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WORK IN PROGRESS
NeMo mel spectrogram implements the NeMo/librosa-specific feature extraction pipeline, Slaney mel scale with area normalization, global pre-emphasis, natural log, and a streaming mode with overlap state. Nemotron and Parakeet ASR models will use this functionality.
This differs fundamentally from the Whisper path (log10 + clamp + affine normalization, no pre-emphasis, no streaming), hence created as a separate shared API as there is not much common functionality, and merging would make it much harder to understand.