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电话计费器程序/*信号定义:
clk: 时钟信号,本例中其频率值为1Hz;
decide: 电话局反馈回来的信号,代表话务种类,“01”表示市话,“10”表示
长话,“11”表示特话;
dispmoney: 用来显示卡内余额,其单位为角,这里假定能显示的最大数额为50 元
(500 角);
disptime: 显示本次通话的时长;
write,read: 当write 信号下降沿到来时写卡,当话卡插入,read 信号变高时读卡;
warn: 余额过少时的告警信号。
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图像锐化,包含拉普拉斯锐化法 4邻域模板
巴特沃斯高通滤波器锐化, 阶数M=3 截断频率D0=40,梯度算子锐化 sobel和prewi-Image sharpening, including Laplacian sharpening four neighborhood template Butterworth high-pass filter sharpening, the order M = 3 cut off frequency D0 = 40, sharpening sobel gr
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matlab下实现降噪,功率谱计算。%程序中设定采样点数为256个,采样频率为10000hz,
%输入信号为随机噪声和两个正弦的合成信号
%设定的滤波器的截止频率为3500hz
%通过挈比雪肤滤波器,运行程序,比较滤波前后的频域波形
%滤波去除了高频信号-matlab achieve noise reduction, power spectrum calculation. Sampling procedure set for 256 points, the sampling f
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用于频域滤波的m函数,接受输入一幅图像和一个滤波函数,输出经滤波和剪切后的图像。还有一个高通滤波函数。-For frequency domain filtering m function, to accept the importation of an image and a filter function, the output cut by the filtering and image. There is also a high-pass filtering function.
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问题是高切滤波或低通滤波,如果采用硬件实现,速度最快,但是现在计算机速度这么快,硬件实现起来相对麻烦,成本高,且灵活性性差,
软件实现相对方便多了,具体体的操作步骤如下(频率域)
先对数据作正FFT,再对变换后的频域数据乘以滤波因子,滤波因子的选择有理想高通、巴特沃斯高通、指数高通、梯形高通,一般选择梯形高通滤波因子,具体原因你可从数字信号处理的书上找到,,接下来将数据再作逆FFT就是了,还有就是在空间域作滤波,这里有一个带同滤波的程序的程序,你可参考一下,(将低切参数设为零就是
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Implementation of a speech codec based on coding of speech at 8 kbit/s
using conjugate-structure algebraic-code-excited linear-prediction (CS-ACELP)
- We took .wav files that is sampled at 8000 Hz using 16-bit linear PCM. The encoding process i
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用窗函数法设计FIR带通滤波器。指标:低端通带截止频率wlp=0.35π 低端阻带截止频率wls=0.2π。高端通带截止频率whp=0.65π 高端阻带截止频率whs=0.8π。-Design of FIR with window function bandpass filter target: low-pass with cutoff frequency wlp = 0.35π low stopband cutoff frequency wls = 0.2π passband cutof
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1. 利用傅立叶级数展开的方法,自由生成所需的x(t);
2. 通过选择不同的采样间隔T(分别选T>或<1/2fc),从x(t)获得相应的x(n)(作出x(n)图形);
3. 对获得的不同x(n)分别作傅立叶变换,分析其频率响应特性(给出幅频与相频特性曲线);
4. 利用巴特沃思、切比雪夫或椭圆滤波器设计数字滤波器(滤波特性自定),要求通过改变滤波器参数或特性(低通、高通、带通或带阻)设计至少两种数字滤波器,分析所设计滤波器(画出频率特性曲线),并对上述给出的不同x(n)
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利用截止频率不同的频域高通滤波器对图像进行处理,并比较不同截止频率对滤波效果的影响,说明产生差异的原因。-Cut-off frequency of the different frequency-domain high-pass filter to the image processing, and compare the different cut-off frequency of the filtering effect, explain the causes of differences.
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A low-pass filter is a filter that passes low-frequency signals but attenuates (reduces the amplitude of) signals with frequencies higher than the cutoff frequency. The actual amount of attenuation for each frequency varies from filter to filter. It
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下载并读入被噪音污染的Noisychurch图像数据,用Matlab 编程采用下述方法分
别实现该图像的增强操作:
1) 用空域法实现图像的增强,分别采用如下模板操作:2x2 和3x3 的幅值为1
的模板,比较去噪和模糊的折中效果;采用3x3 的中值滤波器进行去噪操作;
采用Laplacian 模板[0 -1 0 -1 5 -1 0 -1 0]进行锐化操作。
2) 用频域法实现该图像的低通和高通滤波,选择合适的截止频率。
3) 用小波分析法实现该图像的低通和
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有限冲击响应模拟滤波器,可自行设计滤波器类型,拓扑结构、高、低截止频率
增益、窗函数等等,滤波效果好。-Limited impact response analog filter, can to design filter types, topology structure, high and low cut-off frequency Gain, window function and so on, filtering effect is good.
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对原图分别在频域内使用理想低通滤波器(选择任意截止频率)和理想高通滤波器(选择任意截止频率)和理想高通滤波器,再对其使用快速傅里叶变换,并输出修复后的图像的频率谱图。最后将高通滤波与低通滤波后的相加,输出,并与原图进行比较。-Respectively of the original image in the frequency domain using the ideal low-pass filter (choose an arbitrary cut-off frequency) and th
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采用双线性变换法设计一巴特沃斯高通滤波器,其通带截止频率(-3dB点处) =3KHz,阻带上限截止频率 =2KHz,能带衰减不大于3dB,阻带衰减不小于14dB,采样频率 =10KHz。-Bilinear transform design a Butterworth high-pass filter, the passband cut-off frequency (-3dB point) = 3KHz stopband upper cut-off frequency = 2KHz band a
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一段FPGA的分频代码,可以完成FPGA中高频分成低频的功能-a section of code about division of frequency which can cut high frequency to low frequency
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3nd order high pass filter with cut off frequency at 180Hz.
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2nd order high pass filter with cut off frequency at 400 Hz. Designed with cheby2 function in MATLAB.
-2nd order high pass filter with cut off frequency at 400 Hz. Designed with cheby2 function in MATLAB.
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2nd order high pass filter with cut off frequency at 31 Hz. Designed with cheby2 function in MATLAB.
-2nd order high pass filter with cut off frequency at 31 Hz. Designed with cheby2 function in MATLAB.
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公共端:共阳
脉冲:最大2MHz 对于57电机来说 最大频率为1K
方向:高低信号
脱机:输入低电平时电机电源被切断。也就是说的使能,高有效
步距角:1.8度-Common: common anode pulse: maximum 2MHz to 57 motors for maximum frequency of 1K direction: high and low signal off: When entering low motor power is cut off. Th
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仿真巴特沃思、切比雪夫模拟低通滤波器的设计方法;利用模拟域频率变换设计模拟高通、带通、带阻滤波器的方法。-Simulation Butterworth, cut analog design method Chebyshev low-pass filter using an analog frequency domain converting analog design high pass, band pass, band stop filter method.
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