Read and analyse multiple .wav files

Hi,

I have 100 .wav files in the same folder which I would like to perform analysis on. I would like to read in the files one at a time, perform some simple analysis on them (e.g. calculate the mean) and then save the outputs in to a seperate file.

The essential issue seems to be importing the file and then saving each analysed output seperately. The steps I see it are to automate the following:

1. Import file 1.wav
2. Calculate the mean of file 1.wav
3. Save the mean of file .wav as meanfile1.mat
4. import file 2.wav
5. repeat steps 1-3 on file 2, saving as meanfile2.mat
6. And so on doing this for all the remaining .wav files

Please can anyone help with this?

Thank you!

Answer 1

[Prabhan Purwar]

Hi,

Following code illustrates the saving and loading of multiple .wav files

• Take care while selecting value of i, as it depends upon the structure of files, as shown

clc 
clear  
close all 
  
for i=3:103 
%i=3;(initial data) 
 
%Imporing data from audiofiles folder 
files = dir(fullfile('C:\Users\ppurwar\Downloads\audiofiles\'));  %C:\Users\ppurwar\Downloads\audiofiles (folderpath) 
 
[data,fs]=audioread(files(i).name);   %set bias to i according to files structure 
%sound(data(:,1),fs); %To hear sound 
 
datamean=mean(data(:,1));   %finding mean 
 
%Saving output to new folder 
pathname = fileparts('C:\Users\ppurwar\Downloads\audiofiles\result\');%output folder 
out=strcat('datamean',num2str(i),'.mat'); %output data name 
matdata = fullfile(pathname,out);  
save(matdata); 
 
end 

Please refer the following link for further information about MATLAB workspaces and the save function:

https://www.mathworks.com/help/matlab/matlab_env/save-load-and-delete-workspace-variables.html

https://www.mathworks.com/help/matlab/ref/save.html

[Jack]

Hi,

Many thanks for your answer, that is extremely helpful. At what point in the code do I ask Matlab to read in the .wav files?

I have tried running your code and get the error: "Error using audioread (line 90)

The filename specified was not found in the MATLAB path."

Thanks again!

[Prabhan Purwar]

Hey,

First try to identify which files are Matlab able to locate (as shown in the snapshot above), using the following code.

clc 
clear  
close all 
  
for i=3:103 
%i=3;(initial data) 
 
%Imporing data from audiofiles folder 
files = dir(fullfile('C:\Users\ppurwar\Downloads\audiofiles\'));  %C:\Users\ppurwar\Downloads\audiofiles (folderpath) 

** Place the .m file in the same folder where .wav files are located "C:\Users\ppurwar\Downloads\audiofiles\" (as in my case)

Following line of code reads the .wav file

[data,fs]=audioread(files(i).name);

Hope it helps!!

[Thomas Webber]

Hi there,

I was just wondering if I can ask a follow up question to this. Is there any way to use the cat function in this loop to make the data variable contain all the .wav files values. I ideally want to have one data value for all .wav files to do some power spectrum analysis on.

Thanks!

Answer 2

[GreyHunter]

Hello,

Do you know how to read multiple audio files without using the dir function?