DTMF detection for voice processing equipment
US5528663A · kind A · utility
9Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1995 |
| Grant date | Jun 18, 1996 |
| Priority date | — |
| Expiry date | Jul 26, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q1/46
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
By testing a received signal for power, frequency content, and stability, one can measurably improve DTMF signal detection and identification performance in voice store and forward systems. The algorithms described here have been found to be especially useful in minimizing talk-off. Further, the approach improves the performance with acoustic-type generators and minimizes transhybrid loss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.