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Cepstrum Aliasing

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Cepstrum Aliasing

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30 Jan 2014 (Updated )

Estimates the level of aliasing when finite size FFTs for the computation are used

Callbacks_cepstrum_aliasing_GUI25(f,C,start_path)
function Callbacks_cepstrum_aliasing_GUI25(f,C,start_path)

%SENSE COMPUTER AND SET FILE DELIMITER
switch(computer)				
    case 'MACI64',		char= '/';
    case 'GLNX86',  char='/';
    case 'PCWIN',	char= '\';
    case 'PCWIN64', char='\';
    case 'GLNXA64', char='/';
end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
x=C{1,1};
y=C{1,2};
a=C{1,3};
b=C{1,4};
u=C{1,5};
v=C{1,6};
m=C{1,7};
n=C{1,8};
lengthbutton=C{1,9};
widthbutton=C{1,10};
enterType=C{1,11};
enterString=C{1,12};
enterLabel=C{1,13};
noPanels=C{1,14};
noGraphicPanels=C{1,15};
noButtons=C{1,16};
labelDist=C{1,17};%distance that the label is below the button
noTitles=C{1,18};
buttonTextSize=C{1,19};
labelTextSize=C{1,20};
textboxFont=C{1,21};
textboxString=C{1,22};
textboxWeight=C{1,23};
textboxAngle=C{1,24};
labelHeight=C{1,25};
fileName=C{1,26};
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%PANELS
for j=0:noPanels-1
uipanel('Parent',f,...
'Units','Normalized',...
'Position',[x(1+4*j) y(1+4*j) x(2+4*j)-x(1+4*j) y(3+4*j)-y(2+4*j)]);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%GRAPHIC PANELS
for i=0:noGraphicPanels-1
switch (i+1)
case 1
graphicPanel1 = axes('parent',f,...
'Units','Normalized',...
'Position',[a(1+4*i) b(1+4*i) a(2+4*i)-a(1+4*i) b(3+4*i)-b(2+4*i)],...
'GridLineStyle','--');
case 2
graphicPanel2 = axes('parent',f,...
'Units','Normalized',...
'Position',[a(1+4*i) b(1+4*i) a(2+4*i)-a(1+4*i) b(3+4*i)-b(2+4*i)],...
'GridLineStyle','--');
case 3
graphicPanel3 = axes('parent',f,...
'Units','Normalized',...
'Position',[a(1+4*i) b(1+4*i) a(2+4*i)-a(1+4*i) b(3+4*i)-b(2+4*i)],...
'GridLineStyle','--');
end
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%TITLE BOXES
for k=0:noTitles-1
switch (k+1)
case 1
titleBox1 = uicontrol('parent',f,...
'Units','Normalized',...
'Position',[u(1+4*k) v(1+4*k) u(2+4*k)-u(1+4*k) v(3+4*k)-v(2+4*k)],...
'Style','text',...
'FontSize',textboxFont{k+1},...
'String',textboxString(k+1),...
'FontWeight',textboxWeight{k+1},...
'FontAngle',textboxAngle{k+1});
end
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%BUTTONS
for i=0:(noButtons-1)
enterColor='w';
if strcmp(enterType{i+1},'pushbutton')==1 ||strcmp(enterType{i+1},'text')==1
enterColor='default';
end
if (strcmp(enterLabel{1,(i+1)},'')==0 &&...
        strcmp(enterLabel{1,(i+1)},'...')==0) %i.e. there is a label
%creating a label for some buttons
uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i)-labelDist-labelHeight(i+1) ...
(m(2+2*i)-m(1+2*i)) labelHeight(i+1)],...
'Style','text',...
'String',enterLabel{i+1},...
'FontSize', labelTextSize(i+1),...
'HorizontalAlignment','center');
end
switch (i+1)
case 1
button1=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button1Callback);
case 2
button2=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button2Callback);
case 3
button3=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button3Callback);
case 4
button4=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button4Callback);
case 5
button5=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button5Callback);
case 6
button6=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button6Callback);
case 7
button7=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button7Callback);
case 8
button8=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button8Callback);
case 9
button9=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button9Callback);
case 10
button10=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button10Callback);
case 11
button11=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button11Callback);
case 12
button12=uicontrol('Parent',f,...
'Units','Normalized',...
'Position',[m(1+2*i) n(1+2*i) (m(2+2*i)-m(1+2*i)) (n(2+2*i)-n(1+2*i))],...
'Style',enterType{i+1},...
'String',enterString{i+1},...
'FontSize', buttonTextSize(1+i),...
'BackgroundColor',enterColor,...
'HorizontalAlignment','center',...
'Callback',@button12Callback);
end
end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%USER CODE FOR THE VARIABLES AND CALLBACKS
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Initialize Variables
    curr_file=[];
    fs=1;
    directory_name='abcd';
    wav_file_names='abce';
    fin_path='filename';
    fname='output';
    nsamp=1;
    ss=1;
    istart=1;
    Lm=40;
    iwindow=1;
    nffti=8192;
    ceplm=30;
    cepl=200;
    nfft=8192;
    nffti=500;
    L=640;
    R=160;
    win=[];
    x=[];
% Name the GUI
    set(f,'Name','real_cepstrum_aliasing_speech');

% CALLBACKS
% Callback for button1 -- Get Speech Files Directory
 function button1Callback(h,eventdata)
     directory_name=uigetdir(start_path,'dialog_title');
     A=strvcat(strcat((directory_name),[char,'*.wav']));
     struct_filenames=dir(A);
     wav_file_names={struct_filenames.name};
     set(button2,'String',wav_file_names);
     
% once the popupmenu/drop down menu is created, by default, the first
% selection from the popupmenu/drop down menu id not called
    indexOfDrpDwnMenu=1;
    
% by default first option from the popupmenu/dropdown menu will be loaded
    [curr_file,fs]=loadSelection(directory_name,wav_file_names,indexOfDrpDwnMenu);
 end

% Callback for button2 -- Choose speech file for play and plot
 function button2Callback(h,eventdata)
     indexOfDrpDwnMenu=get(button2,'val');
     [curr_file,fs]=loadSelection(directory_name,wav_file_names,indexOfDrpDwnMenu);
 end

%*************************************************************************
% function -- load selection from designated directory and file
%
function [curr_file,fs]=loadSelection(directory_name,wav_file_names,...
    indexOfDrpDwnMenu);
%
% read in speech/audio file
% fin_path is the complete path of the .wav file that is selected
    fin_path=strcat(directory_name,char,strvcat(wav_file_names(indexOfDrpDwnMenu)));
    
% clear speech/audio file
    clear curr_file;
    
% read in speech/audio signal into curr_file; sampling rate is fs 
    [curr_file,fs]=wavread(fin_path);
    
% create title information with file, sampling rate, number of samples
    fname=wav_file_names(indexOfDrpDwnMenu);
    FS=num2str(fs);
    nsamp=num2str(length(curr_file));
    file_info_string=strcat('  file: ',fname,', fs: ',FS,' Hz, nsamp:',nsamp);
    
% load filename (fname) from cell array
    fname=wav_file_names{indexOfDrpDwnMenu};
end

% Callback for button11 -- Play Speech File
    function button11Callback(h,eventdata)
        soundsc(curr_file,fs);
    end

% Callback for button3 -- Lm: frame duration in msec
 function button3Callback(h,eventdata)
    Lm=str2num(get(button3,'string'));
    if (Lm < 1 || Lm > 100)
        waitfor(errordlg('The value of frame duration must be between 1 and 100'));
        return;
    end
    L=round(Lm*fs/1000);
 end

% Callback for button4 -- Rm: frame shift in msec
 function button4Callback(h,eventdata)
    Rm=str2num(get(button4,'string'));
    if (Rm < 1 || Rm > 100)
        waitfor(errordlg('The value of frame shift must be between 1 and 100'));
        return;
    end
    R=round(Rm*fs/1000);
 end

% Callback for button5 -- iwindow: window type (1:Hamming, 2:Rectangular)
 function button5Callback(h,eventdata)
     iwindow=get(button5,'val');
     win=ones(1,L)';
     if (iwindow == 1) win=hamming(L);
     end 
 end

% Callback for button6 -- nffti: initial value for fft computation
 function button6Callback(h,eventdata)
     nffti=str2num(get(button6,'string'));
     if (nffti ~= 512 && nffti ~= 1024)
        waitfor(errordlg('The initial value for fft must be equal to 512 or 1024'));
        return;
    end
 end

% Callback for button7 -- cepl: cepstral duration in samples
 function button7Callback(h,eventdata)
     ceplm=str2num(get(button7,'string'));
     if (ceplm < 20 || ceplm > 60)
        waitfor(errordlg('The value of cepstral length must be between 20 and 60'));
        return;
     end
     cepl=round(ceplm*fs/1000);
 end

% Callback for button8 -- choose current frame starting sample, ss
 function button8Callback(h,eventdata)
% check editable buttons for changes
    button3Callback(h,eventdata);  % Lm
    button4Callback(h,eventdata);  % Rm
    button5Callback(h,eventdata);  % window
    button6Callback(h,eventdata);  % nffti
    button7Callback(h,eventdata);  % ceplm
    istart=1;
    ss=1;
    x=curr_file;
    
% iteratively determine frame of speech for analysis; start with entire
% speech file and then home into a small region, and finally select the
% frame for analysis
    ss=plot_speech_cursor(x,ss,curr_file,istart,graphicPanel3,win,L,fs);
 end

% Callback for Button 12 -- run cepstral aliasing on current frame
    function button12Callback(h,eventdata)
        
% check editable buttons for changes
    button3Callback(h,eventdata);  % Lm
    button4Callback(h,eventdata);  % Rm
    button5Callback(h,eventdata);  % window
    button6Callback(h,eventdata);  % nffti
    button7Callback(h,eventdata);  % ceplm
    
% plot speech frame in graphics panel 3
    reset(graphicPanel3);
    axes(graphicPanel3);
    cla;
    plot(0:L-1,curr_file(ss:ss+L-1).*win(1:L),'b','LineWidth',2);
    xpp=['Time in Samples; fs=',num2str(fs),' samples/second'];
    xlabel(xpp);ylabel('Value');grid on, axis tight; legend('speech frame');
        
% clear graphics panels 1 and 2
    reset(graphicPanel2);
    axes(graphicPanel2);
    cla;
  
    reset(graphicPanel1);
    axes(graphicPanel1);
    cla;
       
% solve for cepstrum and aliasing error for range of nfft
    while (L > nffti) nffti=2*nffti;
    end
    set(button6,'string',num2str(nffti));
    [c1,cell_dif,ncount]=cepstral_aliasing_speech(curr_file,ss,win,fs,...
        L,nffti,cepl);

% determine aliasing of cepstrum based on difference with cepstrum computed
% using large fft size; plot results in graphics Panel 2 (computed using
% large fft size), and in graphics Panel 1 (difference in cepstrum based on
% using smaller fft sizes); titleBox1 used to display file name and signal
% processing parameters
    plot_cepstral_aliasing(graphicPanel2,graphicPanel1,titleBox1,...
        cepl,c1,fname,ss,nffti,cell_dif,ncount,L,R,fs);
 end

% Callback for button9 -- iterate run on next frame
 function button9Callback(h,eventdata)
     
% check editable buttons for changes
    button3Callback(h,eventdata);  % Lm
    button4Callback(h,eventdata);  % Rm
    button5Callback(h,eventdata);  % window
    button6Callback(h,eventdata);  % nffti
    button7Callback(h,eventdata);  % ceplm
    ss=ss+R;
    
    button12Callback(h,eventdata)       
 end

% Callback for button10 -- close GUI
 function button10Callback(h,eventdata)
     close(gcf);
 end
end

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