Orastron

Products

A-SID

Turn your C64 into a wah effect.

Services

If you need support in developing DSP code for digital music products, whether hardware or software, ranging from simple audio effects to complex virtual instrument plugins, we are here to assist you.

Our founder and CEO has been serving some of the best companies in the market for years. Check out his portfolio.

Here is what we offer.

Virtual analog

This is our main area of expertise.

We can measure, simulate, model, and implement emulations of entire analog and/or digital devices, whether synthesizers, effect pedals, or studio equipment.

You'll tell us how to balance accuracy, resource usage, and effort according to your specific project requirements.

Music DSP

We've also got you covered should your projects require expertise in other topics and techniques, including

bandlimited oscillators and anti-aliasing,
wavetable and granular synthesis,
FIR and IIR filters,
delay-based and modulation effects,
dynamic processors,
distortions and waveshapers,
sound extrapolation,
or resampling.

Other services

You can also ask us about related activities, such as

development of sound analysis and processing tools,
measurement and analysis of circuits, devices, and software,
independent revision of research, algorithms, software, and hardware products,
scientific research,
professional training,
and professional opinions.

Just contact us

Tools

DSP modules

For most projects to be successful, special effort should be sharply focused and only spent on a few parts.

Our unique set of highly-reusable DSP modules allows you to free your hands and concentrate on more meaningful work. We license each individually with full source code access and without limitations on the number of projects and developers within your organisation that can use them.

They even work on the web!

Try online

Ciaramella

A new open source audio DSP programming language with an intuitive declarative syntax and an embeddable source-to-source compiler written in JavaScript with C, MATLAB, and JavaScript output targets.

The project is still in its early infancy, yet it can already naturally represent highly-coupled DSP structures.

Official website

Research

Our daily activity is highly interdisciplinary and requires a wide knowledge in mathematics, physics, acoustics, electronics, digital signal processing, computer science, psychoacoustics, music theory, and music production.

We leverage scientific principles and state-of-the-art techniques in order to define, implement, and refine repeatable processes that yield solid results. At the same time we strive to flexibly adapt our methods to the peculiarities of each project.

We continuously collaborate with universities and companies worldwide and invest substantially in research to advance the knowledge in our field. Here is a selected list of scientific publications we have authored.

A General Antialiasing Method for Sine Hard Sync
P. P. La Pastina and S. D’Angelo, 25^th 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.
Read paper
Antiderivative Antialiasing with Frequency Compensation for Stateful Systems
P. P. La Pastina and S. D’Angelo, 25^th 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.
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Antiderivative Antialiasing for Arbitrary Waveform Generation
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,
This paper shows how to apply antiderivative antialiasing methods to generate signals defined as arbitrary piecewise-linear waveforms.
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Ciaramella: A Synchronous Data Flow Programming Language For Audio DSP
P. Marrone, S. D’Angelo, F. Fontana, G. Costagliola, and G. Puppis, Sound and Music Computing 2022 (SMC-22), Saint-Étienne, France, June 2022.
This paper introduces the Ciaramella DSP language and its compiler named Zampogna in their first development iteration.
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Arbitrary-Order IIR Antiderivative Antialiasing
P. P. La Pastina, S. D’Angelo, and L. Gabrielli, 24^th Intl. Conf. Digital Audio Effects (DAFx20in21), Vienna, Austria, September 2021.
Antiderivative antialiasing is extended to use arbitrary IIR filters for the virtual downsampling.
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Optimal Integer Order Approximation of Fractional Order Filters
P. P. La Pastina and S. D’Angelo, 24^th 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.
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