faz.m

最新的HHT时频分析程序By Huang and Wu

function [f,a]=faz(data,dt)

% The function FAZ generates a frequency and amplitude using zero-crossing method 
% applied to data(n,k), where n specifies the length of time series, 
% and k is the number of IMFs.
% Non MATLAB Library routine used in the function is: FINDCRITICALPOINTS.
%
% Calling sequence-
% [f,a]=faz(data,dt)
%
% Input-
%	data	- 2-D matrix of IMF components 
%	dt	    - time increment per point
% Output-
%	f	    - 2-D matrix f(n,k) that specifies frequency
%	a	    - 2-D matrix a(n,k) that specifies amplitude
%
% Used by- 
%	FA
% See also-
% 	FAZPLUS, which in addition to frequency and amplitude, outputs
%	other fields.
 
% Kenneth Arnold (NASA GSFC)	Summer 2003, Modified