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During the course of noise reduction, wavelet threshold filtering algorithm can inhibite noise effectively, however Donoho threshold function hasn't self-adaption between dimensions and results in signal details' losing. Based on output signal of the thin-film thickness wideband monitoring system, it is processed by the improved Donoho threshold function whose threshold is added by micro-alignment...
It is necessary to enhance the anti-jamming capability of Synthetic Aperture Radar (SAR) for ensuring its imaging performance. A new approach to suppress wide band noise interference (WBNI) based on dechirping and eigensubspace filtering was proposed in this essay, and computer simulations were performed. All results prove that this approach can effectively suppress WBNI with negligible signal distortion...
The main research of this dissertation focuses on the noise correlation template, and bases on the research of the basic transmitted reference (TR) receiver and the average transmitted reference (ATR) receiver, a new transmitted reference receiver is proposed by replacing the repetitive reference pulses with multiple short pseudo-random reference pulse sequences (PNTR) with the principle research...
Automatic recognition of emotional states via speech signal has attracted increasing attention in recent years. A number of techniques have been proposed which are capable of providing reasonably high accuracy for controlled studio settings. However, their performance is considerably degraded when the speech signal is contaminated by noise. In this paper, we present a framework with adaptive noise...
In this paper, a new method is proposed to test the conducted electromagnetic interference (EMI) noise of new energy based on analysis the internal structure and measuring principle of line impedance stabilization network. A more accurate measurement of conducted EMI noise in new energy system can be provided by this method in order to design the appropriate filter for conducted EMI noise suppression...
For removing salt and pepper noise from corrupted images we are using so many algorithms. In this paper, a robust statistical based median filter is introduced to remove salt and pepper noise. The function of the algorithm is to detect the corrupted pixel first since the impulse noise only affect certain pixels in the image and the remaining pixels are uncorrupted. The corrupted pixels are replaced...
This work is concerned with developing the time-delay-based jamming technology against SAR. Traditional time-delay echo jamming can only get a point or a line false imaging when through the SAR system, which can't protect distributed targets. This paper presents a modified time-delay echo jamming style, Time-delay Inter-pulse Jitter Echo jamming (TDIJEJ). The theoretic analysis and simulation show...
A novel adaptive interference canceller(AIC) based on empirical mode decomposition(EMD) is presented in this paper. Specifically, the method is applied to the electromagnetic radiation measurement with nonstationary ambient electromagnetic interference(EMI). At first, the electromagnetic radiation signal with EMI noise is decomposed to different intrinsic mode functions which represent signals with...
This study describes a novel method, called single-linking pulse coupled neural network (PCNN), for Altering extreme impulse noise in a image. The proposed single-linking PCNN simplifies conventional PCNN and thus the related parameter can be adaptively selected and no iteration time needs to be determined, which a noisy image can be filtered by two times of firing process of the original image and...
In this paper, we propose the meshed-planar electromagnetic bandgap (MP-EBG) structure with a meshed planar surface embedded in the package power plane to suppress a power/ground noise in the frequency range from 3.1 GHz to 10.6 GHz, also known as the frequency band of Ultra-Wideband (UWB). The MP-EBG structure has two different EBG surfaces. One surface is a mushroom-like surface embedded between...
Near-field measurements are sometimes corrupted by ambient noise from either far- or near-field sources. Far-field noise can be removed by performing measurements in a shielded room, but this option is not always available. An adaptive noise cancellation technique is proposed for cancelling ambient electromagnetic interference from measurements taken in a noisy environment. A time-domain, non-recursive,...
A miniaturized common-mode suppression filter for GHz differential signals is realized using LTCC fabrication technology. The filter is realized in SMD-typed package with the physical size of 1.6 mm × 1.6 mm. Its equivalent circuit model is established to illustrate the properties of the common mode suppression and the differential mode propagation. It is found in measurement that the common-mode...
In this paper, the design of a new-style instrumentation amplifier based on chopper-stabilized technology is reported. It consists of a low power operational amplifier with TCMC structure, modulating and demodulating circuits with two switches and low-pass filter module which could reduce flicker noise of instrumentation amplifier effectively. By analysis and optimization of the parasitic effects...
This paper proposes novel adaptive Volterra recursive least square (RLS) algorithms, which dynamically choose Volterra channels for coefficient updates in order to reduce computational complexity while still maintaining the compromised performance degradation for nonlinear active noise control. The developed algorithms employ a channel selection scheme, which compares an adaptive threshold to the...
In order to improve the self-recovery capabilities of the IEEE 1451 based intelligent sensors and enhance the level of sensors' intelligence, this paper presents a sensors fault detection and repair method based on Auto-Associative Neural Network (AANN). The error sum of squares (SSE) is introduced as a sensor fault evaluation factor on the basis of the inherent non-linearity & non-orthogonal...
The paper presents the noise situation model for mobile radio communication systems, which is a basis for synthesis of signal reception adaptive algorithm with complex noise suppression. Digital filtering is used for noise suppression. The digital filter simulation results are given.
In this work, we consider the amplify-and-forward (AF) two-way relay network where the two terminals TA, TB exchange their information through a relay node TR in a bi-directional manner and study the impact of the training-based channel estimation upon individual and sum-rate of the two users. We assume that in the multiple-access (MA) phase TA, TB initiate transmission by sending their training symbols...
In IGBT PWM inverter-induction motor system, the high dv/dt and di/dt due to the fast swishing of IGBT could bring serious EMI issues and common-mode voltage is a major source of adverse effects. This paper presents a technique for modeling and analysis of the conducted EMI noise. The noise model is investigated to get a full understanding of the EMI mechanism. The analysis and results proposed here...
An efficient digital notch filter for 50Hz noise eliminated from low frequency photoacoustic gas sensing signal is presented in this paper by a Matlab program. The digital notch filter is consisted of the fast Fourier transform, a second order infinite impulse response notch filter, inverse fast Fourier transform, real and imaginary parts separating, phase shift for imaginary part, and pure noise...
In this work, a complete single-ended readout circuit for capacitive MEMS gyroscope using chopper stabilization technique is presented. A novel noise cancellation technique is used to get rid of the bias noise. The circuit offers superior performance over state of the art readout circuits in terms of cost, gain, and noise for the given area and power consumption. The full circuit exhibits a gain of...
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