com_util.m

数字通信第四版原书的例程

function [ret,x0,str,ts,xts]=com_util(t,x,u,flag);
%COM_UTIL	is the M-file description of the SIMULINK system named COM_UTIL.
%	The block-diagram can be displayed by typing: COM_UTIL.
%
%	SYS=COM_UTIL(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 COM_UTIL 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 COM_UTIL with a FLAG of zero:
%	[SIZES]=COM_UTIL([],[],[],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',[490,42,968,748])
     open_system(sys)
end;
set_param(sys,'algorithm',     'RK-45')
set_param(sys,'Start time',    '0.0')
set_param(sys,'Stop time',     '999999')
set_param(sys,'Min step size', '0.0001')
set_param(sys,'Max step size', '10')
set_param(sys,'Relative error','1e-3')
set_param(sys,'Return vars',   '')
set_param(sys,'Nonreal-time start time','')
set_param(sys,'Real-time algorithm','')


%     Subsystem  ['Voltage-controlled',13,'oscillator'].

new_system([sys,'/',['Voltage-controlled',13,'oscillator']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator']],'Location',[290,299,749,446])

add_block('built-in/Fcn',[sys,'/',['Voltage-controlled',13,'oscillator/sin']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/sin']],...
		'Expr','Ac*sin(u[1]*pi2+Ph)',...
		'position',[285,25,410,55])


%     Subsystem  ['Voltage-controlled',13,'oscillator/Module',13,'Integrator'].

new_system([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],'Location',[329,75,754,212])

add_block('built-in/Outport',[sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/out_1']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/out_1']],...
		'position',[370,30,390,50])

add_block('built-in/Sum',[sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/Sum']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/Sum']],...
		'position',[195,30,215,50])

add_block('built-in/Constant',[sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/one']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/one']],...
		'orientation',3,...
		'move name',0,...
		'position',[70,55,90,75])

add_block('built-in/Reset Integrator',[sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/Reset',13,'integrator']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/Reset',13,'integrator']],...
		'position',[110,19,150,51])

add_block('built-in/Fcn',[sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/module']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/module']],...
		'Expr','rem(u[1],modu)',...
		'position',[235,29,325,51])

add_block('built-in/Memory',[sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/Memory']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/Memory']],...
		'orientation',2,...
		'x0','init',...
		'position',[210,75,260,105])

add_block('built-in/Inport',[sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/in_1']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator/in_1']],...
		'position',[35,15,55,35])
add_line([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],[330,40;365,40])
add_line([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],[340,40;340,90;265,90])
add_line([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],[80,50;80,35;105,35])
add_line([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],[60,25;105,25])
add_line([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],[220,40;230,40])
add_line([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],[155,35;190,35])
add_line([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],[205,90;180,90;190,45])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],...
		'Mask Display','Mod\nint',...
		'Mask Type','Module Integrator')
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],...
		'Mask Dialogue','Module the given number when state exceed limit|Module bound:|Initial value:',...
		'Mask Translate','init=@2; modu=@1;')
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],...
		'Mask Help','The absolute value of this integrator will not exceed the specified module bound. The state value is set to be zero when the module bound is reached. This block can only be used for scale value calculation.')
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],...
		'Mask Entries','1\/0\/')


%     Finished composite block ['Voltage-controlled',13,'oscillator/Module',13,'Integrator'].

set_param([sys,'/',['Voltage-controlled',13,'oscillator/Module',13,'Integrator']],...
		'position',[210,24,265,56])

add_block('built-in/Sum',[sys,'/',['Voltage-controlled',13,'oscillator/Sum']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Sum']],...
		'position',[165,30,185,50])

add_block('built-in/Constant',[sys,'/',['Voltage-controlled',13,'oscillator/Carrier',13,'frequency']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Carrier',13,'frequency']],...
		'Value','Fc',...
		'position',[95,85,115,105])

add_block('built-in/Inport',[sys,'/',['Voltage-controlled',13,'oscillator/in_1']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/in_1']],...
		'position',[35,25,55,45])

add_block('built-in/Gain',[sys,'/',['Voltage-controlled',13,'oscillator/Sensitivity']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/Sensitivity']],...
		'Gain','Kc',...
		'position',[80,21,120,49])

add_block('built-in/Outport',[sys,'/',['Voltage-controlled',13,'oscillator/out_1']])
set_param([sys,'/',['Voltage-controlled',13,'oscillator/out_1']],...
		'position',[425,30,445,50])
add_line([sys,'/',['Voltage-controlled',13,'oscillator']],[60,35;75,35])
add_line([sys,'/',['Voltage-controlled',13,'oscillator']],[125,35;160,35])
add_line([sys,'/',['Voltage-controlled',13,'oscillator']],[120,95;140,95;140,45;160,45])
add_line([sys,'/',['Voltage-controlled',13,'oscillator']],[190,40;205,40])
add_line([sys,'/',['Voltage-controlled',13,'oscillator']],[270,40;280,40])
add_line([sys,'/',['Voltage-controlled',13,'oscillator']],[415,40;420,40])
set_param([sys,'/',['Voltage-controlled',13,'oscillator']],...
		'Mask Display','VCO',...
		'Mask Type','Voltage-controlled oscillator')
set_param([sys,'/',['Voltage-controlled',13,'oscillator']],...
		'Mask Dialogue','The frequency of the output signal\nchanges with the input signal.|Output amplitude:|Oscillation frequency (Hz):|Input sensitivity:|Initial phase (rad):')
set_param([sys,'/',['Voltage-controlled',13,'oscillator']],...
		'Mask Translate','Ac=@1;Fc=@2;Kc=@3;Ph=@4;pi2=2*pi;')
set_param([sys,'/',['Voltage-controlled',13,'oscillator']],...
		'Mask Help','This block causes the frequency of the sinusoidal oscillation signal to change with the input signal voltage. The input sensitivity is the preamplifier added to the input signal.')
set_param([sys,'/',['Voltage-controlled',13,'oscillator']],...
		'Mask Entries','1\/10\/1\/0\/')


%     Finished composite block ['Voltage-controlled',13,'oscillator'].

set_param([sys,'/',['Voltage-controlled',13,'oscillator']],...
		'position',[175,118,255,162])


%     Subsystem  ['Discrete-time',13,'VCO'].

new_system([sys,'/',['Discrete-time',13,'VCO']])
set_param([sys,'/',['Discrete-time',13,'VCO']],'Location',[53,560,655,675])

add_block('built-in/Fcn',[sys,'/',['Discrete-time',13,'VCO/module1']])
set_param([sys,'/',['Discrete-time',13,'VCO/module1']],...
		'Expr','rem(u[1],pi2)',...
		'position',[220,29,310,51])

add_block('built-in/Sum',[sys,'/',['Discrete-time',13,'VCO/Sum1']])
set_param([sys,'/',['Discrete-time',13,'VCO/Sum1']],...
		'inputs','+++',...
		'position',[175,22,195,58])

add_block('built-in/Constant',[sys,'/',['Discrete-time',13,'VCO/Phase1']])
set_param([sys,'/',['Discrete-time',13,'VCO/Phase1']],...
		'Value','Fc',...
		'position',[80,65,100,85])

add_block('built-in/Unit Delay',[sys,'/',['Discrete-time',13,'VCO/Unit Delay1']])
set_param([sys,'/',['Discrete-time',13,'VCO/Unit Delay1']],...
		'Sample time','ts',...
		'position',[330,30,380,50])

add_block('built-in/Gain',[sys,'/',['Discrete-time',13,'VCO/Sensitivity']])
set_param([sys,'/',['Discrete-time',13,'VCO/Sensitivity']],...
		'Gain','Kc',...
		'position',[75,15,125,45])

add_block('built-in/Inport',[sys,'/',['Discrete-time',13,'VCO/in_1']])
set_param([sys,'/',['Discrete-time',13,'VCO/in_1']],...
		'position',[20,20,40,40])

add_block('built-in/Fcn',[sys,'/',['Discrete-time',13,'VCO/sin']])
set_param([sys,'/',['Discrete-time',13,'VCO/sin']],...
		'Expr','Ac*sin(u[1]+Ph)',...
		'position',[415,28,530,52])

add_block('built-in/Outport',[sys,'/',['Discrete-time',13,'VCO/out_1']])
set_param([sys,'/',['Discrete-time',13,'VCO/out_1']],...
		'position',[555,30,575,50])
add_line([sys,'/',['Discrete-time',13,'VCO']],[200,40;215,40])
add_line([sys,'/',['Discrete-time',13,'VCO']],[315,40;325,40])
add_line([sys,'/',['Discrete-time',13,'VCO']],[385,40;410,40])
add_line([sys,'/',['Discrete-time',13,'VCO']],[45,30;70,30])
add_line([sys,'/',['Discrete-time',13,'VCO']],[130,30;170,30])
add_line([sys,'/',['Discrete-time',13,'VCO']],[535,40;550,40])
add_line([sys,'/',['Discrete-time',13,'VCO']],[105,75;150,75;150,40;170,40])
add_line([sys,'/',['Discrete-time',13,'VCO']],[385,40;395,40;395,80;155,80;155,50;170,50])
set_param([sys,'/',['Discrete-time',13,'VCO']],...
		'Mask Display','Discrete\nVCO',...
		'Mask Type','Voltage-controlled oscillator')
set_param([sys,'/',['Discrete-time',13,'VCO']],...
		'Mask Dialogue','The frequency of the output signal\nchanges with the input signal.|Output amplitude:|Oscillation frequency (Hz):|Input sensitivity:|Initial phase (rad):|Sample time (sec):')
set_param([sys,'/',['Discrete-time',13,'VCO']],...
		'Mask Translate','Ac=@1;Fc=@2;Kc=@3;Ph=@4;pi2=2*pi;ts=@5;Kc=Kc*pi2*ts(1);Fc=Fc*pi2;')
set_param([sys,'/',['Discrete-time',13,'VCO']],...
		'Mask Help','This block causes the frequency of the sinusoidal oscillation signal to change with the input signal voltage. The input sensitivity is the preamplifier added to the input signal. This block uses a discrete-time integrator.')
set_param([sys,'/',['Discrete-time',13,'VCO']],...
		'Mask Entries','1\/10\/1\/0\/.01\/')


%     Finished composite block ['Discrete-time',13,'VCO'].

set_param([sys,'/',['Discrete-time',13,'VCO']],...
		'position',[175,43,255,87])


%     Subsystem  ['Vector',13,'redistributor'].

new_system([sys,'/',['Vector',13,'redistributor']])
set_param([sys,'/',['Vector',13,'redistributor']],'Location',[175,552,335,697])
set_param([sys,'/',['Vector',13,'redistributor']],...
		'Mask Display','Vector\nre-arrange\ndemo',...
		'Mask Dialogue','eval(''tstdist'')')


%     Finished composite block ['Vector',13,'redistributor'].

set_param([sys,'/',['Vector',13,'redistributor']],...
		'BackGround',7,...
		'hide name',0,...
		'position',[175,568,255,612])


%     Subsystem  ['Register-shift',13,'demo'].

new_system([sys,'/',['Register-shift',13,'demo']])
set_param([sys,'/',['Register-shift',13,'demo']],'Location',[175,552,335,697])
set_param([sys,'/',['Register-shift',13,'demo']],...
		'Mask Display','Register\nshift\ndemo',...
		'Mask Dialogue','eval(''testregi'')')


%     Finished composite block ['Register-shift',13,'demo'].

set_param([sys,'/',['Register-shift',13,'demo']],...
		'BackGround',7,...
		'hide name',0,...
		'position',[175,493,255,537])


%     Subsystem  ['Envelope',13,'detector'].

new_system([sys,'/',['Envelope',13,'detector']])