aspcore 0.0.3

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ASPCORE : Audio Signal Processing Core

Introduction

The package contains classes and functions implementing different versions of linear convolutions. What makes them useful above what's already available in scipy and numpy is that they are intended to be used in a streaming manner, where only parts of the input signal is available at a time. All filters support multiple inputs and multiple outputs. There is also support for convolution with a time-varying impulse response.

The package uses just-in-time compilation from numba to achieve lower computational cost.

More info and complete API documentation

Installation

The package can be installed via pip by running

pip install aspcore

Alternatively, the package can be installed by cloning the repository and running

pip install path/to/aspcore

License

The software is distributed under the MIT license. See the LICENSE file for more information.

Acknowledgements

The software has been developed during a PhD project as part of the SOUNDS ETN at KU Leuven. The SOUNDS project has recieved funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 956369.

Usage

The main function of this package is create_filter(). Using the keyword arguments, it will select and return the appropriate filter class. The filter can then be used to convolve using its process() method, which returns the filtered signal.

Signals are formatted with the time index as the last axis, with most filters accepting signals of the form (num_channels, num_samples). Some filters accepts signals with higher dimensional channels, such as (a, b, c, ..., num_samples).

import numpy as np
import aspcore
rng = np.random.default_rng()

channels_in, channels_out, num_samples, ir_len = 5, 3, 128, 16

signal = rng.normal(0,1,size=(channels_in, num_samples))
ir = rng.normal(0,1,size=(channels_out, ir_len))

filt = aspcore.create_filter(ir=ir, sum_over_inputs=True)

filtered_signal = filt.process(signal)