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Figure 16: Message in normal voice.
Figure 17: Message in loud voice.
Figure 18: Message in weak voice.
3.4
Putting Real-time Real World Aspects in IBNR
In the first prototype of the invisible person system described in section 2, there
are several serious problems. First, the construction of virtual space based on real
space has a high cost. Second, visiting such a virtual space on WWW also takes a
lot of transmission, rendering, and management, especially when it is very large or
elaborated. Third, it is difficult to reflect the situation in the real space on the
virtual space in real-time. The first two problems can be solved by introducing the
IBNR multi-user version. Thus, a simple way to solve the problems is to extend
IBNR to manage the third problem, i.e., to put real-time, real world aspects.
This can be easily done by using video images instead of scenic images. In this
case, virtual space that simulates things in real time which occur in the real space
can be constructed. At the implementation level, the simplest way for using real-
time video in WWW is to use 'meta' tags for refreshing the page in a short period
of time, possibly every few seconds. If more frequent refreshing is needed, several
real-time video streaming technologies can be used, and they generally request
plug-ins of WWW browsers. We have implemented the IBNR version of IPH for
the invisible person system. It is constructed using the former method, and the
