  Metaverse provides an alternative platform for human interaction in the
virtual world. Since virtual platform holds few restrictions in changing the
surrounding environments or the appearance of the avatars, it can serve as a
platform that reflects human thoughts or even dreams at least in the metaverse
world. When it is merged together with the current brain-computer interface
(BCI) technology, which enables system control via brain signals, a new
paradigm of human interaction through mind may be established in the metaverse
conditions. Recent BCI systems are aiming to provide user-friendly and
intuitive means of communication using brain signals. Imagined speech has
become an alternative neuro-paradigm for communicative BCI since it relies
directly on a person's speech production process, rather than using
speech-unrelated neural activity as the means of communication. In this paper,
we propose a brain-to-speech (BTS) system for real-world smart communication
using brain signals. Also, we show a demonstration of imagined speech based
smart home control through communication with a virtual assistant, which can be
one of the future applications of brain-metaverse system. We performed
pseudo-online analysis using imagined speech electroencephalography data of
nine subjects to investigate the potential use of virtual BTS system in the
real-world. Average accuracy of 46.54 % (chance level = 7.7 %) and 75.56 %
(chance level = 50 %) was acquired in the thirteen-class and binary
pseudo-online analysis, respectively. Our results support the potential of
imagined speech based smart communication to be applied in the metaverse world.
