How to read multiple .wav files and plot them as separate signals?

I would like to read from 10 files which they contain 10 wav files in each, so approximately 100wav files in total. I am trying to read them one by one and then apply some filttering and store the result in a new location but it should have the same name files and wav names as it was in the begging.

so practically take the voices apply some filterring and store them in a different location but in the same way same file names and wav.names audio signal but filltered. I do not care about the filltering I am only affter the read and write.

for example:

file 1:

has inside 10 wav files audio signal, eg1.wav, kle.wav.....lp.wav ( they do not have the same name or similar)

file 2:

has inside 10 wav files audio signal, kx1.wav, kle.wav.....lp.wav ( they do not have the same name or similar)

.

.

file 10

has inside 10 wav files audio signal, eg1.wav, kle.wav.....lp.wav ( they do not have the same name or similar)

I am trying to use the below code:

names = {'Voice1.wav', 'Voice2.wav', 'Voice3.wav', 'Voice4.wav'};

wave = cell(size(names));

fs = cell(size(names));

subplot_cols = 3;

subplot_rows = ceil(numel(names)/subplot_cols);

for i=1:numel(names)

[wave{i},fs{i}]=audioread('sample.wav');

t = linspace(0, (numel(wave{i})-1)/fs{i}, numel(wave{i}));

subplot(subplot_rows,subplot_cols,i)

plot(t, wave);

title(['File: ' names{i}]);

end

but it shows me an error

Error in Assigment (line 60)

plot(t,wave);

Many thanks in advance.

https://uk.mathworks.com/matlabcentral/answers/516853-how-can-i-read-multiple-wav-files-and-plot-them-as-separate-signals#comment_1034872

Answer 1

[Ameer Hamza]

Check this code

files = dir('file*');
f = figure();
destination_folder = ''; % put location of destimation folder

for i = 1:numel(files)
    sub_files = dir([files(i).name '/*.wav']);
    mkdir(destination_folder, files(i).name);
    for j = 1:numel(sub_files)
        nexttile();
        [y, Fs] = audioread(sub_files(j).name);
        Ts = 1/Fs;
        n = numel(y);
        t = (0:1:n-1)*Ts;
        plot(t, y);
        title(sprintf('%s %s', files(i).name, sub_files(j).name));
        
        % process the signal
        
        new_filename = fullfile(destination_folder, files(i).name, sub_files(j).name);
        audiowrite(new_filename, y, Fs);
    end
end

[GreyHunter]

It seems that it never goes into the first for loop -> for i = 1:numel(files)

in additon, the f = figure(); is empty it does not show anything see below:

Finally I did not mention that the audio does not have the same length.

[Ameer Hamza]

Does the current folder in MATLAB have folder named "file 1", "file 2", ...?

[GreyHunter]

I have changed the current name to "file" now, but it seems it does not work.

To be sure I typed the pwd and it show me the below:

'E:\*****\current test\Signal_processing\experement\Matlab\2020\file'

[GreyHunter]

I think if fixed the issue with the location and now it shows me that error message:

Warning: Directory already exists.

> In Assigment (line 66)

line of code 66 is this -> mkdir(destination_folder, files(i).name);

I can see is creatting the files but it does not copiying the audio signals into the files.

in addition, still does not entering the for loop...

and the figure is stil empty.

[Ameer Hamza]

Delete any folder inside destination_folder and then try the code again. mkdir gives error because the destination_folder forlder already have folders names file 1, file 2, ...

[GreyHunter]

Yes, I realised that earlier this morning. The problem now is that it does not read all the wav audio signals and also, it does not entering the second for loop.

for j = 1:numel(sub_files)

nexttile();

[y, Fs] = audioread(sub_files(j).name);

Ts = 1/Fs;

n = numel(y);

t = (0:1:n-1)*Ts;

plot(t, y);

title(sprintf('%s %s', files(i).name, sub_files(j).name));

The sub_files are equal to this: (which sounds about right)

val =

name

folder

date

bytes

isdir

datenum

J =[]

[GreyHunter]

I have tried to amend the code you provided as per below:

d = dir('E:\*****\current test\Signal_processing\experement\Matlab\2020\file');

subdirList = fullfile({d.folder}', {d.name}');

subdirList(~[d.isdir]) = []; %remove non-directories

%Loop through subdirectories

y = cell(1, 100*10); %100 files x 10 folders

c = 0; %This is just a counter

for i = length(subdirList)

filelist= dir(fullfile(subdirList{i}, '*.wav'));

% Loop through files

for j = 1:size(filelist,1)

nexttile()

c = c+1;

[y, Fs] = audioread(fullfile(filelist(j).folder, filelist(j).name));

Ts = 1/Fs;

n = numel(y);

t = (0:1:n-1)*Ts;

plot(t, y);

% title(sprintf('%s %s', subdirList(i).name, filelist(j).folder));

sound(y);

end

end

It seems it works I can read all the wav files but in the second for loop reads only the last 10 wav. audio signals and ignore the previous 90 wav audio signals which are in the 9 other files.

Answer 2

[GreyHunter]

Anyone who can advise I would appriaciate that, currently I have managed to read all the files from all the subfiles I want, then I am making some folder and files same as the initial ones and I would like to take the output of each signal which has been filtered and stored in the the new files which has been created but unfortunetely it does not work. It does not store all the files but only the last 10 from the 100 and in a different location. Please see below my code

files = dir('File');

destination_folder = 'XXXx';

for i = 1:numel(files)

sub_files = dir([files(i).name '/*.wav']);

mkdir(destination_folder, files(i).name);

end

wav_folder = dir('XXXXx');

subdirList = fullfile({wav_folder.folder}', {wav_folder.name}');

for i=1:length(subdirList)

filelist = dir(fullfile(subdirList{i}, '*.wav'));

for j=1:length(filelist)

acq_fn = fullfile(subdirList{i},filelist(j).name);

[p, name, ext] = fileparts(acq_fn);

[signal, Fs] = audioread(acq_fn);

Ts = 1/Fs;

n = numel(signal);

t = (0:1:n-1)*Ts;

% title(sprintf('%s %s', subdirList(i).name, filelist(j).folder));

%filtering the signals

% the output signal should be store in a specific folder and file.

file1=sprintf('file48000_%d.wav',i);

FOLDER_NAME = 'XXXXXX';

userpath(FOLDER_NAME);

filelist1 = dir(fullfile(subdirList{i}, '*.wav'));

audiowrite(file1,outSignal,Fs);

end

end