Communication apparatus, communication method, and storage medium storing program
US9167128B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 2014 |
| Grant date | Oct 20, 2015 |
| Priority date | — |
| Expiry date | Jul 29, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/32715
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus to which a telephone line can be connected, the apparatus comprising: a first determination unit configured to determine, based on a change amount of a line direct-current voltage from the telephone line per time period, whether the line direct-current voltage is stable; a second determination unit configured to determine whether the line direct-current voltage from the telephone line is a first threshold or lower; and a third determination unit configured to, if the first determination unit determines that the line direct-current voltage is stable and if the second determination unit determines that the line direct-current voltage is the first threshold or lower, determine that the external telephone has captured the telephone line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.