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Getting started with audio data |
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You can read, preprocess and analyze audio files in the same way as EEG or MEG files. This can for example be handy to determine the spectrogram (e.g., using a time-frequency analysis) or to determine the onset of speech.
The following reads the continuous audio data, in this case from a 4-channel WAV file. Most other audio file formats are also supported.
cfg = []; cfg.dataset = '4ch.wav'; data = ft_preprocessing(cfg)
The following information will be printed on screen:
processing channel { '4ch channel 1' '4ch channel 2' '4ch channel 3' '4ch channel 4' }
reading and preprocessing
reading and preprocessing trial 1 from 1
the call to "ft_preprocessing" took 1 seconds and required the additional allocation of an estimated 55 MB
data =
struct with fields:
hdr: [1x1 struct]
label: {4x1 cell}
time: {[1x211355 double]}
trial: {[4x211355 double]}
fsample: 44100
sampleinfo: [1 211355]
cfg: [1x1 struct]
Also usefull can be to use ft_databrowser to have a quick look at the time series.
cfg = [];
cfg.dataset = '4ch.wav';
ft_databrowser(cfg);