1995 ◽  
Vol 97 (1) ◽  
pp. 92-97 ◽  
Author(s):  
Marinus M. Boone ◽  
Gilles Janssen ◽  
Michiel van Overbeek
Keyword(s):  
Time Domain ◽  
Experimental Results ◽  
Domain Theory ◽  
Modal Superposition ◽  
The Time Domain

scholarly journals Harmonic Cancellation

2021 ◽  
Author(s):  
Alain de Cheveigné
Keyword(s):  
Auditory System ◽  
Time Domain ◽  
Experimental Results ◽  
Target Sound ◽  
Neural Representations ◽  
Behavioral Studies ◽  
System P ◽  
Harmonic Cancellation ◽  
The Time Domain

This paper reviews the hypothesis of {\em harmonic cancellation}\ according to which an interfering sound is suppressed or canceled on the basis of its harmonicity (or periodicity in the time domain). It defines the concept, discusses theoretical arguments in its favor, and reviews experimental results that support it, or not. If correct, the hypothesis likely draws on time domain processing of temporally-accurate neural representations within the brainstem, as required also by the classic Equalization-Cancellation (EC) model of binaural unmasking. It predicts that a target sound corrupted by interference will be easier to hear if the interference is harmonic than inharmonic, all else being equal. This prediction is borne out in a number of behavioral studies, but not all. The paper reviews those results, with the aim to understand the inconsistencies and come up with a reliable conclusion for, or against, the hypothesis of harmonic cancellation within the auditory system.

scholarly journals An Adaptive Spectral Kurtosis Method Based on Optimal Filter

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Yanli Yang ◽  
Ting Yu
Keyword(s):  
Fault Diagnosis ◽  
Frequency Domain ◽  
Time Domain ◽  
Experimental Results ◽  
Bearing Fault ◽  
Spectral Kurtosis ◽  
Bearing Fault Diagnosis ◽  
The Core ◽  
Factors Influencing ◽  
The Time Domain

As a useful tool to detect protrusion buried in signals, kurtosis has a wide application in engineering, for example, in bearing fault diagnosis. Spectral kurtosis (SK) can further indicate the presence of a series of transients and their locations in the frequency domain. The factors influencing kurtosis values are first analyzed, leading to the conclusion that amplitude, not the frequency of signals, and noise make major contribution to kurtosis values. It is helpful to detect impulsive components if the components with big amplitude are removed from composite signals. Based on this cognition, an adaptive SK algorithm is proposed in this paper. The core steps of the proposed SK algorithm are to find maxima, add window around maxima, merge windows in the frequency domain, and then filter signals according to the merged window in the time domain. The parameters of the proposed SK algorithm are varying adaptively with signals. Some experimental results are presented to demonstrate the effectiveness of the proposed algorithm.

Circuit Implementation of Multiscroll Chaotic Attractors Generated Using Step Function

2015 ◽  
Vol 25 (12) ◽  
pp. 1550160
Author(s):  
Yingjie Ma ◽  
Hua Jiang ◽  
Lei Ju
Keyword(s):  
Time Domain ◽  
Nonlinear Function ◽  
Step Function ◽  
Experimental Results ◽  
Chaotic Attractors ◽  
Circuit Implementation ◽  
New Chaotic System ◽  
The Time Domain ◽  
Hardware Circuit ◽  
The Physical Realization

A new chaotic system is proposed to generate multiscroll chaotic attractors. The major method used is for the step function to act as a nonlinear function. To prove that the proposed system can generate multiscroll chaotic attractors, the equilibrium point, the time domain waveform and the phase diagram of the proposed system are calculated. Finally, the design of the hardware circuit produces experimental results at a maximum of 8-scroll hardware. Theoretical analysis, simulation and hardware experimental results are fully matched, which further proves the existence of the proposed system and the physical realization. This provides the possibility for future applications in engineering.

scholarly journals Casimir forces in the time domain: Theory

2009 ◽  
Vol 80 (1) ◽  
Author(s):  
Alejandro W. Rodriguez ◽  
Alexander P. McCauley ◽  
John D. Joannopoulos ◽  
Steven G. Johnson
Keyword(s):  
Time Domain ◽  
Domain Theory ◽  
Casimir Forces ◽  
The Time Domain

TRANSITIONS BETWEEN WANNIER–STARK STATES OF SEMICONDUCTOR SUPERLATTICES UNDER ELECTROSTATIC FIELD

2008 ◽  
Vol 22 (08) ◽  
pp. 1005-1013
Author(s):  
WEI HAN ◽  
DADONG YAN ◽  
ZHANGJIAN CHEN
Keyword(s):  
Numerical Calculation ◽  
Electric Fields ◽  
Electrostatic Field ◽  
Time Domain ◽  
Energy Levels ◽  
Experimental Results ◽  
Semiconductor Superlattice ◽  
Spatial Oscillations ◽  
The Time Domain ◽  
Static Electric Fields

We investigate the transitions between two minibands in a semiconductor superlattice under the influence of high static electric fields. Our numerical calculation, which is based on the two energy levels system, shows that this interminiband transition will lead to anticrossings that can be determined by the coupled Hamiltonian. In the time domain, spatial oscillations come forth between the main locations of the particle in the two transition states. At the anticrossings, the amplitudes are the maximum which agree with the experimental results.

Impulse response determination in the time domain-Theory

1982 ◽  
Vol 30 (4) ◽  
pp. 657-663 ◽  
Author(s):  
T. Sarkar ◽  
D. Weiner ◽  
V. Jain ◽  
S. Dianat
Keyword(s):  
Impulse Response ◽  
Time Domain ◽  
Domain Theory ◽  
The Time Domain ◽  
Response Determination

scholarly journals Generation of flat-top waveform in the time domain based on stimulated Brillouin scattering using medium with short phonon lifetime

2008 ◽  
Vol 26 (4) ◽  
pp. 511-516 ◽  
Author(s):  
W.L.J. Hasi ◽  
S. Gong ◽  
Z.W. Lu ◽  
D.Y. Lin ◽  
W.M. He ◽  
...  
Keyword(s):  
Time Domain ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Experimental Results ◽  
Transmitted Pulse ◽  
Phonon Lifetime ◽  
The Time Domain ◽  
Stimulated Brillouin

AbstractA method of generating flat-top waveform in the time-domain based on stimulated Brillouin scattering (SBS) using medium with short phonon lifetime is proposed. In theory, the transmitted pulse is simulated in the case of several media with different phonon lifetime. In experiment, FC-72 and HT-270, which differ significantly in the phonon lifetime, are exploited in the experiment. Both the theoretical and experimental results indicate that, when choosing medium with short phonon lifetime, the top is almost a platform, while there is a peak in the front and a platform thereafter when choosing medium with long phonon lifetime.

Fault Diagnosis of Hydraulic Syetem Based on Neural Network

2011 ◽  
Vol 48-49 ◽  
pp. 515-518
Author(s):  
Hong Bin Tang ◽  
Yun Xin Wu
Keyword(s):  
Neural Network ◽  
Fault Diagnosis ◽  
Parallel Processing ◽  
Associative Memory ◽  
Time Domain ◽  
Hydraulic System ◽  
Experimental Results ◽  
The Time Domain ◽  
Self Learning ◽  
Self Organizing

Because neural network has the advantages of fast parallel processing, associative memory, self-organizing and self-learning, it is widely applied in the fault diagnosis of hydraulic system. Present in this paper is a fault diagnosis approch to a typical failure in hydraulic system which is leakage of hydraulic cylinder.The fault diagnosis approch is based on monitoring preesure singal,time domain feature and neural network. According to the method, the time domain feature is extracted from the pressure singal and costitutes the eigenvectors at first, then these eigenvectors are input into neural network to identify faults. The experimental results show that three modes of no leakage, slighter leakage and severe leakage are correctly identified and it can be used in the fault diagnosia of hydraulic syetem.

Apodisation in the time domain

1992 ◽  
Vol 2 (4) ◽  
pp. 615-620
Author(s):  
G. W. Series
Keyword(s):  
Time Domain ◽  
The Time Domain
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