Selectively activated dual tone multi-frequency detector
US5459781A · kind A · utility
30Cited by
18References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1994 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Jan 12, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/533
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A technique for improved DTMF detection utilizes a speech detector, either alone or in combination with other information from a voice processing arrangement, to adjust the sensitivity of the DTMF detector. The DTMF detector is turned completely off when the voice processing application is in the record mode, and when speech is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.