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    發(fā)布日期: 2021-01-01
  • 語言: 其他
  • 標(biāo)簽: emd??

資源簡(jiǎn)介

對(duì)imf做希爾伯特 fft,包括幅值和頻率的 包絡(luò)

資源截圖

代碼片段和文件信息

function?imf?=?emd(x)
%?Empiricial?Mode?Decomposition?(Hilbert-Huang?Transform)
%?EMD分解或HHT變換
%?返回值為cell類型,依次為一次IMF、二次IMF、...、最后殘差

x???=?transpose(x(:));
imf?=?[];
while?~ismonotonic(x)
????x1?=?x;
????sd?=?Inf;
????while?(sd?>?0.1)?||?~isimf(x1)
????????s1?=?getspline(x1);?????????%?極大值點(diǎn)樣條曲線
????????s2?=?-getspline(-x1);???????%?極小值點(diǎn)樣條曲線
????????x2?=?x1-(s1+s2)/2;
???????
????????sd?=?sum((x1-x2).^2)/sum(x1.^2);
????????x1?=?x2;
????end
???
????imf{end+1}?=?x1;
????x??????????=?x-x1;
end
imf{end+1}?=?x;

%?是否單調(diào)
function?u?=?ismonotonic(x)
u1?=?length(findpeaks(x))*length(findpeaks(-x));
if?u1?>?0
????u?=?0;
else
????u?=?1;
end

%?是否IMF分量
function?u?=?isimf(x)
N??=?length(x);
u1?=?sum(x(1:N-1).*x(2:N)?u2?=?length(find

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-04-09?15:08??EMD\
?????文件?????????227??2012-10-08?22:32??EMD\FFTAnalysis.m
?????文件?????????250??2012-10-08?22:33??EMD\HilbertAnalysis.m
?????文件????????1108??2012-10-08?22:32??EMD\emd.m
?????文件????????2501??2017-02-02?20:34??EMD\exe_emd_20170201.asv
?????文件????????2129??2017-04-09?15:08??EMD\exe_emd_20170201.m
?????文件????????2595??2017-04-05?09:00??EMD\exe_emd_20170201_moni.asv
?????文件?????????925??2012-10-08?22:30??EMD\findpeaks.asv
?????文件?????????925??2012-10-08?22:30??EMD\findpeaks.m
?????文件????????1445??2007-06-27?22:12??EMD\hhspectrum.m
?????文件????????3427??2005-10-13?23:15??EMD\instfreq.m
?????文件????????1721??2012-10-12?15:48??EMD\plot_hht.asv
?????文件????????1755??2017-02-04?12:04??EMD\plot_hht.m
?????文件?????????595??2012-10-11?22:50??EMD\test_bianjipu.m
?????文件????????1330??2017-01-26?17:01??EMD\test_emd.asv
?????文件?????????442??2012-10-13?09:01??EMD\test_emd_shu.asv
?????文件?????????274??2012-10-11?22:51??EMD\youyige_bianjipu.m

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