% Zero-crossing Frequency Estimation
%
% Estimates the instantaneous frequency of the input signal using the
% zero-crossing instantaneous frequency estimation algorithm.
%
%
% Usage:
%
%     ife = zce( signal, window_length )
%
% Parameters:
%
%
%    signal
%
%	  Input one dimensional signal to be analysed.
%
%    window_length
%
%	  Moving window to count the average number of zero crossings each
%	  time it moves.
%
%
% TFSAP 7.0
% Copyright Prof. B. Boashash
% Qatar University, Doha
% email: tfsap.research@gmail.com
