dlpy.audio.AudioTable.extract_audio_features

classmethod AudioTable.extract_audio_features(conn, table, frame_shift=10, frame_length=25, n_bins=40, n_ceps=40, feature_scaling_method='STANDARDIZATION', n_output_frames=500, casout=None, random_shuffle=True, **kwargs)

Extracts audio features from the audio files

Parameters:

conn : CAS

A connection object to the current session.

table : AudioTable

An audio table containing the audio files.

frame_shift : int, optional

Specifies the time difference (in milliseconds) between the beginnings of consecutive frames.
Default: 10

frame_length : int, optional

Specifies the length of a frame (in milliseconds).
Default: 25

n_bins : int, optional

Specifies the number of triangular mel-frequency bins.
Default: 40

n_ceps : int, optional

Specifies the number of cepstral coefficients in each MFCC feature frame (including C0).
Default: 40

feature_scaling_method : string, optional

Specifies the feature scaling method to apply to the computed feature vectors.
Default: ‘standardization’

n_output_frames : int, optional

Specifies the exact number of frames to include in the output table (extra frames are dropped and missing frames are padded with zeros).
Default: 500

casout : dict or string or CASTable, optional

CAS Output table

random_shuffle : bool, optional

Specifies whether shuffle the generated CAS table randomly.
Default: True

kwargs : keyword-arguments, optional

Additional parameter for feature extraction. For details, see the documentation for audio.computeFeatures.

Returns:

AudioTable

If table exists

None

If no table exists

Examples

>>> import swat
>>> from dlpy.audio import AudioTable
>>> s=swat.CAS("cloud.example.com", 5570)
>>> aud_table = AudioTable.load_audio_files(s, "/path/to/audio/file.txt")
>>> feature_table = aud_table.extract_audio_features(s, aud_table)
>>> feature_table.summary()