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DFT进行频谱分析时的三种现象
- 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
keyasuochuangan
- 对可压缩的信号可通过远低于Nyquist标准的方式进行采样数据,仍能够精确地恢复出原始信号,对图像处理具有重要意义。-On the compressible signals can be well below the Nyquist sampling data standard manner, is still able to accurately restore the original signal, the image processing is important.
CS_OMP
- 压缩传感,MATLAB,信号重建,正交匹配追踪,打破乃奎斯特定理-Compressed sensing, MATLAB, signal reconstruction, orthogonal matching pursuit, breaking the Nyquist Theorem
tutorial-compression-perception
- tutorial压缩感知代码。压缩感知,又称压缩采样,压缩传感。它作为一个新的采样理论,它通过开发信号的稀疏特性,在远小于Nyquist 采样率的条件下,用随机采样获取信号的离散样本,然后通过非线性重建算法完美的重建信号-The tutorial compression-aware code. Compressed sensing, also known as compressed sampling, compressed sensing. It as a new sampling theory
Wavelet_OMP_WD
- 压缩感知,通过开发信号的稀疏特性,在远小于Nyquist 采样率的条件下,用随机采样获取信号的离散样本,然后通过非线性重建算法完美的重建信号-Compressed sensing, through the development of signal sparse characteristics, in the condition of far less than the Nyquist sampling rate, the use of random sampling to obtain the
demo_video
- 基于立体块的压缩视频感知。然后分别对测量值的全局置乱和采样率的重新分配处理进行了介绍,其中,解码端通过对堆叠测量向量进行全局随机置乱,增强了对帧间结构特性的利用,置乱后测量向量的性质接近于同时多帧测量的测量向量,改善了单纯堆叠测量向量时低采样率下的解码性能-Compressed sensing (CS) breaks the limits of Nyquist sampling rate and achieves a direct sampling for information. Compre
Nyquist
- matlab中的nyquist图像程序,可以进行参数处理,进一步得出结论。(The Nyquist image program in Matlab can carry out parameter processing and draw a conclusion further.)
Nyquist
- matlab中的nyquist图像程序,可以进行参数处理.(The Nyquist image program in Matlab can carry out parameter processing .)
