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[Algorithm] FFT DL : 0: 基4的FFT算法程序，它是要通过将长度为N的数据序列转化成大小为4的DFT来实现高速化。从理论上讲，它比执行时间缩短为基2的FFT的3/4。该程序性能优越，可用性很强。下载即可用！-4 FFT algorithm based procedures, it is to be adopted will be a length of N data sequence into a size of 4 to achieve high-speed DFT. In theory, shorter than the execution time of FFT-based 2 of 3/4. The superior performance, availability, very strong. Can be used to download!
Update : 2025-02-17 Size : 1kb Publisher : jojocheng
[matlab] signal_analyzer DL : 0: 最近看到有人提问怎样用FFT实现频谱分析，我认为能够进行到频谱分析的人，对于系统研究的深度基本上已经相当不错了。本人今天做了一个例程，发给大家参考一下。历程主要内容(signal_analyzer.rar)如下： test1.txt 第一列为时间t，0.001s为步长；第二列为系统的输入信号；第三列为系统的输出信号。 signal_analyzer.m首先将test1.txt 的数据读入workspace，然后进行FFT，分析出两信号的频率，输出对于输入的幅值衰减（db），输出对输入的相位差。-The question was asked recently to see the realization of how to use FFT spectral analysis, I think that spectral analysis can be carried out to those who study the depth of the system basically is already quite good. Today I made a routine, distributed to Members for reference. The main contents of the course (signal_analyzer.rar) are as follows: test1.txt the first time as t, 0.001s for the step the second as the system input signal the third as a system output signal. signal_analyzer.m first test1.txt data read into workspace, and then proceed to FFT, analysis of the two signal frequency, output amplitude for input attenuation (db), the output of the input phase difference.
Update : 2025-02-17 Size : 6kb Publisher : 李小明
[Algorithm] fftbianhuan DL : 0: test1.txt 第一列为时间t，0.001s为步长；第二列为系统的输入信号；第三列为系统的输出信号。 signal_analyzer.m首先将test1.txt 的数据读入workspace，然后进行FFT，分析出两信号的频率，输出对于输入的幅值衰减（db），输出对输入的相位差。-test1.txt the first time as t, 0.001s for the step the second as the system input signal the third as the system output signal. signal_analyzer.m first test1.txt data read workspace, and then proceed to FFT, analysis of the two signals in the frequency, the output for input amplitude attenuation (db), the output of the input phase difference.
Update : 2025-02-17 Size : 1kb Publisher : 王将
[matlab] signal_analyzer(1) DL : 0: 主要内容(signal_analyzer.rar)如下： test1.txt 第一列为时间t，0.001s为步长；第二列为系统的输入信号；第三列为系统的输出信号。 signal_analyzer.m首先将test1.txt 的数据读入workspace，然后进行FFT，分析出两信号的频率，输出对于输入的幅值衰减（db），输出对输入的相位差。 -Main Content (signal_analyzer.rar) as follows: test1.txt the first time as t, 0.001s for the step the second as the input signal the third as the system output signal. signal_analyzer.m first test1.txt the data read into the workspace, and then FFT, the frequency of the two signals, the output amplitude for input attenuation (db), the output of the input phase difference.
Update : 2025-02-17 Size : 6kb Publisher : 周捷
[matlab] fftplot DL : 0: compute and/or plot the magnitude in dB and phase in degrees of the FFT data in Y
Update : 2025-02-17 Size : 1kb Publisher : david
[matlab] $R8SOOS0 DL : 0: 随机产生一次数据x=randn（1，1024*8）对这个序列进行FFT然后求功率谱密度。应用MATLAB画出来横坐标为频率（Frequency(hz)））纵坐标为功率谱密度（Power Spectrum Density） (dB))的图形(Randomly generate a data x=randn (11024*8) to carry out FFT for this sequence and then obtain power spectral density. Drawing the abscissa as the frequency (Frequency (Hz)) and drawing the vertical coordinate as Power Spectrum Density (dB) by MATLAB.)
Update : 2025-02-17 Size : 10kb Publisher : 盐水鱼