Applications of Generative String-Substitution Systems in by DuBois R.L.

By DuBois R.L.

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Extra resources for Applications of Generative String-Substitution Systems in Computer Music [PhD Thesis]

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In fact, the only symbol that causes the turtle to actually do anything is ‘F’. The rest of the time, our graphics system is simply making internal adjustments to its algorithm. Keeping that in mind, we could easily reduce this entire string to a single musical event (such as a three- 4 This will inevitably happen when two different parser typologies are used for the sound and the graphics. A parser that uses metadata (turtle graphics) for the image and a parser that directly evaluates every symbol for the music will not necessarily correlate as well as we might like, simply because they have different ‘active’ and ‘passive’ symbols.

Ergonomic mapping, which we’ll describe first to briefly introduce the concept of mapping as a whole, is the process by which physical events are translated into instructions for the computer program. These events occur external to the system and, as a result, need to be treated with very few suppositions as to their raw content. For example, a computer program that claims to deduce the pitches of a musical performance, but only works reliably if the performer plays perfectly in tune at all times, would be next 1 For a good overview of some of the main issues in mapping in interactive music, see Paradiso, 1999.

22 45 By inserting a flexible parametric parser between our L-system and our musical output, however, we’ve massively expanded the potential complexity of our mapping system. The risk inherent in this endeavor is obvious; as the ratio of metadata to event data increases, the less our musical output will directly reflect the Lindenmayer input. With this in mind, the important concern of how to maintain musical salience in terms of the features of the L-system in question needs to be addressed. While there exists no sure formula for designing a parser system, a few ideas come to mind.

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