mindspore.dataset.audio.DBToAmplitude

class mindspore.dataset.audio.DBToAmplitude(ref, power)[source]

Turn a waveform from the decibel scale to the power/amplitude scale.

Parameters

ref (float) – Reference which the output will be scaled by.
power (float) – If power equals 1, will compute DB to power. If 0.5, will compute DB to amplitude.

Raises

TypeError – If ref is not of type float.
TypeError – If power is not of type float.

Supported Platforms:: CPU

Examples

>>> import numpy as np
>>> import mindspore.dataset as ds
>>> import mindspore.dataset.audio as audio
>>>
>>> waveform = np.array([[2.716064453125e-03, 6.34765625e-03], [9.246826171875e-03, 1.0894775390625e-02]])
>>> numpy_slices_dataset = ds.NumpySlicesDataset(data=waveform, column_names=["audio"])
>>> transforms = [audio.DBToAmplitude(0.5, 0.5)]
>>> numpy_slices_dataset = numpy_slices_dataset.map(operations=transforms, input_columns=["audio"])

Tutorial Examples:

Illustration of audio transforms