Do online augmentation and global_cmvn conflict with each other?

wenet-e2e / wenet

Production First and Production Ready End-to-End Speech Recognition Toolkit

https://wenet-e2e.github.io/wenet/

Apache License 2.0

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Do online augmentation and global_cmvn conflict with each other? #2489

Closed srdfjy closed 5 months ago

srdfjy commented 5 months ago

Hi，if online augmentation (such as mixing noise, speed perturbation, spectral masking, etc.) is applied, is it better not to apply global_cmvn? This is because global_cmvn is calculated offline in advance, while online augmentation changes the feature distribution.