Prof. Arai was awarded a patent for vocal tract model1). Prof. Arai’s research team were also awarded a patent for sound masking system2).
The details are below.
1)
Title of the invention: Vocal tract model
Patent number: No. 6364190
2)
Title of the invention: Sound masking system, method, and program
Patent number: No. 6349112
You can find details about vocal tract model here.
(Updated on September 18th 2019)