  We introduce real-time and interactive tools for assisting vocal training. In
this presentation, we demonstrate mainly a tool based on real-time visualizer
of fundamental frequency candidates to provide information-rich feedback to
learners. The visualizer uses an efficient algorithm using analytic signals for
deriving phase-based attributes. We start using these tools in vocal training
for assisting learners to acquire the awareness of appropriate vocalization.
The first author made the MATLAB implementation of the tools open-source. The
code and associated video materials are accessible in the first author's GitHub
repository.
