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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
main
- 信号、系统及系统响应:[1]:时域采样序列分析[2]:系统和响应分析[3]:卷积定理验证
CWsinal
- matlab绘制CW信号的时域波形,同时对信号进行频谱分析,并考察采样频率以及信噪比对频谱分析的影响。-matlab draw CW signal time-domain waveform, and spectral analysis of signals and the sampling frequency and signal to noise ratio study of the impact of spectrum analysis.
LPM
- 用matlab绘制线性调频信号的时域波形,同时对信号进行频谱分析,并考察采样频率以及信噪比对频谱分析的影响。-Matlab drawing with linear frequency modulation signal time-domain waveform, and spectral analysis of signals and the sampling frequency and signal to noise ratio study of the impact of spectrum
Nonsampling_Contourlet
- 非下采样contourlet变换是一种较新的多尺度几何分析方法,能够很好地描述信号的线奇异特征,具有多方向滤波器组。-Nonsubsampled contourlet transform is a relatively new method of multiscale geometric analysis, can well describe the signal characteristics of the line singularity, with multi-directional fi
Sparse-and-Redundant-Representations
- 这本教科书,介绍了稀疏和多余的申述,对信号和图像处理应用的重点。的理论和数值基础处理前的应用进行了讨论。信号源的数学建模一起讨论如何使用适当的模型,如去噪,恢复,分离,插值和外推法,压缩,采样,分析和合成,检测,识别,多任务。这次报告会是优雅和迷人的。-Sparse and Redundant Representations From Theory to Applications in Signal and Image Processing
Electroencephalogram
- 设计MATLAB程序对EEG信号进行读取,并在此基础上对EEG信号进行采样、功率谱分析和去噪等处理。(The MATLAB program is designed to read the EEG signal, and on this basis, the EEG signal is sampled, the power spectrum analysis and the denoising are processed.)