Chaotic dissipative solitons induced by an external noise signal in a self-oscillating ring with a ferromagnetic film

2010 ◽  
Author(s):  
S. V. Grishin ◽  
E. V. Zar'kova ◽  
Yu. P. Sharaevskiy
Keyword(s):  
Ferromagnetic Film ◽  
External Noise ◽  
Noise Signal ◽  
Dissipative Solitons

Phase Selective Oscillations in Two Noise Driven Synaptically Coupled Spiking Neurons

2015 ◽  
Vol 25 (07) ◽  
pp. 1540005
Author(s):  
Ilya Prokin ◽  
Ivan Tyukin ◽  
Victor Kazantsev
Keyword(s):  
Numerical Simulations ◽  
Coupled System ◽  
External Noise ◽  
Noise Signal ◽  
Feedback Mechanism ◽  
Spike Timing ◽  
Spiking Neurons ◽  
Time Lags ◽  
Tuning Parameters ◽  
Synaptic Inputs

The work investigates the influence of spike-timing dependent plasticity (STDP) mechanisms on the dynamics of two synaptically coupled neurons driven by additive external noise. In this setting, the noise signal models synaptic inputs that the pair receives from other neurons in a larger network. We show that in the absence of STDP feedbacks the pair of neurons exhibit oscillations and intermittent synchronization. When the synapse connecting the neurons is supplied with a phase selective feedback mechanism simulating STDP, induced dynamics of spikes in the coupled system resembles a phase locked mode with time lags between spikes oscillating about a specific value. This value, as we show by extensive numerical simulations, can be set arbitrary within a broad interval by tuning parameters of the STDP feedback.

scholarly journals Calibration of a three-band microwave radiometric system by an external noise signal source

2021 ◽  
Vol 1991 (1) ◽  
pp. 012027
Author(s):  
E V Fedoseeva ◽  
I N Rostokin ◽  
E A Rostokina ◽  
G G Shchukin
Keyword(s):  
External Noise ◽  
Noise Signal ◽  
Signal Source ◽  
Radiometric System

Generation of single chaotic microwave pulses in a self-oscillating ring system with ferromagnetic film under the action of external noise

2013 ◽  
Vol 39 (4) ◽  
pp. 321-324
Author(s):  
S. V. Grishin ◽  
S. A. Nikitov ◽  
D. V. Romanenko ◽  
V. O. Khudolozhkin ◽  
Yu. P. Sharaevskii
Keyword(s):  
Ferromagnetic Film ◽  
External Noise ◽  
Ring System ◽  
Microwave Pulses ◽  
Chaotic Microwave

BIFURCATIONS AND CHAOTIC OSCILLATIONS IN AN AUTOMATIC CONTROL RELAY SYSTEM WITH HYSTERESIS

2001 ◽  
Vol 11 (05) ◽  
pp. 1193-1231 ◽  
Author(s):  
ZHANYBAI T. ZHUSUBALIYEV ◽  
EVGENIY A. SOUKHOTERIN ◽  
VADIM N. RUDAKOV ◽  
YURI V. KOLOKOLOV ◽  
ERIK MOSEKILDE
Keyword(s):  
External Noise ◽  
Noise Signal ◽  
Power Supplies ◽  
Unstable Periodic Orbits ◽  
Chaotic Oscillations ◽  
Relay System ◽  
Control Relay ◽  
Radio Electronics ◽  
Electron Microscopes ◽  
High Or Low Temperature

The dynamics of relay system with hysteresis is investigated. Systems of this type have a broad range of applications for power control and temperature regulation or in order to obtain highly stabilized electric or magnetic fields. Examples are power supplies for radio-electronics, computer equipment or spacecrafts, test stands for investigations of high- or low-temperature superconductivity, electron microscopes, and nuclear magnetic resonance tomographs. We first describe a general approach to determine stable and unstable periodic orbits for systems with hysteresis. Considering a concrete example of a four-dimensional relay system with hysteresis we hereafter determine the regions of periodic and chaotic oscillations in parameter space. The regularities in the occurrence of periodic motions are studied, and the associated bifurcations are described. The causes of nondeterminate (i.e. chaotic) dynamics are discussed and the influence of an external noise signal is analyzed.

Wide band fiber systems and long transmission applications based on optimum optical fiber amplifiers lengths

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahmoud M. A. Eid ◽  
Vishal Sorathiya ◽  
Sunil Lavadiya ◽  
Huda Said Abd El-Hamid ◽  
Ahmed Nabih Zaki Rashed
Keyword(s):  
Power Level ◽  
Wide Band ◽  
Signal Amplitude ◽  
Fiber Amplifier ◽  
Noise Signal ◽  
Fiber Amplifiers ◽  
Fiber System ◽  
Optical Fiber Amplifiers ◽  
Amplitude Level ◽  
Program Version

Abstract Article clarified the optimum fiber amplifiers length for wide band fiber system applications. Optical suppressed carrier transceiver with various fiber amplifier lengths in long haul applications is simulated by using optisystem simulation program version 13. Max. Q coefficient and min. BER can be tested for various fiber amplifiers lengths from 5 to 30 m. The optimum performance efficiency is achieved with 5 m amplifier length which the max. Q coefficient is 62.5 and bits error rate is tended to zero. Peak power amplitude level, noise signal power level, noise signal amplitude level (NSAL) and peak signal amplitude level after channel with a 45 km length for optimum fiber optic amplifier length of 5 m are measured.

scholarly journals Modified GSC Method to Reduce the Distortion of the Enhanced Speech Signal Using Cross-Correlation and Sidelobe Neutralization

2021 ◽  
Vol 11 (14) ◽  
pp. 6288
Author(s):  
Hang Su ◽  
Chang-Myung Lee
Keyword(s):  
Speech Signal ◽  
Output Signal ◽  
Cross Correlation ◽  
Acoustic Noise ◽  
Audio Signal ◽  
Noise Signal ◽  
Lms Algorithm ◽  
Least Mean Square ◽  
Experiment Data ◽  
Noise Component

The generalized sidelobe canceller (GSC) method is a common algorithm to enhance audio signals using a microphone array. Distortion of the enhanced audio signal consists of two parts: the residual acoustic noise and the distortion of the desired audio signal, which means that the desired audio signal is damaged. This paper proposes a modified GSC method to reduce both kinds of distortion when the desired audio signal is a non-stationary speech signal. First, the cross-correlation coefficient between the canceling signal and the error signal of the least mean square (LMS) algorithm was added to the adaptive process of the GSC method to reduce the distortion of the enhanced signal while the energy of the desired signal frame was increased suddenly. The sidelobe pattern of beamforming was then presented to estimate the noise signal in the beamforming output signal of the GSC method. The noise component of the beamforming output signal was decreased by subtracting the estimated noise signal to improve the denoising performance of the GSC method. Finally, the GSC-SN-MCC method was proposed by merging the above two methods. The experiment was performed in an anechoic chamber to validate the proposed method in various SNR conditions. Furthermore, the simulated calculation with inaccurate noise directions was conducted based on the experiment data to inspect the robustness of the proposed method to the error of the estimated noise direction. The experiment data and calculation results indicated that the proposed method could reduce the distortion effectively under various SNR conditions and would not cause more distortion if the estimated noise direction is far from the actual noise direction.

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