Method and apparatus for reducing false ringback detection
US6154537A · kind A · utility
1Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 4, 1998 |
| Grant date | Nov 28, 2000 |
| Priority date | — |
| Expiry date | May 4, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/724
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a communication device, a decoded audio signal is evaluated by a detection function (112). Two portions of the decoded audio signal spectrum are evaluated, a ringback band (206), and the remaining band(s). The signal strength in the ringback band is measured against a preselected ringback energy threshold level and the non-ringback signal strength is measured against a voice energy threshold level. Only if the ringback energy is above the ringback energy threshold level and the non-ringback band energy is below the voice energy threshold level will a ringback filter be applied to the audio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.