pchipnormalize.m

最新的HHT时频分析程序By Huang and Wu

function [data,a]=hermitenormalize(data)
 
% The function HERMITENORMALIZE normalizes with cubic hermite interpolation (pchip),
% which mainly to avoid the overshot of cubic spline interpolation,
% especially when using the EEMD method,
% the data(n,m) where n specifies the number of time points, 
% and m is the number of IMF components.
% The normalization is carried out with both maxima and minima; hence emax
% is taken as the absolute sign.
%
% Calling sequence-
% [data,a]=hermitenormalize(data)
%
% Input-
%	data	- 2-D matrix data(n,m) that specifies the IMF components 
% Output-
%	data	- normalized data
%	a	    - splined envelope
%
% Used by-
%	FA

% Xianyao Chen     Sep. 20 created following the splinenormalize.m
%