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spafe.utils.filters#
Description : Filter utils implementation.
Copyright (c) 2019-2024 Ayoub Malek. This source code is licensed under the terms of the BSD 3-Clause License. For a copy, see <https://github.com/SuperKogito/spafe/blob/master/LICENSE>.
- spafe.utils.filters.rasta_filter(x: ndarray) ndarray[source]#
Implementing the RASTA filter as in [Ellis-plp].
- Parameters
x (numpy.ndarray) – input signal.
- Returns
filtered signal.
- Return type
Note
default filter is single pole at 0.94
rows of x = number of frames
cols of x = critical bands
- spafe.utils.filters.scale_fbank(scale: typing_extensions.Literal[ascendant, descendant, constant], nfilts: int) ndarray[source]#
Generate scaling vector.
- Parameters
- Returns
scaling vector.
- Return type
Note
\[ \begin{align}\begin{aligned}ascendant : \frac{1}{nfilts} \times [ 1, ..., i, ..., nfilts]\\descendant : \frac{1}{nfilts} \times [ nfilts, ..., i, ..., 1]\end{aligned}\end{align} \]