Welcome![Sign In][Sign Up]
Location:
Search - noise notch filter

Search list

[DocumentsA Nonlinear Adaptive Filter for Online Signal

Description: This paper presents various applications of a nonlinear adaptive notch filter which operates based on the concept of an enhanced phase-locked loop (PLL). Applications of the filter for online signal analysis for power systems protection, control and power quality enhancement are presented. The proposed scheme can be applied for signal analysis both under stationary and nonstationary conditions. Based on digital time-domain simulations, applications of the filter for a) sinusoidal waveform peak detection, b) harmonic identification/detection, c) detection/extraction of individual components of a signal, d) instantaneous reactive current extraction, e) disturbance detection, f) noise reduction in zero-crossings detection, and g) amplitude (phase) demodulation for flicker estimation, are presented.
Platform: | Size: 153503 | Author: yangyansky | Hits:

[matlabAdaptivenotchfilter

Description: 在自适应信号的理想输入为有正弦信号。噪声输入也为一正弦信号。它们相互迭加,再经过LMS自适应算法,再比较它们的结果。-In an ideal adaptive signal has sinusoidal input signal. Noise input for a sinusoidal signal. Their mutual superposition, and then after LMS adaptive algorithm, and then compare their results.
Platform: | Size: 2048 | Author: 闫丰 | Hits:

[Special EffectsLRG61

Description: 程序用来消除周期性噪声干扰信号。要求在图像频域中设计一Butterworth陷波器,其阶数n和陷波器半径D0由理论知识通过自己的探索得出,理解二者对滤波器性能的影响。-Procedures used to eliminate the periodic noise signal. Request images to design a Butterworth frequency domain notch filter, and its order n and the radius of notch filter D0 by the theoretical knowledge obtained through their own exploration, understanding both the impact on filter performance.
Platform: | Size: 1024 | Author: 赵少敏 | Hits:

[Othermain

Description: 传统的宽带信号中抑制正弦干扰的方法是采用陷波器(notch filter),为此我们需要精确知道干扰正弦的频率.然而当干扰正弦频率是缓慢变化时,且选频率特性要求十分尖锐时,则最好采用自适应噪声抵消的方法.用一个二阶FIR的LMS自适应滤波器消除正弦干扰的一个方案。 -Wideband signals in the traditional sinusoidal interference suppression method is to use a notch filter (notch filter), that we need to know precisely the frequency of sinusoidal interference. However, when the disturbance frequency is slow sinusoidal changes, and the frequency characteristics of the election request is very acute, is the best use of adaptive noise cancellation method. with a second-order FIR of the LMS adaptive filter to eliminate sinusoidal interference in a program.
Platform: | Size: 1024 | Author: wangming | Hits:

[matlabLMS_gai2

Description: 两个频率的凹口滤波对消干扰噪声,效果很好。希望大家仿真实验。-Two frequency notch filter to eliminate interference noise, the effect is very good. I hope everyone simulation experiments.
Platform: | Size: 1024 | Author: zhouguoxin | Hits:

[File FormatECE082

Description: Abstract— with the latest advancements in electronics, several techniques are used for removal of unwanted entities from signals especially that are implied in the most sophisticated applications. The removal of power line interference from most sensitive medical monitoring equipments can also be removed by implementing various useful techniques. The power line interference (50/60 Hz) is the main source of noise in most of bio-electric signals. The report presents the removal of power line interference, baseline wandering and additive white Gaussian noise (AWGN) from ECG signal using the different types of filtering technique. The project is based on digital signal processing (DSP) techniques with MATLAB package, the IIR Notch filter can be used for removal of power line interference, Median can be used for Baseline wandering noise and Discrete Wavelet Transform can be used for removal of AWGN.
Platform: | Size: 654336 | Author: muthupandy | Hits:

[OtherDSPII_USTC_01

Description: 传统的宽带信号中抑制正弦干扰的方法是采用陷波器(notch filter),为此需要精确知道干扰正弦的频率.然而当干扰正弦频率是缓慢变化时,且选频率特性要求十分尖锐时,则最好采用自适应噪声抵消的方法.下图是用一个二阶FIR的LMS自适应滤波器消除正弦干扰的一个方案。该代码实现了以下功能: 1) 借助MATLAB画出了滤波器的误差性能曲面和误差性能曲面的等值曲线; 2) 给出了最陡下降法以及LMS算法的计算公式; 3) 用MATLAB产生了方差为0.05, 均值为0白噪音S(n),并画出某次采样得到的波形; 4) 根据 2)中的公式,并利用 3)中产生的S(n),在 1)中的误差性能曲面的等值曲线上叠加画出了采用最陡下降法以及LMS法时H(n)的在叠代过程中的轨迹曲线; 5)用MATLAB计算并画出了LMS法时误差随时间n的变化曲线(对应S(n)的某一次的一次实现)和e(n)波形; 6)在 1)中的误差性能曲面的等值曲线上,叠加画出采用LMS法得到的100次实验中的H(n)的平均值的轨迹曲线; 7)最终对结果进行了分析,具体见压缩包的word文档。 -Wideband signal in the conventional sinusoidal interference suppression method is the use notch filter (notch filter), this requires precise knowledge of the frequency of a sinusoidal interference . However, when the interference frequency sinusoidal changes slowly , and the selected frequency characteristic requirements are very sharp , then best use of adaptive noise cancellation method . following figure is a second-order FIR LMS adaptive filter to eliminate a program sinusoidal interference . The code implements the following functions:   A ) draw with MATLAB error performance of the filter surface and the surface contour error performance curve 2 ) gives the steepest descent method and the LMS algorithm formula 3 ) generated using MATLAB variance of 0.05 with a mean of 0 white noise S (n), and draw a particular sampling waveform 4 ) based on 2 ) of the formula , and use 3 ) generated in S (n), in a ) the error performance curves superimposed on the surface contour pl
Platform: | Size: 313344 | Author: 邵曈 | Hits:

[Special Effectsfiltering_F

Description: 图像频域滤波,用matlab实现了在图像频域中通过Butterworth陷波器消除周期性噪声干扰信号。-Image frequency domain filtering using matlab achieved in the frequency domain image by Butterworth notch filter to eliminate periodic noise signal.
Platform: | Size: 194560 | Author: sxw | Hits:

[OtherYUYINXINH

Description: 第7章语音信号的减噪176 7.1自适应滤波器减噪176 7.1.1LMS算法基本原理176 7.1.2基本LMS自适应算法178 7.1.3LMS的自适应陷波器181 7.2谱减法减噪184 7.2.1基本谱减法184 7.2.2改进的谱减法187 7.3维纳滤波法减噪195 7.3.1维纳滤波的基本原理195 7.3.2维纳滤波减噪的具体步骤和函数WienerScalart96197 7.3.3维纳滤波的MATLAB例子1-Noise Chapter 7 of the speech signal noise reduction algorithm for adaptive filters 176 7.1 Fundamentals 7.1.2 Basic LMS adaptive algorithm 176 178 7.1.3LMS of 176 7.1.1LMS adaptive notch filter 181 7.2 184 7.2 spectral subtraction noise reduction 184 7.2.2 .1 basic spectral subtraction improved spectral subtraction method of noise reduction Wiener filter 187 195 7.3 Fundamentals 7.3.1 195 7.3.2 Wiener filtering Wiener filter noise of concrete steps and functions WienerScalart96197 7.3.3-dimensional MATLAB examples Carolina filter 199
Platform: | Size: 98304 | Author: 孟稳 | Hits:

[Program docDSP-transponder-signal-processing

Description: 利用TMS320VC5509A为核心的DSP处理硬件,通过软件实现自适应Notch滤波和瞬时频率序列方差检测(VIRD)运算,在较低信噪比使用条件下完成对单频测距信号的可靠检测和判定-Using tms320vc5509a DSP core processing hardware, adaptive notch filter and variance of instantaneous frequency sequence detection (Vird) operation is realized by software, in low signal to noise ratio under the conditions of use complete reliable detection of single frequency ranging signal and judging
Platform: | Size: 72704 | Author: CaoYu | Hits:

[matlabnotch

Description: notch filter is used to remove noise
Platform: | Size: 21504 | Author: jeya | Hits:

CodeBus www.codebus.net