文件名称:package_emd
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经验模态分解(Empirical Mode Decomposition,EMD)法是黄锷(N. E. Huang)在美国国家宇航局与其他人于1998年创造性地提出的一种新型自适应信号时频处理方法,特别适用于非线性非平稳信号的分析处理。对经过EMD处理的信号再进行希尔伯特变换,就组成了大名鼎鼎的“希尔伯特—黄变换”(HHT)。由于脑电信号处理很少在EMD之后接上希尔伯特变换,在这里仅介绍EMD的相关基础知识。
EMD其实就是一种对信号进行分解的方法,与傅里叶变换、小波变换的核心思想一致,大家都想将信号分解为各个相互独立的成分的叠加;只不过傅里叶变换以及小波变换都要求要有基函数,而EMD却完全抛开了基函数的束缚,仅仅依据数据自身的时间尺度特征来进行信号分解,具备自适应性。由于无需基函数,EMD几乎可以用于任何类型信号的分解,尤其是在非线性、非平稳信号的分解上具有明显的优势。
EMD的目的是将信号分解为多个本征模函数(IMF)的叠加。IMF必需要满足以下两个条件:
(1)函数在整个时间范围内,局部极值点和过零点的数目必须相等,或最多相差一个;
(2)在任意时刻点,局部最大值的包络(上包络线)和局部最小值的包络(下包络线) 平均必须为零。
(Empirical Mode Decomposition,EMD)
EMD其实就是一种对信号进行分解的方法,与傅里叶变换、小波变换的核心思想一致,大家都想将信号分解为各个相互独立的成分的叠加;只不过傅里叶变换以及小波变换都要求要有基函数,而EMD却完全抛开了基函数的束缚,仅仅依据数据自身的时间尺度特征来进行信号分解,具备自适应性。由于无需基函数,EMD几乎可以用于任何类型信号的分解,尤其是在非线性、非平稳信号的分解上具有明显的优势。
EMD的目的是将信号分解为多个本征模函数(IMF)的叠加。IMF必需要满足以下两个条件:
(1)函数在整个时间范围内,局部极值点和过零点的数目必须相等,或最多相差一个;
(2)在任意时刻点,局部最大值的包络(上包络线)和局部最小值的包络(下包络线) 平均必须为零。
(Empirical Mode Decomposition,EMD)
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下载文件列表
文件名 | 大小 | 更新时间 |
---|---|---|
package_emd | 0 | 2007-06-27 |
package_emd\bugfix.sh | 216 | 2007-06-27 |
package_emd\EMDs | 0 | 2018-04-14 |
package_emd\EMDs\cemdc.dll.dll | 18432 | 2018-04-14 |
package_emd\EMDs\cemdc.dll.exp | 46 | 2018-04-14 |
package_emd\EMDs\cemdc.dll.lib | 2638 | 2018-04-14 |
package_emd\EMDs\cemdc.m | 2354 | 2007-06-27 |
package_emd\EMDs\cemdc2.dll.dll | 16384 | 2018-04-14 |
package_emd\EMDs\cemdc2.dll.exp | 47 | 2018-04-14 |
package_emd\EMDs\cemdc2.dll.lib | 2638 | 2018-04-14 |
package_emd\EMDs\cemdc2.m | 2362 | 2007-06-27 |
package_emd\EMDs\cemdc2_fix.dll.dll | 15872 | 2018-04-14 |
package_emd\EMDs\cemdc2_fix.dll.exp | 51 | 2018-04-14 |
package_emd\EMDs\cemdc2_fix.dll.lib | 2646 | 2018-04-14 |
package_emd\EMDs\cemdc2_fix.m | 2312 | 2007-06-27 |
package_emd\EMDs\cemdc_fix.dll.dll | 17920 | 2018-04-14 |
package_emd\EMDs\cemdc_fix.dll.exp | 50 | 2018-04-14 |
package_emd\EMDs\cemdc_fix.dll.lib | 2646 | 2018-04-14 |
package_emd\EMDs\cemdc_fix.m | 2305 | 2007-06-27 |
package_emd\EMDs\emd.m | 22275 | 2007-06-27 |
package_emd\EMDs\emdc.dll.dll | 15360 | 2018-04-14 |
package_emd\EMDs\emdc.dll.exp | 45 | 2018-04-14 |
package_emd\EMDs\emdc.dll.lib | 2634 | 2018-04-14 |
package_emd\EMDs\emdc.m | 2280 | 2007-06-27 |
package_emd\EMDs\emdc_fix.dll.dll | 14336 | 2018-04-14 |
package_emd\EMDs\emdc_fix.dll.exp | 49 | 2018-04-14 |
package_emd\EMDs\emdc_fix.dll.lib | 2642 | 2018-04-14 |
package_emd\EMDs\emdc_fix.m | 2141 | 2007-06-27 |
package_emd\EMDs\emd_local.m | 9897 | 2007-06-27 |
package_emd\EMDs\emd_online.m | 26315 | 2007-06-27 |
package_emd\EMDs\make_emdc.m | 1361 | 2007-06-27 |
package_emd\EMDs\src | 0 | 2018-04-14 |
package_emd\EMDs\src\cemdc.c | 4969 | 2007-06-27 |
package_emd\EMDs\src\cemdc2.c | 4983 | 2007-06-27 |
package_emd\EMDs\src\cemdc2_fix.c | 4213 | 2007-06-27 |
package_emd\EMDs\src\cemdc_fix.c | 4224 | 2007-06-27 |
package_emd\EMDs\src\cextr.c | 14711 | 2007-06-27 |
package_emd\EMDs\src\cextr.h | 770 | 2007-06-27 |
package_emd\EMDs\src\cio.c | 7562 | 2007-06-27 |
package_emd\EMDs\src\cio.h | 1190 | 2007-06-27 |
package_emd\EMDs\src\cio_fix.c | 6933 | 2007-06-27 |
package_emd\EMDs\src\cio_fix.h | 1117 | 2007-06-27 |
package_emd\EMDs\src\clocal_mean.c | 5085 | 2007-06-27 |
package_emd\EMDs\src\clocal_mean.h | 790 | 2007-06-27 |
package_emd\EMDs\src\clocal_mean2.c | 4905 | 2007-06-27 |
package_emd\EMDs\src\clocal_mean2.h | 752 | 2007-06-27 |
package_emd\EMDs\src\emdc.c | 4711 | 2007-06-27 |
package_emd\EMDs\src\emdc_fix.c | 3517 | 2007-06-27 |
package_emd\EMDs\src\emd_complex.c | 508 | 2007-06-27 |
package_emd\EMDs\src\emd_complex.h | 512 | 2007-06-27 |
package_emd\EMDs\src\extr.c | 10473 | 2007-06-27 |
package_emd\EMDs\src\extr.h | 674 | 2007-06-27 |
package_emd\EMDs\src\interpolation.c | 2110 | 2007-06-27 |
package_emd\EMDs\src\interpolation.h | 468 | 2007-06-27 |
package_emd\EMDs\src\io.c | 7029 | 2007-06-27 |
package_emd\EMDs\src\io.h | 1165 | 2007-06-27 |
package_emd\EMDs\src\io_fix.c | 6188 | 2007-06-27 |
package_emd\EMDs\src\io_fix.h | 1092 | 2007-06-27 |
package_emd\EMDs\src\local_mean.c | 2838 | 2007-06-27 |
package_emd\EMDs\src\local_mean.h | 710 | 2007-06-27 |
package_emd\examples | 0 | 2007-06-27 |
package_emd\examples\NSIP2003 | 0 | 2007-06-27 |
package_emd\examples\NSIP2003\emd_fmsin.m | 1866 | 2007-06-27 |
package_emd\examples\NSIP2003\emd_sampling.m | 896 | 2007-06-27 |
package_emd\examples\NSIP2003\emd_separation.m | 1334 | 2007-06-27 |
package_emd\examples\NSIP2003\emd_triang.m | 704 | 2007-06-27 |
package_emd\examples\NSIP2003\ex_online.m | 2065 | 2007-06-27 |
package_emd\examples\NSIP2003\triangular_signal.m | 378 | 2007-06-27 |
package_emd\examples\SPL2007 | 0 | 2007-06-27 |
package_emd\examples\SPL2007\bivariate_EMD_illustration.m | 1277 | 2007-06-27 |
package_emd\examples\SPL2007\bivariate_EMD_mean_definitions.m | 2977 | 2007-06-27 |
package_emd\examples\SPL2007\bivariate_EMD_principle.m | 3936 | 2007-06-27 |
package_emd\examples\SPL2007\dirstretch.m | 614 | 2007-06-27 |
package_emd\examples\SPL2007\float_position_record.mat | 8545 | 2007-06-27 |
package_emd\index_emd.m | 4483 | 2007-06-27 |
package_emd\install_emd.m | 1562 | 2007-06-27 |
package_emd\ls-R | 1004 | 2007-06-27 |
package_emd\revert_bugfix.sh | 216 | 2007-06-27 |
package_emd\uninstall_emd.m | 2128 | 2007-06-27 |
package_emd\utils | 0 | 2007-06-27 |
package_emd\utils\addtag.m | 791 | 2007-06-27 |
package_emd\utils\boundary_conditions_emd.m | 3546 | 2007-06-27 |
package_emd\utils\cemd_disp.m | 2547 | 2007-06-27 |
package_emd\utils\cemd_visu.m | 2823 | 2007-06-27 |
package_emd\utils\cenvelope.m | 2053 | 2007-06-27 |
package_emd\utils\dirstretch.m | 1248 | 2007-06-27 |
package_emd\utils\disp_hhs.m | 1583 | 2007-06-27 |
package_emd\utils\emd_visu.m | 3216 | 2007-06-27 |
package_emd\utils\extr.m | 1938 | 2007-06-27 |
package_emd\utils\findtag.m | 1044 | 2007-06-27 |
package_emd\utils\hastag.m | 659 | 2007-06-27 |
package_emd\utils\hhspectrum.m | 1445 | 2007-06-27 |
package_emd\utils\io.m | 504 | 2007-06-27 |
package_emd\utils\plot3c.m | 798 | 2007-06-27 |
package_emd\utils\plotc.m | 3243 | 2007-06-27 |
package_emd\utils\rmtag.m | 820 | 2007-06-27 |
package_emd\utils\toimage.m | 3003 | 2007-06-27 |