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。
资源文件列表
package_emd/bugfix.sh , 216
package_emd/EMDs/cemdc.dll.dll , 18432
package_emd/EMDs/cemdc.dll.exp , 46
package_emd/EMDs/cemdc.dll.lib , 2638
package_emd/EMDs/cemdc.m , 2354
package_emd/EMDs/cemdc2.dll.dll , 16384
package_emd/EMDs/cemdc2.dll.exp , 47
package_emd/EMDs/cemdc2.dll.lib , 2638
package_emd/EMDs/cemdc2.m , 2362
package_emd/EMDs/cemdc2_fix.dll.dll , 15872
package_emd/EMDs/cemdc2_fix.dll.exp , 51
package_emd/EMDs/cemdc2_fix.dll.lib , 2646
package_emd/EMDs/cemdc2_fix.m , 2312
package_emd/EMDs/cemdc_fix.dll.dll , 17920
package_emd/EMDs/cemdc_fix.dll.exp , 50
package_emd/EMDs/cemdc_fix.dll.lib , 2646
package_emd/EMDs/cemdc_fix.m , 2305
package_emd/EMDs/emd.m , 22275
package_emd/EMDs/emdc.dll.dll , 15360
package_emd/EMDs/emdc.dll.exp , 45
package_emd/EMDs/emdc.dll.lib , 2634
package_emd/EMDs/emdc.m , 2280
package_emd/EMDs/emdc_fix.dll.dll , 14336
package_emd/EMDs/emdc_fix.dll.exp , 49
package_emd/EMDs/emdc_fix.dll.lib , 2642
package_emd/EMDs/emdc_fix.m , 2141
package_emd/EMDs/emd_local.m , 9897
package_emd/EMDs/emd_online.m , 26315
package_emd/EMDs/make_emdc.m , 1361
package_emd/EMDs/src/cemdc.c , 4969
package_emd/EMDs/src/cemdc2.c , 4983
package_emd/EMDs/src/cemdc2_fix.c , 4213
package_emd/EMDs/src/cemdc_fix.c , 4224
package_emd/EMDs/src/cextr.c , 14711
package_emd/EMDs/src/cextr.h , 770
package_emd/EMDs/src/cio.c , 7562
package_emd/EMDs/src/cio.h , 1190
package_emd/EMDs/src/cio_fix.c , 6933
package_emd/EMDs/src/cio_fix.h , 1117
package_emd/EMDs/src/clocal_mean.c , 5085
package_emd/EMDs/src/clocal_mean.h , 790
package_emd/EMDs/src/clocal_mean2.c , 4905
package_emd/EMDs/src/clocal_mean2.h , 752
package_emd/EMDs/src/emdc.c , 4711
package_emd/EMDs/src/emdc_fix.c , 3517
package_emd/EMDs/src/emd_complex.c , 508
package_emd/EMDs/src/emd_complex.h , 512
package_emd/EMDs/src/extr.c , 10473
package_emd/EMDs/src/extr.h , 674
package_emd/EMDs/src/interpolation.c , 2110
package_emd/EMDs/src/interpolation.h , 468
package_emd/EMDs/src/io.c , 7029
package_emd/EMDs/src/io.h , 1165
package_emd/EMDs/src/io_fix.c , 6188
package_emd/EMDs/src/io_fix.h , 1092
package_emd/EMDs/src/local_mean.c , 2838
package_emd/EMDs/src/local_mean.h , 710
package_emd/examples/NSIP2003/emd_fmsin.m , 1866
package_emd/examples/NSIP2003/emd_sampling.m , 896
package_emd/examples/NSIP2003/emd_separation.m , 1334
package_emd/examples/NSIP2003/emd_triang.m , 704
package_emd/examples/NSIP2003/ex_online.m , 2065
package_emd/examples/NSIP2003/triangular_signal.m , 378
package_emd/examples/SPL2007/bivariate_EMD_illustration.m , 1277
package_emd/examples/SPL2007/bivariate_EMD_mean_definitions.m , 2977
package_emd/examples/SPL2007/bivariate_EMD_principle.m , 3936
package_emd/examples/SPL2007/dirstretch.m , 614
package_emd/examples/SPL2007/float_position_record.mat , 8545
package_emd/index_emd.m , 4483
package_emd/install_emd.m , 1562
package_emd/ls-R , 1004
package_emd/revert_bugfix.sh , 216
package_emd/uninstall_emd.m , 2128
package_emd/utils/addtag.m , 791
package_emd/utils/boundary_conditions_emd.m , 3546
package_emd/utils/cemd_disp.m , 2547
package_emd/utils/cemd_visu.m , 2823
package_emd/utils/cenvelope.m , 2053
package_emd/utils/dirstretch.m , 1248
package_emd/utils/disp_hhs.m , 1583
package_emd/utils/emd_visu.m , 3216
package_emd/utils/extr.m , 1938
package_emd/utils/findtag.m , 1044
package_emd/utils/hastag.m , 659
package_emd/utils/hhspectrum.m , 1445
package_emd/utils/io.m , 504
package_emd/utils/plot3c.m , 798
package_emd/utils/plotc.m , 3243
package_emd/utils/rmtag.m , 820
package_emd/utils/toimage.m , 3003