Detecting dial tone on a telephone line
US9503568B1 · kind B1 · utility
2Cited by
37References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2016 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Jun 30, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2201/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method to detect dial tone on a telephone line may include taking samples of incoming audio on a telephone line. The method may also include determining volumes of the samples. The method may further include determining whether the volumes of a threshold number of the samples are at or above a threshold volume. The method may also include, in response to determining that the volumes of a threshold number of the samples are at or above a threshold volume, determining that the incoming audio on the telephone line includes a dial tone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.