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PaddleSpeech/examples/librispeech/asr0/conf/preprocess.yaml

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process:
# extract kaldi fbank from PCM
- type: fbank_kaldi
fs: 16000
n_mels: 161
n_shift: 160
win_length: 400
dither: 0.1
- type: cmvn_json
cmvn_path: data/mean_std.json
# these three processes are a.k.a. SpecAugument
- type: time_warp
max_time_warp: 5
inplace: true
mode: PIL
- type: freq_mask
F: 30
n_mask: 2
inplace: true
replace_with_zero: false
- type: time_mask
T: 40
n_mask: 2
inplace: true
replace_with_zero: false