Petter Harald Ericson

Biographie

Petter Ericson is a formal language and theoretical computing science expert, specifically focused on efficient graph grammars formalisms, who has joined the DCML as a Postdoctoral Researcher in 2019. He achieved his undergraduate degrees in Computing Science, as well as his PhD in the same subject, at Umeå University, investigating various topics within the general area of (parameterized) complexity theory, automata theory and formal languages, specifically looking at more complex structures such as graphs and trees. In particular, his work touched on applications in Natural Language Processing such as mildly context-sensitive syntax analysis and semantic modelling and processing. An avid trombonist and amateur composer and arranger as well as a sometimes hacker and maker, his musical and research interests have previously intersected at the international Music Tech Fest events, where his presentations has garnered two hack camp wins, and a semi-regular place in the organising team.

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It is well known that hyperedge-replacement grammars can generate NP-complete graph languages even under seemingly harsh restrictions. This means that the parsing problem is difficult even in the non-uniform setting, in which the grammar is considered to be fixed rather than being part of the input. Little is known about restrictions under which truly uniform polynomial parsing is possible. In this paper we propose a low-degree polynomialtime algorithm that solves the uniform parsing problem for a restricted type of hyperedgereplacement grammars which we expect to be of interest for practical applications. (c) 2020 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

ACADEMIC PRESS INC ELSEVIER SCIENCE2021

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Concordia: A musical XR instrument for playing the solar system

Petter Harald Ericson

Kepler Concordia, a new scientific and musical instrument enabling players to explore the solar system and other data within immersive extended-reality (XR) platforms, is being designed by a diverse team of musicians, artists, scientists and engineers using audio-first principles. The core instrument modules will be launched in 2019 for the 400th anniversary of Johannes Kepler's Harmonies of the World, in which he laid out a framework for the harmony of geometric form as well as the three laws of planetary motion. Kepler's own experimental process can be understood as audio-first because he employed his understanding of Western Classical music theory to investigate and discover the heliocentric, elliptical behaviour of planetary orbits. Indeed, principles of harmonic motion govern much of our physical world and show up at all scales in mathematics and physics. Few physical systems, however, offer such rich harmonic complexity and beauty as our own solar system. Concordia is a musical instrument that is modular, extensible and designed to allow players to generate and explore transparent sonifications of planetary movements rooted in the musical and mathematical concepts of Johannes Kepler as well as researchers who have extended Kepler's work, such as Hartmut Warm. Its primary function is to emphasise the auditory experience by encouraging musical explorations using sonification of geometric and relational information of scientifically accurate planetary ephemeris and astrodynamics. Concordia highlights harmonic relationships of the solar system through interactive sonic immersion. This article explains how we prioritise data sonification and then add visualisations and gamification to create a new type of experience and creative distributed-ledger powered ecosystem. Kepler Concordia facilitates the perception of music while presenting the celestial harmonies through multiple senses, with an emphasis on hearing, so that, as Kepler wrote, 'the mind can seize upon the patterns'.

ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD2020

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The Jazz Harmony Treebank

Petter Harald Ericson, Christoph Finkensiep, Daniel Harasim, Martin Alois Rohrmeier

Grammatical models which represent the hierarchical structure of chord sequences have proven very useful in recent analyses of Jazz harmony. A critical resource for building and evaluating such models is a ground-truth database of syntax trees that encode hierarchical analyses of chord sequences. In this paper, we introduce the Jazz Harmony Treebank (JHT), a dataset of hierarchical analyses of complete Jazz standards. The analyses were created and checked by experts, based on lead sheets from the open iRealPro collection. The JHT is publicly available in JavaScript Object Notation (JSON), a human-understandable and machine-readable format for structured data. We additionally discuss statistical properties of the corpus and present a simple open-source web application for the graphical creation and editing of trees which was developed during the creation of the dataset.

ISMIR2020

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Concordia: A musical XR instrument for playing the solar system

Petter Harald Ericson

ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD2020