Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6650662 | Method and system for transmitting a DTMF signal with compressed voice in a packet switching network | Charles Arnaud, Gerard Richter | 2003-11-18 |
| 5619565 | Voice activity detection method and apparatus using the same | Gerard Richter | 1997-04-08 |
| 5533118 | Voice activity detection method and apparatus using the same | Gerard Richter | 1996-07-02 |
| 5495526 | Tone-detection method for detecting at least one tone in a dual-tone multifrequency signal, call-progress method using the same | Gerard Richter | 1996-02-27 |