US Patent Issued to NTT on June 16 for "Waveguide estimation apparatus, waveguide estimation method and program" (Japanese Inventors)

ALEXANDRIA, Va., June 16 -- United States Patent no. 12,659,029, issued on June 16, was assigned to NTT Inc. (Tokyo).

"Waveguide estimation apparatus, waveguide estimation method and program" was invented by Akira Kawai (Musashino, Japan), Takayuki Kobayashi (Musashino, Japan), Masanori Nakamura (Musashino, Japan), Shimpei Shimizu (Musashino, Japan) and Yutaka Miyamoto (Musashino, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A waveguide estimation device includes: a time window processing unit that multiplies time-series tap coefficients of an adaptive filter by a time window function; and an estimation unit that estimates at least one of a differential group delay in a frequency series or a time ser...