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先由原始图像（任选）产生待恢复的图像； 利用二维小波分析对一幅图象作2层小波分解,并在此基础上提取各层的低频信息实现图像的压缩。
分别用逆滤波和维纳滤波恢复上面图像。
-First be the original image (optional) to restore the image to be generated the use of two-dimensional wavelet analysis of an image for two-layer wavelet decom
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用各种窗函数设计FIR数字滤波器。
分别用矩形窗和Hamming窗设计线性相位FIR低通滤波器。要求通带截止频率，单位脉冲响应h(n)的长度N=21，绘出h(n)及其幅频响应特性曲线。
-Window function with a variety of FIR digital filter design. Were rectangular window and Hamming window design of linear phase FIR low-pass filter. Req
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数字图像处理，频域滤波：理想低通滤波器、梯形滤波器、巴斯沃特滤波器-Digital image processing, frequency domain filtering: an ideal low-pass filter, ladder filters, Bath Water Filter
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频域低通滤波（理想低通滤波器、梯形低通滤波器、巴特沃斯低通滤波器、指数低通滤波器），频域高通滤波（理想高通滤波器、梯形高通滤波器、巴特沃斯高通滤波器、指数高通滤波器）-Frequency-domain low-pass filter (ideal low-pass filter, ladder low-pass filter, Butterworth low-pass filter, the index low-pass filter), frequency-domain high-pass f
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％ y=filter(sig,fmin,fmax)
％ 对信号进行理想滤波，可完成低通，带通
％ sig为被滤波信号
％ fmin为下限频率，当fmin为0时为低通滤波器，当fmin>0时，为带通滤波器
％ fmax为上限频率，fmax>fmin
％ fs为信号的采样频率
％ y为经过滤波后的信号
-％ Y = filter (sig, fmin, fmax)％ of the ideal signal filtering, to be com
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设计一个低通滤波系统，任意输入三个频率使输入的信号中留下频率最低的
一个分量。-Designed a low-pass filter system, indiscriminate importation of the three input signal frequency so that left one of the lowest frequency component.
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ex5_1 I-型线性相位FIR滤波器
ex5_2 II-型线性相位FIR滤波器
ex5_3 III-型线性相位FIR滤波器
ex5_4 IV-型线性相位FIR滤波器
ex5_5 矩形窗频响
ex5_6 希尔伯特变换器设计－汉宁窗
ex5_7 低通滤波器设计－汉明窗
ex5_8 带通滤波器设计－布莱克曼窗
ex5_9 低通滤波器设计－凯塞窗
ex5_11 频率采样技术：低通，朴素法
ex5_12 频率采样技术：低通, 最优法T1 & T2
ex5_13
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1）设计Butterworth型音频抗混叠滤波器；
2）参数：
下通带频率300Hz；上通带频率3400Hz；
下阻带频率280Hz；上阻带频率3600Hz；
通带最大衰减0.3dB；
阻带最小衰减40dB；
3）采用一低通滤波器和一高通滤波器级联；
4）分别确定LPF和HPF的性能指标；
5）求出两滤波器的系统函数和频率响应，并画出其幅频特性曲线；
6）求整个滤波器的系统函数和频率响应，并画出其幅频特性曲线。-1) the design of Butterw
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Useing the MATLAB command remez to obtain a low pass filter z(n) with a cutof frequency
of 40 Hz at a sample rate of 1000 Hz.
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We have to design a second order Butterworth filter having a sampling frequency of 20 kHz and -3db cut of frequency at 2 kHz in visual C. Only low frequency signals can pass through this filter and the signals having the frequency higher than frequen
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设计产生一个连续信号，包含低频，中频，高频分量，对其进行采样，进行频谱分析，使用矩形窗设计不同特性的数字滤波器对信号进行滤波处理，分析所设计滤波器(画出了频率特性曲线)，并对信号进行滤波，画出滤波后信号的时域波形和频谱，并对滤波前后的信号进行对比，同时设计出了一个友好的人机交互界面。-Designed to produce a continuous signal, including low frequency, medium frequency, high frequency componen
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绘制四种常用低通模拟滤波器（贝赛尔滤波器，巴特沃斯滤波器，切比雪夫滤波器及椭圆滤波器）幅频特性曲线-Draw four commonly used low-pass analog filter (Bessel filter, Butterworth filter, Chebyshev filter and elliptic filter) amplitude-frequency characteristic curve
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Filter type: Low Pass
Filter model: Butterworth
Filter order: 2
Sampling Frequency: 1000 Hz
Cut Frequency: 100.000000 Hz
Coefficents Quantization: 8-bit
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对高斯噪声进行低通滤波，对比前后结果，观察滤波器的平滑作用-Gaussion noise low frequency filter
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1阶巴特沃兹低通滤波器
将原定义在图像空间的图像转换的频域空间，利用频域空间的特有性质进行加工，最后再转换到图像空间-An order Butterworth low-pass filter the original definition of the image of the image space into the frequency domain, frequency domain-specific nature of processing, and finally converted
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用频率采样法设计FIR低通滤波器，本科生毕业设计用-Undergraduate graduation design with low-pass filter design FIR frequency sampling method,
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本实验要求使用PIC16F877A的CCP1模块的PWM功能和一个一阶RC低通滤波器产生一个5Hz的正弦信号。要求用示波器观察产生正弦信号的频率为准确的5Hz,且没有明显的失真。没有条件的读者可以通过观测直接和CCP1输出引脚相连的LED的闪烁频率来确定产生正弦信号的频率。-PWM function of the requirements of the experimental use PIC16F877A CCP1 module and a first-order RC low-pass fi
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本程序主要能实现对图像进行低通滤波，保护图像的低频信息，滤除高频信息，为图像边缘检测提供良好的环境-This procedure can realize the image is low pass filtered, low-frequency information of the protected image, to filter out high frequency information, provide a good environment for the image edge det
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设计一个Chebyshev II型低通滤波器，指标如下：
通带边界频率：，通带最大衰减：。
阻带截止频率：，阻带最小衰减：。-Design a II Chebyshev type low pass filter, the index is as follows:
Pass band boundary frequency: 0.2pi, pass band attenuation: 1db.
Stop band cutoff frequency: 0.4pi, minimum at
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Bandpass Filters
A band pass filter is an electronic circuit that allows the passage of a
Frequency range of a signal and attenuates the remaining frequencies.
We present three bandpass filters that added deliver the audible spectrum
By the human
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