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spectral smoothing

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spectral smoothing

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07 Feb 2014 (Updated )

This exercise smooths the log magnitude spectrum of a frame of voiced speech using liftering.

Callbacks_spectral_smoothing_GUI25(f,C,start_path)
function Callbacks_spectral_smoothing_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);
case 13
button13=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',@button13Callback);
end
end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%USER CODE FOR THE VARIABLES AND CALLBACKS
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Initialize Variables
    curr_file=1;
    fs=8000;
    directory_name='abcd';
    wav_file_names='abce';
    fin_path='filename';
    fname='output';
    nsamp=1;
    ss=1;
    istart=1;
    Lm=9;
    L=128;
    Rm=10;
    R=80;
    iwin_STFT=1;
    iwin_LPC=1;
    nfft=2048;
    win=hamming(640);
    p=12;
    Lc=20;
    Lcm=2;

% Name the GUI
    set(f,'Name','spectral_smoothing');

% CALLBACKS
 %Callback for button1 -- Get Speech Files Directory
 function button1Callback(h,eventdata)
     directory_name=uigetdir(start_path,'dialog_title');
%      if isempty(getpref('SpeechApps'))
%          url = sprintf('%s%s%s',...
%              'http://www.mathworks.com/matlabcentral/fileexchange/',...
%              '42911-speech-and-audio-files-for-speech-processing-excercises',...
%              '?download=true');
%          [saveloc,~,~] = fileparts(pwd); %save to one level up from current folder
%          % Create a waitbar during download
%          h = waitbar(0.35,'This may take several minutes...',...
%              'Name','Downloading Speech Files...');
%          % Download the zipped file
%          [filestr,status] = urlwrite(url,[saveloc filesep 'speech_files.zip'],...
%              'Timeout',10);
%          if status
%              delete(h);
%              hh1= helpdlg('Downloaded. Select a location to UNZIP the speech files.');
%              uiwait(hh1);
%              unziploc = uigetdir(saveloc,'Select a location to unzip the speech files');
%              h2 = waitbar(0.2,'This may take a minute...',...
%                  'Name','Unzipping the Speech Files to Location Selected...');
%              unzip(filestr,unziploc);
%              delete(h2)
%              addpref('SpeechApps','path',unziploc);
%              hh2= helpdlg('Ready. Select the speech_files folder in the next window');
%              uiwait(hh2);
%          else
%              warndlg('No Internet Connection to MATLAB Central!');
%          end
%         
%      else
%      end
%      directory_name=uigetdir(getpref('SpeechApps','path'));
     A=strvcat(strcat((directory_name),'\*.wav'));
     struct_filenames=dir(A);
     wav_file_names={struct_filenames.name};
     set(button2,'String',wav_file_names);
     set(button2,'val',1);
     
% 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,'\',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);
    
% read in filename (fname) from cell array
    fname=wav_file_names{indexOfDrpDwnMenu};
end

% Callback for button9 -- Play Speech File
    function button9Callback(h,eventdata)
        soundsc(curr_file,fs);
    end

% Callback for button4 -- Lm: analysis frame length in msec
 function button4Callback(h,eventdata)
    Lm=str2num(get(button4,'string'));
    if ~((Lm >= 1 && Lm <= 100))
        waitfor(errordlg('Lm must be a positive number between 1 and 100'))
        return;
     end
    L=round(Lm*fs/1000);
 end

% Callback for button10 -- Rm: analysis frame shift in msec
 function button10Callback(h,eventdata)
    Rm=str2num(get(button10,'string')); 
    if ~((Rm >= 1 && Rm <= 100))
        waitfor(errordlg('Rm must be a positive number between 1 and 100'))
        return;
     end
    R=round(Rm*fs/1000);
 end

% Callback for button3 -- p: lpc system order
 function button3Callback(h,eventdata)
     p=str2num(get(button3,'string'));
     if ~((p >= 4 && p <= 32))
        waitfor(errordlg('p must be a positive integer between 4 and 32'))
        return;
     end
     p=round(p);
     set(button3,'string',num2str(p));
 end

% Callback for button6 -- Lc: highest frequency for filter 
 function button6Callback(h,eventdata)
     Lcm=str2num(get(button6,'string')); 
     if ~((Lcm >= 2 && Lcm <= 16))
        waitfor(errordlg('Lcm must be a positive number between 2 and 16'))
        return;
     end
     Lc=round(Lcm*fs/1000);
 end

% Callback for button11 -- iwin-STFT: STFT window type (1:Hamming, 2:Rectangular) 
 function button11Callback(h,eventdata)
     iwin_STFT=get(button11,'val');    
 end

% Callback for button5 -- iwin_LPC: LPC/cepstrum window type (1:Hamming, 2:Rectangular) 
 function button5Callback(h,eventdata)
     iwin_LPC=get(button5,'val');    
 end

% Callback for button7 -- get starting sample for current frame 
 function button7Callback(h,eventdata)
     
% check editable buttons for changes
    button4Callback(h,eventdata);
    button11Callback(h,eventdata);
    
    istart=1;
    ss=1;
    
% save speech file in array x
    x=curr_file;
    
% plot entire speech file in graphics Panel 2; use graphical cursor to
% determine the region of the analysis frame
    ss=plot_speech_cursor(x,ss,curr_file,istart,graphicPanel2);

% plot expanded region of speech file in graphics Panel 3;
% determine starting sample of analysis frame using second graphical 
% cursor and plot window-weighted analysis frame in graphics Panel 2
    plot_frame(curr_file,ss,L,fs,iwin_STFT,graphicPanel2);
 end

% Callback for button12 -- Run Current Frame
    function button12Callback(h,eventdata);
    button5Callback(h,eventdata);
    button11Callback(h,eventdata);
               
% call routine to compute STFT log magnitude spectrum, liftered and inverse
% transformed real cepstrum log magnitude spectrum, lpc analysis log
% magnitude spectrum
    [X1s,X2s,X3s,L]=compute_spectra(curr_file,fs,ss,Lm,p,iwin_STFT,iwin_LPC,Lc,nfft);
    
% plot all three log magnitude spectra on common graphics Panel 1
    freq=0:fs/nfft:fs/2;
    s1=sprintf('file: %s, ss: %d, LPC params: L: %d,',fname,ss,L);
    s2=sprintf(' p: %d, cepstral: Lc: %d',p,Lc);
    stitle=strcat(s1,s2);

% clear graphics Panel 1
    reset(graphicPanel1);axes(graphicPanel1);cla;
    
% plot STFT log magnitude spectrum on graphics Panel 1;
% overlay log magnitude spectrums from lpc and cepstral analysis on
% graphics Panel 1
    plot(freq,X2s,'r','LineWidth',1),xlabel('Frequency in Hz'),...
        ylabel('Log Magnitude (dB)'),...
        hold on;
    plot(freq,X1s,'b','LineWidth',2);
    plot(freq,X3s,'g','LineWidth',2),...
        legend('STFT','LPC spectrum','homomorphic spectrum');
        axis tight;grid on;
    
% load textBox1 with filename and signal processing parameters
    stitle1=strcat('Spectral Smoothing -- ',stitle);
    set(titleBox1,'String',stitle1);
	set(titleBox1,'FontSize',20);
    end

% Callback for button13 -- Run Next Frame
    function button13Callback(h,eventdata);
        ss=ss+R;
        button12Callback(h,eventdata);
    end

% Callback for button8 -- close GUI
 function button8Callback(h,eventdata)
     close(gcf);
 end
end

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