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Capture and Representation of Natural Instrument Sound-Radiation
It is desirable to describe natural sound sources more accurately, as to enhance the realism of artificial reproduction of natural acoustic events. For that purpose, it does not seem to be sufficient anymore to take single-channel recordings of a musical instrument using one microphone, in general. Moreover, it becomes necessary to surround the musical instrument, the voice, the noise source, etc., with a multiplity of microphones, in order to capture a complete image of the radiated sound. The hereby recorded signals of one particular acoustical event illustrate how acoustic radiation sounds at a multiplicity of directions, simultaneously. In doing so, quite accurate inference is enabled on the complete acoustic radiation of a sound source, which is inaccessible using one single microphone. Firstly, this method brings new findings to musical acoustics. Several aspects of directional sound-radiation of individual instruments can be observed: How strong does the directional sound-radiation depend on the note played on the instrument, and the playing thechnique? Can it be used for other instruments, and how does it depend on space, time, and frequency? The colloquium talk illustrates the basic relationships and questions, experimental measurement setups, and methods of analysis. Furthermore, several results are shown concerning recent research on musical acoustics. Aside from musical acoustics, also virtual sound scape reproduction, analysis of acoustic noise sources, but also art and computer music are expected to benefit from the methods presented.