About us
Orastron was founded by DSP researcher and engineer Stefano D'Angelo in 2021, after leading DSP development at Arturia from 2015 to 2017 and freelancing since 2018.
We are proud to create some of the finest algorithms on the market by combining cutting-edge scientific research and rigorous software development.
These are some of the brands we serve:
In particular, Clack.DIGITAL is our B2C spinoff (currently in the making).
We also continuously collaborate with universities and companies worldwide and invest substantially in research to advance the knowledge in our field.
Here is a selection of our latest published research works:
R. Giampiccolo, S. D'Angelo, A. Bernardini, and A. Sarti, 26th Intl. Conf. Digital Audio Effects (DAFx23), Copenhagen, Denmark, September 2023.
A simplified yet realistic triode model is described that can lead to fully-explicit white box circuit models.
P. P. La Pastina and S. D'Angelo, 25th Intl. Conf. Digital Audio Effects (DAFx20in22), Vienna, Austria, September 2022.
This paper introduces a new and very effective algorithm to reduce aliasing in hard-synced sine waveforms.
P. P. La Pastina and S. D'Angelo, 25th Intl. Conf. Digital Audio Effects (DAFx20in22), Vienna, Austria, September 2022.
Frequency response compensation filters are added in series to antiderivative antialiasing blocks in order allow their use in recursive stateful systems.
L. Gabrielli, S. D'Angelo, P. P. La Pastina, and S. Squartini, IEEE/ACM Trans. Audio, Speech, and Lang. Process., vol. 30, pp. 2743–2753, August 2022.
This paper shows how to apply antiderivative antialiasing methods to generate signals defined as arbitrary piecewise-linear waveforms.
P. P. La Pastina, S. D'Angelo, and L. Gabrielli, 24th Intl. Conf. Digital Audio Effects (DAFx20in21), Vienna, Austria, September 2021.
Antiderivative antialiasing is extended to use arbitrary IIR filters for the virtual downsampling.
P. P. La Pastina and S. D'Angelo, 24th Intl. Conf. Digital Audio Effects (DAFx20in21), Vienna, Austria, September 2021.
A criterion and simple formulas are found to optimally place poles and zeros when approximating fractional order lowpass filters with integer order filters.
- R. Giampiccolo, S. D'Angelo, A. Bernardini, and A. Sarti, "A Quadric Surface Model of Vacuum Tubes for Virtual Analog Applications", 26th Intl. Conf. Digital Audio Effects (DAFx23), Copenhagen, Denmark, September 2023.
- P. P. La Pastina and S. D'Angelo, "A General Antialiasing Method for Sine Hard Sync", 25th Intl. Conf. Digital Audio Effects (DAFx20in22), Vienna, Austria, September 2022.
- P. P. La Pastina and S. D'Angelo, "Antiderivative Antialiasing with Frequency Compensation for Stateful Systems", 25th Intl. Conf. Digital Audio Effects (DAFx20in22), Vienna, Austria, September 2022.
- L. Gabrielli, S. D'Angelo, P. P. La Pastina, and S. Squartini, "Antiderivative Antialiasing for Arbitrary Waveform Generation", IEEE/ACM Trans. Audio, Speech, and Lang. Process., vol. 30, pp. 2743–2753, August 2022.
- P. P. La Pastina, S. D'Angelo, and L. Gabrielli, "Arbitrary-Order IIR Antiderivative Antialiasing", 24th Intl. Conf. Digital Audio Effects (DAFx20in21), Vienna, Austria, September 2021.
- P. P. La Pastina and S. D’Angelo, "Optimal Integer Order Approximation of Fractional Order Filters", 24th Intl. Conf. Digital Audio Effects (DAFx20in21), Vienna, Austria, September 2021.
When it makes sense, we go as far as creating our own analysis and development tools, such as the Ciaramella programming language, the Netmix automated circuit modeling software (publicly unreleased), and the Tibia template-based project generator.
Our primary mission is assisting customers in creating and improving their own products.
Our main area of expertise is virtual analog modeling. We can measure, simulate, model, and implement emulations of entire analog and/or digital devices, whether synthesizers, effect pedals, or studio equipment.
Yet, we are all but afraid to treat other audio DSP topics, such as bandlimited oscillators and antialiasing techniques, wavetable and granular synthesis, FIR and IIR filters, delay-based modulation effects, dynamic processors, distorsions and waveshapers, sound extrapolation, resampling, and more.
We are happy to help startups and established companies, whether it is just about a simple doubt clarification all the way up to designing and implementing new custom audio engines from scratch.