DuBois R.L.'s Applications of Generative String-Substitution Systems in PDF

By DuBois R.L.

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

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This eliminates any restrictions on musical output that are asserted by using the same set of rules over and over again throughout a piece. • Our system replaces a set axiom with symbolic information supplied by a human performer (or, for that matter, a computer performer). A composer can supply the performer with a score, improvisational guidelines, or a set of rules that she or he can then use to input a stream of variable data into the system. As a result, the music generated by the system no longer depends on the Lindenmayer rule set as the sole variable factor.

In fact, we could even omit it entirely. If we still desire a spatial mapping of the L-system, we can introduce rules into the musical interpreter module (now a separate entity) that mimic the graphical behavior of the turtle. This is both more flexible and more efficient: we no longer have to interpret the turtle’s moves on a graphical surface to infer musical data; we can derive that data 23 directly from the Lindenmayer string by interpreting symbols as cogent musical information. • A score following module is added to the system, allowing the interpretation (both within the Lindenmayer rule set and within the musical mapping system) to change over time, in response to a formal timeline or in reaction to performer input (see below).

Rather than being mapped to events themselves, these symbols can be mapped to instructions to a virtual musical interpreter akin in scope to a turtle interpreter. If we revisit our turtle graphics instruction set for a moment, we remember that in most Lindenmayer parsers, symbols are not treated equally in terms of their direct consequence. Often, the true meaning of a symbol only becomes clear when one considers its context. Symbols earlier in the string influence symbols later in the string, and a symbol at any given point is defined only by the symbols leading up to it, even though the grammar model uses the same systems and rules for generating all the symbols in the alphabet.

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Applications of Generative String-Substitution Systems in Computer Music [PhD Thesis] by DuBois R.L.

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