mindspore.dataset.audio.DCShift

class mindspore.dataset.audio.DCShift(shift, limiter_gain=None)[source]

Apply a DC shift to the audio. This can be useful to remove DC offset from audio.

Parameters

shift (float) – The amount to shift the audio, the value must be in the range [-2.0, 2.0].
limiter_gain (float, optional) – Used only on peaks to prevent clipping, the value should be much less than 1, such as 0.05 or 0.02.

Examples

>>> import numpy as np
>>>
>>> waveform = np.array([0.60, 0.97, -1.04, -1.26, 0.97, 0.91, 0.48, 0.93])
>>> numpy_slices_dataset = ds.NumpySlicesDataset(data=waveform, column_names=["audio"])
>>> transforms = [audio.DCShift(0.5, 0.02)]
>>> numpy_slices_dataset = numpy_slices_dataset.map(operations=transforms, input_columns=["audio"])