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

Hello,

I am pretty new to Matlab, and am currently struggling with a task. So basically, I need to read data from 2 .wav files and create a graph of these ?1(?) and ?2(?) respectively audio signals with time domains on the x-axis, then make a sum s3(n) of those signals, and display it alongside the initial 2. Any help would be appreciated.

[Peng Li]

You could read them separately using audioread function. It just needs the directory of each wave file and returns the signal as the first outcome, and sampling frequency as the second.

[prodeje]

So for example:

[wave1,fs1]=audioread('Voice1.wav');

[wave2,fs2]=audioread('Voice2.wav');

And then how should I plot them as separate signals in a graph? Thanks.

Answer 1

[Ameer Hamza]

For the case of two signals, try this

[wave1,fs1]=audioread('Voice1.wav'); 
[wave2,fs2]=audioread('Voice2.wav');

t1 = linspace(0, (numel(wave1)-1)/fs1, numel(wave1));
t2 = linspace(0, (numel(wave2)-1)/fs2, numel(wave2));

subplot(2,1,1)
plot(t1, wave1);
subplot(2,1,2)
plot(t1, wave1);

For multiple files, use this

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(t1, wave1);
    title(['File: ' names{i}]);
end

If the names of all files follow a similar pattern, then try something like this

files = dir('Voice*.wav'); % get names of all files of pattern Voice1.wav, Voice2.wav, Voice3.wav, ...
names = {files.name};

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(t1, wave1);
    title(['File: ' names{i}]);
end

[GreyHunter]

In the case we have around 10 files and in each file we have 10 wav, files. Can we read them in a easier way?

In addition, once we read them how we can write them exactly in the same way in a diferrent location? I want to filterring them and then transerred them in another location.

[Ameer Hamza]

Can you write a new question with details of how your files are structued? Paste the link in the comment. If possible, I will try to answer.

[GreyHunter]

Thanks very much. I have raised a new question.