30 September 2016 Generation of rhythm patterns from harmonic structures in power modulated light
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Abstract
In the past few years we investigated effects of perception of combined acoustical and optical stimuli. These investigations were triggered by the quest for coherence effects in artificially illuminated environment in conjunction with acoustic immissions. Further, harmonies and chords transposed down to frequencies near flicker perception carried by power modulated light in combination with the coherent acoustic stimuli in audible range were subject to research. A deeper discussion is found in previous SPIE papers. These chord experiments showed that - depending on the spatial distribution of light sources and their spots - rhythmic patterns in time and space are generated by the beat frequencies occurring between the chord components. While these results might have consequences in problems of occupational medicine - the original intention of such studies - there might be applications in music and entertainment. The recent paper deals with a deeper discussion of the interference process in power domain and the limits of perception. The resulting rhythm patterns show a fine structure beside the main beat resulting from the frequency differences of the components, which was not considered in earlier works, but obviously depends on phase and signal shape of the components. A basic framework for the design of optical rhythm pattern corresponding to certain sounds is derived. Especially interesting is the question of perception of static phase of the components of chords in both acoustical and optical domains. The paper will give some practical examples, which are part of the talk and the multimedia attachment.
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Cornelius Hahlweg, Cornelius Hahlweg, Kai Jäger, Kai Jäger, Cornelia Weyer, Cornelia Weyer, Jürgen Weiß, Jürgen Weiß, "Generation of rhythm patterns from harmonic structures in power modulated light", Proc. SPIE 9948, Novel Optical Systems Design and Optimization XIX, 99480X (30 September 2016); doi: 10.1117/12.2237891; https://doi.org/10.1117/12.2237891
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