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instead of the point-based one explained above. Players can enjoy reforming
the scenery of sounds by applying the sting and release and change opera-
tions. The sting and release operation is used to move the position of a sound
(a Voronoi cell), while the change operation serves to change its musical and
graphical properties.
8.6 Conclusion
In this chapter, we explored spatial presence of sounds for supporting sit-
uated collaborative work. The shared tabular sound display called Sound
Table allows multiple users to have a feeling that sounds are here and there
with the help of visual feedback on the table. A stick-type input device is
provided for manipulation of dynamic (i.e., sound and visual) objects.
Application of the proposed multimodal system to collaborative computer
music creation was also presented. Users enjoy creating music collabora-
tively through auditory, visual, and gestural interaction.
This work represents an important first step bringing multimodal, mul-
tiuser interaction to spatial sound display. There remain several open ques-
tions, however, which need to be addressed. First, more detailed experiments
in sound positioning control are needed. Second, exploration of the utility of
the system still remains. Third, we will investigate how exactly the informa-
tion is shared and how social protocols between people may evolve with the
usage of the system. Fourth, it is interesting to explore principles of good
sound visualization design.
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