Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6088440 | Method and apparatus for operating a telephone exchange having selectable audio sources | Robert B. Carpenter | 2000-07-11 |
| 5146503 | Speech recognition | Ian R. Cameron | 1992-09-08 |
| 4947436 | Speaker verification using memory address | Alan J. Greaves | 1990-08-07 |
| 4896356 | Sub-band coders, decoders and filters | — | 1990-01-23 |
| 4823296 | First order digital filter with controlled boost/truncate quantizer | — | 1989-04-18 |
| 4729112 | Digital sub-band filters | — | 1988-03-01 |