nnmnkwii.preprocessing.preemphasis¶

nnmnkwii.preprocessing.preemphasis(x, coef=0.97)[source]¶

Pre-emphasis

Parameters

x (1d-array) – Input signal.
coef (float) – Pre-emphasis coefficient.

Returns

Output filtered signal.

Return type

array

See also

inv_preemphasis()

Examples

>>> from nnmnkwii.util import example_audio_file
>>> from scipy.io import wavfile
>>> fs, x = wavfile.read(example_audio_file())
>>> x = x.astype(np.float64)
>>> from nnmnkwii import preprocessing as P
>>> y = P.preemphasis(x, coef=0.97)
>>> assert x.shape == y.shape