PyDSM
Python toolbox for the design and simulation of delta-sigma modulators. It contains a helper module, pydsm.iso226, with ISO 226:2003 equal-loudness contours.
| Repository | https://github.com/sergiocallegari/PyDSM |
|---|---|
| Documentation | https://pythonhosted.org/pydsm/pydsm.iso226.html |
| Language | Python |
| Kind | Library/Toolbox Functions to call from your own code: a Python package, a MATLAB toolbox, or a C, C++, C#, Rust or Julia library. |
| Group | established Described in a publication, used by others, or written by the authors of the model, with more than a year of history. |
| Licence | GPL-3.0-or-later |
| Package | PyPI pydsm |
| Install | pip install pydsm |
| Latest release | 0.15.2 (2025-08) |
| Last commit | 2025-08-22 inactive since 2025-08 |
| GitHub stars | 22 |
| Maintainers | Sergio Callegari |
| AI assistance | not stated |
| How to cite | The README asks users to cite two papers by Callegari and Bizzarri on the design of ΔΣ modulators (the journal versions). Name the version or commit you used. |
| Entry checked | 6 October 2026 |
What it implements
| Metric | Edition | Functions | Validation (as stated) | Notes |
|---|---|---|---|---|
| Equal-loudness contours | ISO 226:2003 tabled and interpolated contours; optional 20 kHz extension | pydsm.iso226 | not stated | — |
How it was validated
As reported by the project; LISQM has not run the code. Two implementations that agree can still share the same error. Kinds of evidence.
The project does not say how any of these were validated.
Notes
- The
pydsm.iso226module was added in August 2013 and cites Jeff Tackett's 2005 MATLAB ISO 226 code. Its tables can optionally be extended with a data point at 20 kHz. - A standalone extraction of the module, jacobbaylesssmc/iso226 (GPL-3.0, two commits on 2019-07-09), also exists.
Before you rely on it
- ISO 226:2003 was withdrawn in 2023 and replaced by ISO 226:2023; the module follows the 2003 edition.