Audio-Rate Modulation of Physical Model Parameters

Audio-rate modulation of the parameters of physical models is investigated. For example, the resonance frequency of a simple resonator can be modulated smoothly at an audio rate to produce a brighter tone. As with traditional frequency modulation (FM) signal models, complex spectra can be produced through variation of the resonator’s frequency. It is possible to create such hybrid physical/signal models in which the physical portion conserves energy despite the modulation of its parameters. However, most interesting hybrid models will have some nonpassive characteristics. Example models are developed, whose vibrations can be felt and interacted with using a haptic force-feedback device. This technique can make exotic systems tangible that would not normally be found in nature. Hence, if one considers the process of designing a physical model a kind of “dematerialization” process, then one could consider that the present technique is physically “rematerializing” novel audio-rate-modulated virtual objects.