Audio denoising using wavelet thresholding technique. What does the error mean and how to rectify?

clc 
close all   
[file,path] = uigetfile('./Databases/*.wav', 'Select the speech files', 'MultiSelect', 'on');  
[ipsignal, Fs] = audioread([path,file]); 
ipsignal = ipsignal(1:length(ipsignal)/2); 
amp = 100; 
ipsignal = amp*ipsignal; 
N = length(ipsignal); 
sn = 10; 
ipsignalN  = awgn(ipsignal,sn);   
sound(ipsignalN,Fs); 
level = 3; 
fprintf('\tchoose Wavelet:\n\t1: daubechies-13\n\t2: Daubechies40\n\t3: Symlet-13\n\t4: Symlet-21\n\t'); 
wname = input('Enter you choice: '); 
if wname == 1     
    wt = 'db13'; 
elseif wname == 2     
    wt = 'db40'; 
elseif wname == 3     
    wt = 'sym13'; 
elseif wname == 4     
    wt = 'sym21'; 
end   
[LoD,HiD,LoR,HiR] = wfilters(wt); 
[C,L] = wavedec(ipsignalN,level,LoD,HiD); 
cA3 = appcoef(C,L,wt,level); 
[cD1,cD2,cD3] = detcoef(C,L,[1,2,3]); 
A3 = wrcoef('a',C,L,LoR,HiR,level); 
D1 = wrcoef('d',C,L,LoR,HiR,1); 
D2 = wrcoef('D',C,L,LoR,HiR,2); 
D3 = wrcoef('D',C,L,LoR,HiR,3);  
%step 2 - Thresholding 
fprintf('\n\tChoose Threshold Rule:\n\t1: Universal\n\t2: Minimax\n\t3: Level dependent threshold\n\t'); 
tr = input('Enter your choice: '); 
if tr == 1     
    D = [D1 D2 D3];     
    th = zeros(1,length(D));     
    Dth = zeros(1,length(D));     
    fprintf('\n\t choose threshold type:\n\t1: Soft\n\t2: Hard\n\t');
    sh = input('Enter you choice: ');     
    if sh == 1          
        sorh = 's';     
    else          
        sorh = 'h';     
    end     
    for g =1:length(D)         
        th(g) = sqrt(2*log(numel(D(g))));         
        Dth(g) = wthresh(D(g),sorh,th(g));     
    end     
    denoised = A3;     
    for i=1:length(Dth)      
        denoised = denoised+Dth(i);     
    end       
    customplot(ipsignal,ipsignalN,denoised);     
    sound(denoised,Fs); 
elseif tr == 2     
    tptr = 'minimaxi';     
    thr_D1 = thselect(D1,tptr);     
    thr_D2 = thselect(D2,tptr);     
    thr_D3 = thselect(D3,tptr);     
    fprintf('\n\t choose threshold type:\n\t1: Soft\n\t2: Hard\n\t');     
    sh = input('Enter you choice: ');     
    if sh == 1         
        sorh = 's';     
    else sh == 2         
        sorh = 'h';     
    end       
    %Threshold coefficient of details     
    tD1 = wthresh(D1,sorh,thr_D1);     
    tD2 = wthresh(D2,sorh,thr_D2);     
    tD3 = wthresh(D3,sorh,thr_D3);       
    %step 3: Compute Inverse DWT     
    denoised = A3 + tD1 + tD2 + tD3;       
    customplot(ipsignal,ipsignalN,denoised)     
    sound(denoised,Fs); 
else     
    D = [D1 D2 D3];     
    th = zeros(1,length(D));     
    Dth = zeros(1,length(D));     
    fprintf('\n\t choose threshold type:\n\t1: Soft\n\t2: Hard\n\t');     
    sh = input('Enter you choice: ');     
    if sh == 1          
        sorh = 's'; 
    else          
        sorh = 'h';     
    end     
    for g =1:length(D)        
        th(g) = sqrt(2*log(numel(D(g)))/pow2(i));         
        Dth(g) = wthresh(D(g),sorh,th(g));     
    end     
    denoised = A3;     
    for i=1:length(Dth)      
        denoised = denoised+Dth(i);     
    end          
    customplot(ipsignal,ipsignalN,denoised);     
    sound(denoised,Fs); 
end
function customplot(ipsignal,ipsignalN,denoised)     
    figure     
    subplot(3,1,1);     
    plot(ipsignal);     
    title('Original Speech Signal');
    xlabel('samples');
    ylabel('Amplitude');     
    subplot(3,1,2);     
    plot(ipsignalN);     
    title('Noisy Speech Signal');
    xlabel('Samples');
    ylabel('Amplitude');     
    subplot(3,1,3);     
    plot(denoised);ylim([-10 10]);     
    title('De-noised Speech Signal');
    xlabel('Samples');
    ylabel('Amplitude'); 
end 
 ERRORS 
 Index exceeds the number of array elements (0).

Error in matlab.ui.internal.dialog.FileChooser/updateFromDialog (line 215)
                        obj.PathName = filepaths{1};

Error in matlab.ui.internal.dialog.FileChooser/prepareDialog/localupdate (line 95)
                updateFromDialog(obj,updateDataObject(obj));
 

Answer 1

[Abhishek Kumar]

Hi Vartika, I tried execute you code with another input ".wav" on my machine and it worked just fine. The only reason you can be getting this error is the path of input file you are providing for your input ".wav" file. Please verify the input path you are providing in "uigetfile", do also mention which version of MATLAB you are using.