Description: FIR数字滤波器的设计方法主要是建立在对理想滤波器频率特性作某种近似的基础上的。这些近似方法有窗函数法、频率抽样法、最佳一致逼近法。在这里只讨论窗函数法。程序中也是采用了这种方法。-FIR digital filter design method is mainly based on the frequency characteristics of the ideal filter for some kind of approximation on the basis of. These approximate methods are a window function method, frequency sampling method, the best uniform approximation method. Here only to discuss the window function method. Procedure is also adopted this approach. Platform: |
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Author:李文 |
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Description: 包含FIR IIR窗函数法，频率采样法，模拟滤波器等 -FIR IIR contains window function method, frequency sampling method, such as analog filters Platform: |
Size: 35840 |
Author:马纪 |
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Description: 数字滤波器的设计及性能比较
用三种方法设计FIR滤波器：窗口法、最大最小误差法、频率采样法；用两种方法设计IIR滤波器：冲激响应不变法、双线性变换法。很全的matlab滤波器程序！- Digital filter design and performance comparison of three methods to use FIR filter design: the window method, the largest minimum error method, frequency sampling method two ways IIR filter design: impulse response of the same law, two and transform. Is the whole process of the matlab filter! Platform: |
Size: 1024 |
Author:洪耀辉 |
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Description: FIR数字滤波器的设计:用窗函数法，频率采样法及优化设计法设计FIR滤波器的原理及方法,用MATLAB编程实现FIR数字滤波器的设计-FIR digital filter design: using window function method, frequency sampling method and optimal design of FIR filter design method principles and methods, using MATLAB programming design of FIR digital filters Platform: |
Size: 148480 |
Author:田华梅 |
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Description: 用汉宁窗函数法设计一个数字FIR高通滤波器，要求通带边界频率为500Hz，阻带边界频率为400Hz，通带最大衰减1dB，阻带最小衰减40dB，抽样频率为2000Hz，用MATLAB画出幅频特性，画出并分析滤波器传输函数的零极点-With han ning window function method to design a digital FIR high-pass filter, request bandpass boundary frequency for 500 Hz, stop-band boundary frequency for 400 Hz, bandpass biggest 1 dB attenuation, stop-band attenuation least 40 dB, sampling frequency for 2000 Hz, MATLAB draw the amplitude frequency characteristics, painted and analysis filter transmission function of zero poles Platform: |
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Author:韩延罡 |
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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: |
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Author:邵曈 |
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Description:
使用matlab进行IIR与FIR数字滤波器的设计。使用直接法和双线性变换法设计IIR数字滤波器，利用窗函数法，频率采用法设计FIR数字滤波器并进行GUI界面的设计。
-Using matlab to design IIR and FIR digital filter. Using the direct method and the bilinear transform to design IIR digital filter and using window function method, frequency sampling method to design FIR digital filter .Finally a GUI interface is designed to show the process . Platform: |
Size: 110592 |
Author:李婉灵 |
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Description: （1）录制一段语音信号，完成对信号的采样，画出信号的时域波形和频谱图，确定信号的频谱范围；
（2）给信号叠加噪声（噪声类型分为如下几种：a白噪声；b单频噪色（正弦干扰）；c多频噪声（多正弦干扰）；d其它干扰。），画出受噪声干扰的信号时域波形和频谱图；
（3）采用窗函数法设计FIR低通滤波器，画出滤波器的频响特性图；
（4）用所设计的滤波器对受噪声影响的信号进行滤波，画出滤波后语音信号的时域波形图和频谱图；
（5）对滤波前后的信号进行对比，分析信号的变化；回放语音信号，并与原始语音信号对比。((1) record a speech signal, complete the sampling of the signal, draw the time domain waveform and frequency spectrum of the signal, and determine the spectrum range of the signal;
(2) signal superposition noise (noise type is divided into the following: a white noise, B single frequency noise (sinusoidal interference); C multifrequency noise (multi sinusoidal interference); d other interference) Noise signal, time domain waveform and spectrogram are drawn;
(3) the FIR low-pass filter is designed by using the window function method, and the frequency response characteristic of the filter is drawn;
(4) the designed filter is used to filter the signal affected by the noise, and the time domain waveform and spectrogram of the filtered speech signal are drawn;
(5) compare the signals before and after filtering, analyze the change of the signal, replay the speech signal, and compare with the original speech signal) Platform: |
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Author:华
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Description: 简单的数字滤波器设计
1．用脉冲响应不变法设计巴特沃斯数字滤波器
2. 用双线性变换法设计切比雪夫数字滤波器
3. 用双线性变换法设计巴特沃斯数字滤波器，并将直接型结构转换成级联型结构
5.设计带阻滤波器
6．利用窗函数设计法设计FIR数字低通滤波器
7. 利用频率采样设计法设计FIR数字低通滤波器。
8. 创新训练拓展内容
（1）根据心电信号特点设计IIR或FIR滤波器滤除心电图信号噪声
（2）设计IIR滤波器或FIR滤波器对语音信号进行滤波。(Simple digital filter design
1. design of Butterworth digital filter by impulse response invariance
2. design of Chebyshev digital filter by bilinear transform
3. the Butterworth digital filter is designed by the bilinear transformation method, and the direct structure is converted into a cascade structure
5. design bandstop filter
6. design of FIR digital low pass filter by window function design
7. the FIR digital low pass filter is designed by using the frequency sampling design method.
8. the content of creative training and expansion
(1) design IIR or FIR filter to filter the noise of electrocardiogram signal according to the characteristics of ECG signal
(2) the IIR filter or FIR filter is designed to filter the speech signal.) Platform: |
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Author:jl12
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