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Description: 本文通过matlab分析信号在不同采样频率和变换点数的FFT下的频谱图，研究采样频率和变换点数对信号FFT的影响。同时还讨论了信号在不同频带噪声背景下的采样频率和变换点数的选择。-In this paper, matlab sampling frequency of the signal at different points in the FFT and transform under the frequency spectrum, change the sampling frequency and FFT of the signal points. Also discussed the noise signal in the context of different frequency bands and transform points sampling frequency selection.
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Size: 136192 |
Author: hzz |
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Description: 短时傅里叶变换 快速傅里叶变换对音频信号处理 频谱分析-fast fft
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Size: 2048 |
Author: fangxujun |
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Description: 对一个模拟信号进行fft变换，并求出其幅值图和相位图，对于fft初学者会有一定的用途-An analog signal fft transform, and find its magnitude and phase diagrams, for beginners there will be some use of fft
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Size: 1024 |
Author: 李酷 |
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Description: 进行傅里叶分析和频谱分析，可以对所得的波形进行时频分析-Fourier analysis and spectrum analysis, frequency analysis can be carried out on the resulting waveform
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Size: 1024 |
Author: 晶晶 |
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Description: Hilbert变换只是单纯地求信号的瞬时振幅，频率和相位，有可能出现没有意义的负频率；HHT变换先将信号进行EMD分解，得到的是各个不同尺度的分量，对每一个分量进行Hilbert变换后得到的是有实际意义的瞬时频率。
-imagesc(t,fliplr((1:size(im,1))/(2*size(im,1))),im,[inf,0])
set(gca, YDir , normal )
xlabel([ time ])
ylabel([ normalized frequency ])
title( Hilbert-Huang spectrum )
function [f,z]=fftfenxi(t,y)
L=length(t) N=2^nextpow2(L)
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Size: 2048 |
Author: 景小兵 |
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Description: 基于MATLAB编写的快速傅里叶变换的程序-MATLAB-based programs written in the fast Fourier transform
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Size: 3072 |
Author: 孙国富 |
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Description: 这个是对一般信号进行快速傅里叶分析。并画出其幅频图和相频图。与原信号进行比较-This is the general signal fast Fourier analysis. And draw the amplitude frequency and phase frequency diagram. Comparing with the original signal
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Size: 2048 |
Author: 傅亚玲 |
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