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Description: DFT进行频谱分析时的三种现象
1、混叠：对连续信号采样，要求连续信号是带限的，采样频率要足够高。Fs应满足Nyquist采样定理才不产生混叠。
采样前加低通滤波器防混叠
2、频谱泄漏：DFT对时域信号进行了截断（相当于采样信号乘了一个窗函数），时域的乘积相当于频域卷积，改变了原信号频谱。
改用其他窗函数（非矩形）改善泄漏。
3、栅栏现象：DFT 只给出了频谱在采样点上的取值，采样点间的频谱内容丢失。-DFT spectrum analysis of a three phenomena, aliasing : continuous signal sampling, requiring continuous signal is band-limited, the sampling frequency should be high enough. Fs meet the Nyquist Sampling Theorem would not have aliasing. Sampling former low-pass filter plus anti-aliasing 2, spectrum leakage : DFT right time domain signal a disconnect (equivalent to a sampling signal by a window function). time domain is equivalent to the product of frequency-domain convolution, changes in the spectrum of the original signal. Window functions to switch to other (non-rectangular) to improve leakage. 3, fenced phenomenon : DFT spectrum is given only at the sampling point value, sampling points of the spectrum as lost.
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Size: 148480 |
Author: qinyang |
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Description: 这是一个经典的把matlab应用于DFT的例子,适合于初学者-This is a classic application of Matlab put DFT example, suitable for beginners
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Size: 1024 |
Author: |
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Description: 使用MATLAB函数中的FFT命令计算离散时间信号的频谱，以加深对离散信号的DFT的理解及其FFT算法的运用。-using MATLAB function FFT calculation order discrete-time signal spectrum, to increase the discrete signals in the DFT and FFT algorithm understanding of the application.
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Size: 29696 |
Author: tintin |
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Description: dft波束形成程序，空间波束形成，在雷达、声纳行业中有广泛应用-P <0.05 beam forming processes, space beam forming, in radar, sonar sectors which have wider application
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Size: 1024 |
Author: 时节 |
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Description: 用matlab编写的对水印加入Arnold变换和对图像载体进行DFT变换的水印程序，很有用哦-Used for watermarking matlab prepared to join Arnold transformation and the image carrier to carry out DFT transform watermarking procedure Oh very useful
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Size: 2048 |
Author: 张燕 |
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Description: 用matlab进行FFT及DFT算法的实现，并测试其运行速度。-Using matlab for FFT and DFT algorithm and test its speed.
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Size: 1024 |
Author: miao |
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Description: 一个基于DFT的水印算法源码；其中有嵌入，提取，测试图片；还有攻击程序，可以用来测试-DFT-based Watermarking Algorithm source including embedding, extraction, testing picture there are attacks on the procedures that can be used to test
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Size: 101376 |
Author: shen xu |
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Description: 基于DFT的瞬时测频算法，及插值算法，最后由图形表示测频结果。-Based on the Instantaneous Frequency Measurement DFT algorithm, and the interpolation algorithm, and finally by the graphical representation of frequency measurement results.
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Size: 1024 |
Author: 赵琦 |
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Description: 加arnold置乱的数字水印在matlab下的ＤＦＴ仿真实现整个程序运行还行，共享给大家-jpeg of the Matlab Simulation, and the whole process has run OK, for everyone to share -Add arnold Scrambling of digital watermarking in matlab under the DFT simulation run also realize the whole process line, to share to everyone-jpeg of the Matlab Simulation, and the whole process has run OK, for everyone to share
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Size: 2048 |
Author: 小户 |
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Description: DFT：离散傅立叶变换
符运行后得频谱图-DFT: Discrete Fourier Transform running at a frequency spectrum
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Size: 7168 |
Author: chemmy |
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Description: 实现离散傅立叶变换DFT 最后分析得到频谱幅度 相位-Discrete Fourier Transform DFT realize the final analysis of phase-amplitude spectrum
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Size: 3559424 |
Author: stream |
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Description: 基于DCT,DFT,DWT等的水印算法，还有加置乱的水印算法，用于图像处理方面-Based on the DCT, DFT, DWT, such as the watermarking algorithm, as well as increase the watermark scrambling algorithm, for image processing
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Size: 16384 |
Author: 孔萍萍 |
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Description: 分四种情况实现fft
分别是时间抽取递归 、时间抽取循环、频率抽取递归和频率抽取循环
以及附带dft的算法描述-Fft realize sub-four cases were collected recursive time, time taken from the cycle, frequency and frequency of samples taken from recursive cycle, as well as incidental DFT algorithm described
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Size: 1024 |
Author: didi |
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Description: 数字信号处理基于matlab 文件内容
/conv(卷积部分)
dupconv 重叠保留法
freqcirconv 频域圆周卷积
freqconv 频域卷积
timecirconv 时域圆周卷积
timeconv 时域卷积
/fft(频域分析部分)
d2fft 基2FFT
dft DFT最简化程序
dtft DTFT演示
/fir(fir滤波器设计)
fir 得到fir滤波器hn
getwindow 得到fir滤波器窗函数wn
idealfilter 理想滤波器(低通,高通,带通)hdn
idealhd 理想低通滤波器
/fir gui(fir滤波器GUI设计)
gui_top 总图
gui_fir fir滤波器GUI
gui_sigout 选择信号GUI
/power caculate(功率谱分析)
directpower 直接谱分析
indirectpower 间接谱分析(估计谱分析)
noise 噪声谱分析
/sigout(常见信号产生)
sigout 离散信号产生-Digital signal processing matlab based on the content of the document/conv (convolution part) dupconv law of reservations freqcirconv overlapping frequency domain circular convolution freqconv frequency domain convolution timecirconv time-domain circular convolution timeconv time-domain convolution/fft (frequency domain analysis part) d2fft base 2FFT dft DFT the most simplified procedure dtft DTFT demo/fir (fir filter design) fir be fir filter hn getwindow be fir filter window function wn idealfilter ideal filter (low pass, high pass, band-pass) hdn idealhd ideal low-pass Filter/fir gui (fir filter GUI design) gui_top general layout gui_fir fir filter selection GUI gui_sigout signal GUI/power caculate (power spectrum analysis) directpower direct spectral analysis indirectpower indirect spectral analysis (spectral analysis estimated) noise noise spectrum analysis/sigout (common signals) sigout discrete signals
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Size: 36864 |
Author: 芦达 |
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Description: 图像处理中的图像变换的源码与变换后的结果图，包括dct变换，dft变换，w-h变换等-Image Processing Image Transform source and transform the result of plans, including the DCT transform, dft transform, wh transform
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Size: 2068480 |
Author: hs |
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Description: Single Carrier FDMA又称SC-FDMA或者DFT-Spread-OFDM是3GPP LTE最新提出的适用于上行传输的一种新方案。相对于OFDMA（主要用于下行），其最大的优势在于低峰值平均功率比（即PAPR）。本程序包括OFDMA，SC-FDE（单载波频域均衡）以及SC-FDMA程序，接收端采用经典的ZF和MMSE检测算法，程序短小精悍，相当经典，方便该领域的人学习与研究。-Single Carrier FDMA or SC-FDMA, also known as DFT-Spread-OFDM is the latest 3GPP LTE uplink transmission for a new program. Compared to OFDMA (mainly used for the downlink), the biggest advantage lies in its low peak-average power ratio (ie, PAPR). This procedure, including OFDMA, SC-FDE (single carrier frequency domain equalization), as well as SC-FDMA procedure, the receiving end the use of classical ZF and MMSE detection algorithm, procedures dapper, very classic, convenient in the field to learn and research.
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Size: 50176 |
Author: 程鹏 |
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Description: 利用DFT分析模拟信号频谱,并附有实验报告说明和源码-DFT analysis of the use of analog signal spectrum, together with the experimental report and source
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Size: 80896 |
Author: 曾明 |
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Description: 计算循环卷积，DFT，IDFT,FFT... ..
-Computing cyclic convolution, DFT, IDFT, FFT ... ..
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Size: 2048 |
Author: 徐建国 |
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Description: 计DFT，IDFT,FFT,循环卷积，循环移位以及重叠保留法-Of DFT, IDFT, FFT, cyclic convolution, cyclic shift and overlap to retain the Law
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Size: 3072 |
Author: 徐建国 |
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Description: 使用matlab对正弦信号采样 以及对其进行DFT变换-Matlab sinusoidal signal on the use of sampling, as well as its DFT transform
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Size: 38912 |
Author: 史惠 |
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