(fbank, sr=8000, feature_size=40)
return np.stack([fbank, delta, _delta_delta], axis=-1)
params:
    fbank: [nframe, nfbank]
  return : [nframe, nfbank, 3]
params:
    fbank: [nframe, nfbank]
  return : [nframe, nfbank, 3]
params : fbank : [ nframe nfbank ] return : [ nframe nfbank 3 ]
def delta_delta(fbank, sr=8000, feature_size=40):
  '''
  params:
    fbank: [nframe, nfbank]
  return : [nframe, nfbank, 3]
  '''
  del sr, feature_size
  assert fbank.ndim == 2
  delta = psf.delta(fbank, N=2)
  _delta_delta = psf.delta(delta, N=2)
  return np.stack([fbank, delta, _delta_delta], axis=-1)
def delta_delta ( fbank , sr = 8000 , feature_size = 40 ) : del sr , feature_size assert fbank . ndim == 2 delta = psf . delta ( fbank , N = 2 ) _delta_delta = psf . delta ( delta , N = 2 ) return np . stack ( [ fbank , delta , _delta_delta ] , axis = - 1 )