Read and Write Audio Files
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,
The workspace now contains a matrix of audio data,
and a sample rate,
audiowrite function to write
the data to a WAVE file named
handel.wav in the
audiowrite('handel.wav',y,Fs) clear y Fs
audiowrite function also can write
to other audio file formats such as OGG, FLAC, and MPEG-4 AAC.
Get Information About Audio File
audioinfo function to get information
about the WAVE file,
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.
SampleRate field indicates the sample rate
of the audio data, in hertz. The
indicates the duration of the file, in seconds.
Read Audio File
audioread function to read the
can support WAVE, OGG, FLAC, AU, MP3, and MPEG-4 AAC files.
[y,Fs] = audioread('handel.wav');
Play the audio.
You also can read WAV, AU, or SND 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
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')