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44 lines
1.6 KiB
44 lines
1.6 KiB
7 years ago
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"""Contain the speech perturbation augmentation model."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from data_utils.augmentor.base import AugmentorBase
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class SpeedPerturbAugmentor(AugmentorBase):
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"""Augmentation model for adding speed perturbation.
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See reference paper here:
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http://www.danielpovey.com/files/2015_interspeech_augmentation.pdf
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:param rng: Random generator object.
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:type rng: random.Random
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:param min_speed_rate: Lower bound of new speed rate to sample.
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:type min_speed_rate: float
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:param max_speed_rate: Upper bound of new speed rate to sample.
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:type max_speed_rate: float
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"""
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def __init__(self, rng, min_speed_rate, max_speed_rate):
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if (min_speed_rate < 0.5):
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raise ValueError("Sampling speed below 0.9 can cause unnatural effects")
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if (max_speed_rate > 1.5):
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raise ValueError("Sampling speed above 1.1 can cause unnatural effects")
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self._min_speed_rate = min_speed_rate
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self._max_speed_rate = max_speed_rate
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self._rng = rng
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def transform_audio(self, audio_segment):
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"""Sample a new speed rate from the given range and
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changes the speed of the given audio clip.
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Note that this is an in-place transformation.
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:param audio_segment: Audio segment to add effects to.
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:type audio_segment: AudioSegment|SpeechSegment
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"""
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sampled_speed = self._rng.uniform(self._min_speed_rate, self._max_speed_rate)
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audio_segment.change_speed(sampled_speed)
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