function [sig,iflaws]=griffitc(N,SNR);%GRIFFITC Test signal example C of Griffiths' paper. %	[SIG,IFLAWS]=GRIFFITC(N,SNR) generates the test signal of  %	the example C of the paper of Griffiths.%%	N      : signal length         (default: 200)%	SNR    : signal to noise ratio (default: 25 dB)%	SIG    : output signal%	IFLAWS : instantaneous frequency laws of the 3 components%%	Example :%	 [sig,iflaws]=griffitc; plotifl(1:200,iflaws); grid;%	F. Auger, July 1995.%	Copyright (c) 1996 by CNRS (France).%	Ref: L.J. Griffiths, "Rapid measurement of digital instantaneous%	  frequency", IEEE Trans on ASSP, Vol 23, No 2, pp 207-222, 1975.%%	------------------- CONFIDENTIAL PROGRAM -------------------- %	This program can not be used without the authorization of its%	author(s). For any comment or bug report, please send e-mail to %	f.auger@ieee.org if (nargin==0), N=200; SNR=25;elseif (nargin==1), SNR=25;end;[sig1,iflaw1]=fmsin(N,0.25-0.08,0.25+0.08,192.6,50,0.285,+1);[sig2,iflaw2]=fmsin(N,0.28-0.03,0.28+0.03,110.6,50,0.294,-1);[sig3,iflaw3]=fmsin(N,0.40-0.02,0.40+0.02,149.6,50,0.417,-1);noise=hilbert(randn(N,1));sig=sigmerge(sig1+sig2+sig3,noise,SNR);if (nargout==2), iflaws=[iflaw1 iflaw2 iflaw3];end;