The predator-prey population model based on the Lotka-
Volterra system of nonlinear differential equations is here
solved using discrete-time signal processing techniques.
This approach makes the model solution appealing for in-
teractive sound synthesis purposes, meanwhile making its
numerical integration easy to understand for the sound de-
signer and the music composer. The resulting digital filter
network requires to compute two delay-free loops sharing
a signal multiplier, in practice realizing an implicit solver:
this family of solvers provides robustness in front of the
structural instability of the Lotka-Volterra system even in
presence of abrupt changes of the evolutionary parame-
ters, hence affording interactive model control. A real-time
implementation of the resulting realization is provided in
form of a Java external for the software Puredata.
