fah.m

来自「最新的HHT时频分析程序By Huang and Wu」· M 代码 · 共 24 行

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

% The function FAH calculates an improved Hilbert frequency and amplitude
% of data(n,k), where n specifies the length of time series, and 
% k is the number of IMF components.
% Regular Hilbert transform is used to perform a Hilbert transform.
%
% Non MATLAB Library routine used in the function is: HILBTM.
% Note: FAH allows the instantaneous frequency to be negative. 
%
% Calling sequence-
% [f,a] = fah(data,dt)
%
% Input-
%   data	- 2-D matrix data(n,k) of IMF components 
%	dt	    - sampling period in seconds
% Output-
%	f	    - 2-D matrix f(n,k) that specifies the Hilbert frequency in Hz
%	a	    - 2-D matrix a(n,k) that specifies the Hilbert amplitude
%
% Used by-
% 	FA, NSPABMUN.