Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5694466 | DTMF detector system and method which performs improved twist computation and thresholding | John G. Bartkowiak | 1997-12-02 |
| 5644634 | System and method for dual tone multifrequency detection using variable frame widths | John G. Bartkowiak | 1997-07-01 |