models/nemoAsr/src/nemo_asr_features
library
Functions
-
nemoAsrFrames(int samples)
→ int
-
The number of feature frames for
samples samples: one per 10 ms hop,
plus one.
-
nemoAsrLogMel(Float32List samples, int melBins)
→ Float32List
-
Computes the log-mel features of NeMo's
AudioToMelSpectrogramPreprocessor
with the settings of the FastConformer and Parakeet models: preemphasis
0.97, a 512-point STFT of a symmetric 400-sample Hann window with a hop of
160 and zero padding at both ends, a power spectrum, melBins Slaney mel
filters from 0 to 8 kHz, log(x + 2^-24), and per-feature normalization
(mean 0, unbiased standard deviation 1).
