Read and Write Audio Files - MATLAB & Simulink (original) (raw)
Write data to an audio file, get information about the file, and then read the data back into the MATLAB® workspace.
Write to Audio File
Load sample data from the file, handel.mat
The workspace now contains a matrix of audio data, y, and a sample rate, Fs.
Use the audiowrite function to write the data to a WAVE file named handel.wav in the current folder.
audiowrite("handel.wav",y,Fs) clear y Fs
The audiowrite function also can write to other audio file formats. For a full list of viable formats, see Supported File Formats for Import and Export.
Get Information About Audio File
Use the audioinfo function to get information about the WAVE file, handel.wav.
info = audioinfo("handel.wav")
info = Filename: '_pwd_\handel.wav' CompressionMethod: 'Uncompressed' NumChannels: 1 SampleRate: 8192 TotalSamples: 73113 Duration: 8.9249 Title: [] Comment: [] Artist: [] BitsPerSample: 16
audioinfo returns a 1-by-1 structure array. The SampleRate field indicates the sample rate of the audio data, in hertz. The Duration field indicates the duration of the file, in seconds.
Read Audio File
Use the audioread function to read the file,handel.wav. The audioread function can support other file formats. For a full list of viable formats, see Supported File Formats for Import and Export.
[y,Fs] = audioread("handel.wav");
Play the audio.
You also can read files interactively. Select 
Import Data or double-click the file name in the Current Folder browser.
Plot Audio Data
Create a vector t the same length as y, that represents elapsed time.
t = 0:seconds(1/Fs):seconds(info.Duration); t = t(1:end-1);
Plot the audio data as a function of time.
plot(t,y) xlabel('Time') ylabel('Audio Signal')
See Also
audioinfo | audioread | audiowrite