Code covered by the BSD License  

Highlights from
Analog Filter Design Toolbox

image thumbnail

Analog Filter Design Toolbox

by

 

27 Dec 2005 (Updated )

GUI to design and simulate active (opamp) LP and HP Bessel, Butter, Cheby, and Elliptic filters.

GuiListFrequencyResponse(varargin)
function varargout = GuiListFrequencyResponse(varargin)
% GUILISTFREQUENCYRESPONSE M-file for GuiListFrequencyResponse.fig
%      GUILISTFREQUENCYRESPONSE, by itself, creates a new GUILISTFREQUENCYRESPONSE or raises the existing
%      singleton*.
%
%      H = GUILISTFREQUENCYRESPONSE returns the handle to a new GUILISTFREQUENCYRESPONSE or the handle to
%      the existing singleton*.
%
%      GUILISTFREQUENCYRESPONSE('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in GUILISTFREQUENCYRESPONSE.M with the given input arguments.
%
%      GUILISTFREQUENCYRESPONSE('Property','Value',...) creates a new GUILISTFREQUENCYRESPONSE or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before GuiListFrequencyResponse_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to GuiListFrequencyResponse_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help GuiListFrequencyResponse

% Last Modified by GUIDE v2.5 27-Dec-2003 07:09:37

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @GuiListFrequencyResponse_OpeningFcn, ...
                   'gui_OutputFcn',  @GuiListFrequencyResponse_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin & isstr(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

% --- Executes just before GuiListFrequencyResponse is made visible.
function GuiListFrequencyResponse_OpeningFcn(hObject, eventdata, handles, varargin)
% hObject    handle to figure
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to GuiListFrequencyResponse (see VARARGIN)
handles.output = hObject;   % Choose default command line output for GuiListFrequencyResponse

global strFilterObject

% Load data
if isempty(strFilterObject)
   temp=load('matlab');
   disp([mfilename ' called in debug mode using matlab.mat datafile'])
   strFilterObject = temp.strFilterObject;
end
strFilterObject=Utility_zpk(strFilterObject); % find poles, zeros
set(handles.uiFigure,'Name',strFilterObject.sTitle)

% initialize the ui widgets to the cutoff frequency
if strFilterObject.fFc >= 1e6
    set(handles.uipmF1,'Value',4)
    set(handles.uitxF1, 'String', num2str(strFilterObject.fFc/1e6))
    set(handles.uipmF2,'Value',4)
    set(handles.uitxF2, 'String', num2str(strFilterObject.fFc/1e6))
elseif strFilterObject.fFc >= 1000
    set(handles.uipmF1,'Value',3)
    set(handles.uitxF1, 'String', num2str(strFilterObject.fFc/1e3))
    set(handles.uipmF2,'Value',3)
    set(handles.uitxF2, 'String', num2str(strFilterObject.fFc/1e3))
elseif strFilterObject.fFc >= 1
    set(handles.uipmF1,'Value',2)
    set(handles.uitxF1, 'String', num2str(strFilterObject.fFc))
    set(handles.uipmF2,'Value',2)
    set(handles.uitxF2, 'String', num2str(strFilterObject.fFc))
elseif strFilterObject > 0
    set(handles.uipmF1,'Value',1)
    set(handles.uitxF1, 'String', num2str(strFilterObject.fFc*1000))
    set(handles.uipmF2,'Value',1)
    set(handles.uitxF2, 'String', num2str(strFilterObject.fFc*1000))
else
    error('Fc in strFilterObject is negative')
end
set(handles.uitxStatus,'String','Find the filter response at up to two different frequencies');

% Update handles structure
guidata(hObject, handles);
Recalculate1(handles)
Recalculate2(handles)


% --- Outputs from this function are returned to the command line.
function varargout = GuiListFrequencyResponse_OutputFcn(hObject, eventdata, handles)
varargout{1} = handles.output;


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                        UI Widget Handlers
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function uitxF1_Callback(hObject, eventdata, handles)
global strFilterObject
num=str2double(get(hObject,'String'));
if isnan(num)
    errordlg('Enter a numeric freqnency at which to examine the filter''s response','Error')
    set(hObject,'String',sprintf('%g',strFilterObject.fFc))
elseif num < 0
    errordlg('The frequency must be postive','Error')
    set(hObject,'String',sprintf('%g',strFilterObject.fFc))
else
    set(hObject,'String',sprintf('%g',num))
end
Recalculate1(handles)

function uitxF2_Callback(hObject, eventdata, handles)
global strFilterObject
num=str2double(get(hObject,'String'));
if isnan(num)
    errordlg('Enter a numeric freqnency at which to examine the filter''s response','Error')
    set(hObject,'String',sprintf('%g',strFilterObject.fFc))
elseif num < 0
    errordlg('The frequency must be postive','Error')
    set(hObject,'String',sprintf('%g',strFilterObject.fFc))
else
    set(hObject,'String',sprintf('%g',num))
end
Recalculate2(handles)

function uipmF1_Callback(hObject, eventdata, handles)
Recalculate1(handles)

function uipmF2_Callback(hObject, eventdata, handles)
Recalculate2(handles)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                        Helper functions
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function Recalculate1(handles)
global strFilterObject
% get the data
z = strFilterObject.vZeros; 
p = strFilterObject.vPoles; 
k = strFilterObject.fK; 
f = str2num(get(handles.uitxF1,'String'))*10^((get(handles.uipmF1,'Value')-2)*3);
% do the calculations
w=f*2*pi;
H = k*prod(j*w-z)/prod(j*w-p);
magH = abs(H);
dBH  = 20*log10(magH);
radH = angle(H);
degH = radH*180/pi;
% post the data
set(handles.uitxF1Mag,'String',sprintf('%g',magH))
set(handles.uitxF1MagDb,'String',sprintf('%g',dBH))
set(handles.uitxF1AngleDeg,'String',sprintf('%g',degH))
set(handles.uitxF1AngleRad,'String',sprintf('%g',radH))


function Recalculate2(handles)
global strFilterObject
% get the data
z = strFilterObject.vZeros; 
p = strFilterObject.vPoles; 
k = strFilterObject.fK; 
f = str2num(get(handles.uitxF2,'String'))*10^((get(handles.uipmF2,'Value')-2)*3);
% do the calculations
w=f*2*pi;
H = k*prod(j*w-z)/prod(j*w-p);
magH = abs(H);
dBH  = 20*log10(magH);
radH = angle(H);
degH = radH*180/pi;
% post the data
set(handles.uitxF2Mag,'String',sprintf('%g',magH))
set(handles.uitxF2MagDb,'String',sprintf('%g',dBH))
set(handles.uitxF2AngleDeg,'String',sprintf('%g',degH))
set(handles.uitxF2AngleRad,'String',sprintf('%g',radH))

Contact us