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Update perturb.py #5231

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merged 9 commits into from
Oct 26, 2022
Merged

Update perturb.py #5231

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2bc47e0
Update perturb.py
stevehuang52 Oct 24, 2022
78acbec
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Oct 24, 2022
bfb4bb7
update check and teest
stevehuang52 Oct 25, 2022
6977262
Merge branch 'main' into stevehuang52-patch-1
stevehuang52 Oct 25, 2022
b55ea31
fix test
stevehuang52 Oct 25, 2022
970eba1
Merge branch 'main' into stevehuang52-patch-1
stevehuang52 Oct 25, 2022
6430bd5
Merge branch 'main' into stevehuang52-patch-1
stevehuang52 Oct 25, 2022
b8ea99d
Merge branch 'main' into stevehuang52-patch-1
stevehuang52 Oct 25, 2022
c301a07
Merge branch 'main' into stevehuang52-patch-1
stevehuang52 Oct 25, 2022
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42 changes: 38 additions & 4 deletions nemo/collections/asr/parts/preprocessing/perturb.py
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Original file line number Diff line number Diff line change
Expand Up @@ -432,6 +432,11 @@ def get_one_noise_sample(self, target_sr):
)

def perturb(self, data, ref_mic=0):
"""
Args:
data (AudioSegment): audio data
ref_mic (int): reference mic index for scaling multi-channel audios
"""
noise = read_one_audiosegment(
self._manifest,
data.sample_rate,
Expand All @@ -442,6 +447,18 @@ def perturb(self, data, ref_mic=0):
self.perturb_with_input_noise(data, noise, ref_mic=ref_mic)

def perturb_with_input_noise(self, data, noise, data_rms=None, ref_mic=0):
"""
Args:
data (AudioSegment): audio data
noise (AudioSegment): noise data
data_rms (Union[float, List[float]): rms_db for data input
ref_mic (int): reference mic index for scaling multi-channel audios
"""
if data.num_channels != noise.num_channels:
raise ValueError(
f"Found mismatched channels for data ({data.num_channels}) and noise ({noise.num_channels})."
)

snr_db = self._rng.uniform(self._min_snr_db, self._max_snr_db)
if data_rms is None:
data_rms = data.rms_db
Expand All @@ -467,14 +484,31 @@ def perturb_with_input_noise(self, data, noise, data_rms=None, ref_mic=0):
else:
data._samples += noise._samples

def perturb_with_foreground_noise(
self, data, noise, data_rms=None, max_noise_dur=2, max_additions=1,
):
def perturb_with_foreground_noise(self, data, noise, data_rms=None, max_noise_dur=2, max_additions=1, ref_mic=0):
"""
Args:
data (AudioSegment): audio data
noise (AudioSegment): noise data
data_rms (Union[float, List[float]): rms_db for data input
max_noise_dur: (float): max noise duration
max_additions (int): number of times for adding noise
ref_mic (int): reference mic index for scaling multi-channel audios
"""
if data.num_channels != noise.num_channels:
raise ValueError(
f"Found mismatched channels for data ({data.num_channels}) and noise ({noise.num_channels})."
)

snr_db = self._rng.uniform(self._min_snr_db, self._max_snr_db)
if not data_rms:
data_rms = data.rms_db

noise_gain_db = min(data_rms - noise.rms_db - snr_db, self._max_gain_db)
if data.num_channels > 1:
noise_gain_db = data_rms[ref_mic] - noise.rms_db[ref_mic] - snr_db
else:
noise_gain_db = data_rms - noise.rms_db - snr_db
noise_gain_db = min(noise_gain_db, self._max_gain_db)

n_additions = self._rng.randint(1, max_additions)

for i in range(n_additions):
Expand Down