Main Content

audioDatastore Object Pointing to Audio Files

Open Live Script

To create an audioDatastore object, first specify the file path to the audio samples included with Audio Toolbox™.

folder = fullfile(matlabroot,'toolbox','audio','samples');

Create an audioDatastore object that points to the specified folder of audio files.

ADS = audioDatastore(folder)
ADS = 
  audioDatastore with properties:

                       Files: {
                              ' .../matlab/toolbox/audio/samples/Ambiance-16-44p1-mono-12secs.wav';
                              ' .../matlab/toolbox/audio/samples/AudioArray-16-16-4channels-20secs.wav';
                              ' .../toolbox/audio/samples/ChurchImpulseResponse-16-44p1-mono-5secs.wav'
                               ... and 36 more
                              }
                     Folders: {
                              ' .../Bdoc24b.2725827/build/runnable/matlab/toolbox/audio/samples'
                              }
    AlternateFileSystemRoots: {}
              OutputDataType: 'double'
           OutputEnvironment: 'cpu'
                      Labels: {}
      SupportedOutputFormats: ["wav"    "flac"    "ogg"    "opus"    "mp3"    "mp4"    "m4a"]
         DefaultOutputFormat: "wav"

Generate a subset of the audio datastore that only includes audio files containing 'Guitar' in the file name. 

fileContainsGuitar = cellfun(@(c)contains(c,'Guitar'),ADS.Files);
ADSsubset = subset(ADS,fileContainsGuitar)
ADSsubset = 
  audioDatastore with properties:

                       Files: {
                              ' .../matlab/toolbox/audio/samples/RockGuitar-16-44p1-stereo-72secs.wav';
                              ' .../matlab/toolbox/audio/samples/RockGuitar-16-96-stereo-72secs.flac';
                              ' .../runnable/matlab/toolbox/audio/samples/SoftGuitar-44p1_mono-10mins.ogg'
                              }
                     Folders: {
                              ' .../Bdoc24b.2725827/build/runnable/matlab/toolbox/audio/samples'
                              }
    AlternateFileSystemRoots: {}
              OutputDataType: 'double'
           OutputEnvironment: 'cpu'
                      Labels: {}
      SupportedOutputFormats: ["wav"    "flac"    "ogg"    "opus"    "mp3"    "mp4"    "m4a"]
         DefaultOutputFormat: "wav"

Use the subset audio datastore as the source for a labeledSignalSet object.

audioLabSigSet = labeledSignalSet(ADSsubset)
audioLabSigSet = 
  labeledSignalSet with properties:

             Source: {3x1 cell}
         NumMembers: 3
    TimeInformation: "inherent"
             Labels: [3x0 table]
        Description: ""

 Use labelDefinitionsHierarchy to see a list of labels and sublabels.
 Use setLabelValue to add data to the set.

Open Signal Labeler and use Import From Workspace to import the labeledSignalSet.