27 lines
1.4 KiB
Text
27 lines
1.4 KiB
Text
flowrs-dsp
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Copyright 2024-2026 David Charlot and the flowRS contributors
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Licensed under either of the Apache License, Version 2.0 (LICENSE-APACHE) or the MIT
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license (LICENSE-MIT), at your option. This crate is part of flowRS.
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Third-party material:
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Ports from SciPy (BSD-3-Clause, LICENSES/SciPy-BSD-3-Clause.txt):
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SciPy, Copyright (c) 2001-2002 Enthought, Inc. 2003, SciPy Developers.
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- src/filters.rs: Cascade::filtfilt and its section seeding (scipy.signal.sosfiltfilt,
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sosfilt_zi) and odd_ext (scipy.signal._arraytools.odd_ext);
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- src/elliptic.rs: ellipdeg (scipy.signal._filter_design._ellipdeg) and asne
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(scipy.signal._filter_design._arc_jac_sn);
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- src/filters.rs: the Bessel pole table, values computed with scipy.signal.besselap.
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SciPy and NumPy are also the oracles the designers are checked against
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(tools/verify_filters.py in flowRS): values in the tests come from running them.
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Methods implemented from published sources, with no code taken: the real-argument Jacobi
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functions by the arithmetic-geometric mean and the complex-argument addition theorems
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(Abramowitz & Stegun, Handbook of Mathematical Functions, 16.4 and 16.21); the elliptic
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pole and zero placement (Sophocles J. Orfanidis, Lecture Notes on Elliptic Filter Design,
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Rutgers University, 2006); the biquad formulas (Robert Bristow-Johnson, Audio EQ
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Cookbook); spectral-flux onset detection (Bello et al., 2005).
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