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PaddleSpeech/paddlespeech/s2t/frontend/augmentor/noise_perturb.py

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# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Contains the noise perturb augmentation model."""
import jsonlines
from paddlespeech.s2t.frontend.audio import AudioSegment
from paddlespeech.s2t.frontend.augmentor.base import AugmentorBase
class NoisePerturbAugmentor(AugmentorBase):
"""Augmentation model for adding background noise.
:param rng: Random generator object.
:type rng: random.Random
:param min_snr_dB: Minimal signal noise ratio, in decibels.
:type min_snr_dB: float
:param max_snr_dB: Maximal signal noise ratio, in decibels.
:type max_snr_dB: float
:param noise_manifest_path: Manifest path for noise audio data.
:type noise_manifest_path: str
"""
def __init__(self, rng, min_snr_dB, max_snr_dB, noise_manifest_path):
self._min_snr_dB = min_snr_dB
self._max_snr_dB = max_snr_dB
self._rng = rng
with jsonlines.open(noise_manifest_path, 'r') as reader:
self._noise_manifest = list(reader)
def __call__(self, x, uttid=None, train=True):
if not train:
return x
self.transform_audio(x)
return x
def transform_audio(self, audio_segment):
"""Add background noise audio.
Note that this is an in-place transformation.
:param audio_segment: Audio segment to add effects to.
:type audio_segment: AudioSegmenet|SpeechSegment
"""
noise_json = self._rng.choice(self._noise_manifest, 1, replace=False)[0]
if noise_json['duration'] < audio_segment.duration:
raise RuntimeError("The duration of sampled noise audio is smaller "
"than the audio segment to add effects to.")
diff_duration = noise_json['duration'] - audio_segment.duration
start = self._rng.uniform(0, diff_duration)
end = start + audio_segment.duration
noise_segment = AudioSegment.slice_from_file(
noise_json['audio_filepath'], start=start, end=end)
snr_dB = self._rng.uniform(self._min_snr_dB, self._max_snr_dB)
audio_segment.add_noise(
noise_segment, snr_dB, allow_downsampling=True, rng=self._rng)