Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6683960 | Active noise control apparatus | Kensaku Fujii | 2004-01-27 |
| 5940499 | Voice switch used in hands-free communications system | Kensaku Fujii, Hiroyuki Masuda | 1999-08-17 |
| 5790440 | Apparatus for estimating filter coefficients | Kensaku Fujii | 1998-08-04 |
| 5638311 | Filter coefficient estimation apparatus | Kensaku Fujii | 1997-06-10 |
| 5602926 | Method and apparatus of determining the sound transfer characteristic of an active noise control system | Tadashi Ohashi, Kensaku Fujii | 1997-02-11 |
| 5544201 | Signal suppressing apparatus | Tsutomu Hoshino, Atsushi Yamaguchi, Tadashi Ohashi, Hiroyuki Furuya | 1996-08-06 |
| 5479502 | Speaking apparatus having handfree conversation function | Hiroyuki Masuda, Kensaku Fujii, Yoshihiro Sakai | 1995-12-26 |
| 5384843 | Hands-free telephone set | Hiroyuki Masuda, Kazutoshi Hosokawa, Kensaku Fujii | 1995-01-24 |
| 5237562 | Echo path transition detection | Kensaku Fujii, Hiroyuki Masuda, Yoshihiro Sakai | 1993-08-17 |
| 5146470 | Adaptive digital filter including low-pass filter | Kensaku Fujii, Hiroyuki Masuda | 1992-09-08 |
| 4908855 | Electronic telephone terminal having noise suppression function | Kensaku Fujii, Hiroyuki Masuda, Yuka Sato | 1990-03-13 |
| 4683590 | Inverse control system | Masato Miyoshi, Yutaka Kaneda | 1987-07-28 |
| 4536887 | Microphone-array apparatus and method for extracting desired signal | Yutaka Kaneda | 1985-08-20 |