ppfx.m

信号实验常用的simulink模型和mfile,可直接在matlan下运行。

function [ret,x0,str,ts,xts]=ppfx(t,x,u,flag);
%PPFX	is the M-file description of the SIMULINK system named PPFX.
%	The block-diagram can be displayed by typing: PPFX.
%
%	SYS=PPFX(T,X,U,FLAG) returns depending on FLAG certain
%	system values given time point, T, current state vector, X,
%	and input vector, U.
%	FLAG is used to indicate the type of output to be returned in SYS.
%
%	Setting FLAG=1 causes PPFX to return state derivatives, FLAG=2
%	discrete states, FLAG=3 system outputs and FLAG=4 next sample
%	time. For more information and other options see SFUNC.
%
%	Calling PPFX with a FLAG of zero:
%	[SIZES]=PPFX([],[],[],0),  returns a vector, SIZES, which
%	contains the sizes of the state vector and other parameters.
%		SIZES(1) number of states
%		SIZES(2) number of discrete states
%		SIZES(3) number of outputs
%		SIZES(4) number of inputs
%		SIZES(5) number of roots (currently unsupported)
%		SIZES(6) direct feedthrough flag
%		SIZES(7) number of sample times
%
%	For the definition of other parameters in SIZES, see SFUNC.
%	See also, TRIM, LINMOD, LINSIM, EULER, RK23, RK45, ADAMS, GEAR.

% Note: This M-file is only used for saving graphical information;
%       after the model is loaded into memory an internal model
%       representation is used.

% the system will take on the name of this mfile:
sys = mfilename;
new_system(sys)
simver(1.3)
if (0 == (nargin + nargout))
     set_param(sys,'Location',[117,48,530,308])
     open_system(sys)
end;
set_param(sys,'algorithm',     'RK-45')
set_param(sys,'Start time',    '0.0')
set_param(sys,'Stop time',     '40')
set_param(sys,'Min step size', '0.001')
set_param(sys,'Max step size', '0.01')
set_param(sys,'Relative error','1e-3')
set_param(sys,'Return vars',   '')

add_block('built-in/Zero-Pole',[sys,'/',['  巴特沃斯低通',13,'  滤波器']])
set_param([sys,'/',['  巴特沃斯低通',13,'  滤波器']],...
		'Font Name','宋体',...
		'Font Size',12,...
		'Zeros','z',...
		'Poles','p',...
		'Gain','k',...
		'Mask Display','plot(20*log10(w),20*log10(abs(h)))',...
		'Mask Type','buttap')
set_param([sys,'/',['  巴特沃斯低通',13,'  滤波器']],...
		'Mask Dialogue','Analog Butterworth low pass filter.\n\n(Requires Signal Processing Toolbox)|Cutoff frequency (rad/sec)|Order')
set_param([sys,'/',['  巴特沃斯低通',13,'  滤波器']],...
		'Mask Translate','[z,p,k]=buttap(@2); z=@1*z; p=@1*p; k=real(prod(-p)); [num,den]=zp2tf(z,p,k); w=logspace(log10(@1/10),log10(10*@1),20); h=freqs(num,den,w); ')
set_param([sys,'/',['  巴特沃斯低通',13,'  滤波器']],...
		'Mask Help','Butterworth low pass filter using MATLAB''s butter command.',...
		'Mask Entries','200\/4\/',...
		'position',[145,138,205,182])

add_block('built-in/Signal Generator',[sys,'/','信号发生器'])
set_param([sys,'/','信号发生器'],...
		'Font Name','宋体',...
		'Font Size',12,...
		'Peak','1.000000',...
		'Peak Range','5.000000',...
		'Freq','5.000000',...
		'Freq Range','50.000000',...
		'Wave','Sqr',...
		'Units','Rads')
set_param([sys,'/','信号发生器'],...
		'position',[55,143,100,177])

add_block('built-in/Scope',[sys,'/',['示波器',13,'（输入信号）']])
set_param([sys,'/',['示波器',13,'（输入信号）']],...
		'Font Name','宋体',...
		'Font Size',12,...
		'Vgain','1.500000',...
		'Hgain','30.000000',...
		'Vmax','3.000000',...
		'Hmax','60.000000',...
		'Window',[397,405,729,556])
set_param([sys,'/',['示波器',13,'（输入信号）']],...
		'position',[290,27,320,63])


%     Subsystem  '   频谱分析'.

new_system([sys,'/','   频谱分析'])
set_param([sys,'/','   频谱分析'],'Location',[0,0,276,140])

add_block('built-in/S-Function',[sys,'/',['   频谱分析/S-function block ',13,'which calls M-file']])
set_param([sys,'/',['   频谱分析/S-function block ',13,'which calls M-file']],...
		'function name','sfunpsd',...
		'parameters','fftpts,npts,HowOften,offset,ts,0',...
		'position',[160,46,210,84])

add_block('built-in/Inport',[sys,'/','   频谱分析/input signal'])
set_param([sys,'/','   频谱分析/input signal'],...
		'position',[50,55,70,75])
add_line([sys,'/','   频谱分析'],[75,65;155,65])
set_param([sys,'/','   频谱分析'],...
		'Mask Display','plot(0,0,100,100,[14,91,91,14,14],[86,86,40,40,86],[85,82,80,79,75,67,63,60,57,53,41,36,33,27,24],[49,50,53,50,49,51,54,66,54,50,50,52,81,51,49])',...
		'Mask Type','Spectrum analyzer.')
set_param([sys,'/','   频谱分析'],...
		'Mask Dialogue','Spectrum analyser using graph window.|Length of buffer:|Number of points for fft:|Plot after how many points:|Sample time:')
set_param([sys,'/','   频谱分析'],...
		'Mask Translate','npts=@1; fftpts=@2; HowOften=@3; ts=@4(1); if length(@4) > 1, offset = @4(2), else, offset = 0; end')
set_param([sys,'/','   频谱分析'],...
		'Mask Help','This block when hooked to the output of a system displays the frequency content of the buffer in the graph window. For more see the M-file specanal.',...
		'Mask Entries','256\/512\/64\/0.1\/')


%     Finished composite block '   频谱分析'.

set_param([sys,'/','   频谱分析'],...
		'Font Name','宋体',...
		'Font Size',12,...
		'Drop Shadow',4,...
		'position',[295,110,325,150])

add_block('built-in/Scope',[sys,'/',['示波器',13,'（输出信号）']])
set_param([sys,'/',['示波器',13,'（输出信号）']],...
		'Font Name','宋体',...
		'Font Size',12,...
		'Vgain','1.500000',...
		'Hgain','30.000000',...
		'Vmax','3.000000',...
		'Hmax','60.000000',...
		'Window',[4,384,336,546])
set_param([sys,'/',['示波器',13,'（输出信号）']],...
		'position',[300,177,330,213])
add_line(sys,[105,160;140,160])
add_line(sys,[210,160;240,160;240,130;290,130])
add_line(sys,[240,160;240,195;295,195])
add_line(sys,[115,160;115,45;285,45])

drawnow

% Return any arguments.
if (nargin | nargout)
	% Must use feval here to access system in memory
	if (nargin > 3)
		if (flag == 0)
			eval(['[ret,x0,str,ts,xts]=',sys,'(t,x,u,flag);'])
		else
			eval(['ret =', sys,'(t,x,u,flag);'])
		end
	else
		[ret,x0,str,ts,xts] = feval(sys);
	end
else
	drawnow % Flash up the model and execute load callback
end