mindspore.dataset.audio.FrequencyMasking

class mindspore.dataset.audio.FrequencyMasking(iid_masks=False, freq_mask_param=0, mask_start=0, mask_value=0.0)[source]

Apply masking to a spectrogram in the frequency domain.

Note

The dimension of the audio waveform to be processed needs to be (…, freq, time).

Parameters

  • iid_masks (bool, optional) – Whether to apply different masks to each example/channel. Default: False.

  • freq_mask_param (int, optional) – When iid_masks is True, length of the mask will be uniformly sampled from [0, freq_mask_param]; When iid_masks is False, directly use it as length of the mask. The value should be in range of [0, freq_length], where freq_length is the length of audio waveform in frequency domain. Default: 0.

  • mask_start (int, optional) – Starting point to apply mask, only works when iid_masks is True. The value should be in range of [0, freq_length - freq_mask_param], where freq_length is the length of audio waveform in frequency domain. Default: 0.

  • mask_value (float, optional) – Value to assign to the masked columns. Default: 0.0.

Raises

  • TypeError – If iid_masks is not of type bool.

  • TypeError – If freq_mask_param is not of type integer.

  • ValueError – If freq_mask_param is greater than the length of audio waveform in frequency domain.

  • TypeError – If mask_start is not of type integer.

  • ValueError – If mask_start is a negative number.

  • TypeError – If mask_value is not of type float.

  • ValueError – If mask_value is a negative number.

  • RuntimeError – If input tensor is not in shape of <…, freq, time>.

Supported Platforms:

CPU

Examples

>>> import numpy as np
>>>
>>> waveform = np.random.random([1, 3, 2])
>>> numpy_slices_dataset = ds.NumpySlicesDataset(data=waveform, column_names=["audio"])
>>> transforms = [audio.FrequencyMasking(freq_mask_param=1)]
>>> numpy_slices_dataset = numpy_slices_dataset.map(operations=transforms, input_columns=["audio"])
../../_images/frequency_masking_original.png ../../_images/frequency_masking.png