convert mp3 to wav

Hi,

I know that my question has already been asked but my problem is different

I created an Arduino Audio Player that plays wav files from SD through speaker

I want to programatically convert mp3 files to wav using the following settings :

Bit resolution : 8bit

Sampling rate : 16000Hz

Audio channels : mono

PCM format : unsigned 8 bit.

I can easily convert mp3 files using this website

However my internet is pretty slow to upload so I'm intending to do this in Matlab

I created a script that will loop through the mp3 files and convert each one of them

    folder = 'C:\Users\Test\Documents\Audio\mp3'; % folder containing mp3 files
    files = dir( fullfile(folder,'*.mp3') ); % list of mp3 files in folder
    files = {files.name}'; % list of the files (file names)
    for i=1:numel(files) % loop through each file
        fname = fullfile(dirName,files{i}); % fullname of the file
        mp3=audioread(fname);
        newfile=strrep(fname,'mp3','wav');
        wavwrite(mp3,16000,8,newfile);
    end

The files are not correcltly converted and the wav file is full of noise I also get the following warning :

    Warning: Data clipped during write to file:song1.wav 
    > In wavwrite>PCM_Quantize at 280
      In wavwrite>write_wavedat at 302
      In wavwrite at 139
      In convert at 13

Thanks in Advance

[Walter Roberson]

Which MATLAB release are you using? You are not using one of the newest versions: we can tell because wavewrite() no longer exists. But some of the details of what you need to do changed during the releases during which wavewrite did exist.

[Mohamed Amine Messaoudi]

Thanks

I'm using Matlab R2013a

I know what I am doing something wrong.

When I searched I found that for 16 bit precision the values are limited to –1.0 <= y < +1.0 when the signal is provided as floating point format

But I have no idea about the changes I have to make

Answer 1

[Walter Roberson]

Use audiowrite() . It is defined in R2013a https://www.mathworks.com/help/releases/R2013a/matlab/ref/audiowrite.html and permits -1.0 ≤ y ≤ +1.0

Answer 2

[da he]

The follwing procedures was revised based on Mohamed Amine Messaoudi，which can succes run in matlab2019a

%conver MP3 to wav

folder = 'E:\DL_denoise\clips'; % folder containing mp3 files

files = dir( fullfile(folder,'*.mp3') ); % list of mp3 files in folder

files = {files.name}'; % list of the files (file names)

L=length(files) ;

for i=1:L

[y,Fs]=audioread(files{i});

str1=files{i};

filename=strcat(str1(1:end-3),'wav');

audiowrite(filename,y,Fs); %转写成.wav格式文件 convert to wav

end

reference：https://blog.csdn.net/heda3/article/details/89422099