Communication apparatus
US8718248B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2012 |
| Grant date | May 6, 2014 |
| Priority date | — |
| Expiry date | Aug 31, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/007
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication apparatus, which is connected to a phone line, and to which an external telephone is connectable to. The communication apparatus includes: a line-voltage detecting unit which detects a line voltage; a communication-signal detecting unit which performs detection on a communication signal, which is input to the communication apparatus from the phone line or from the external telephone upon the external telephone is hooked up; and a control device which performs a hook-up determining process of determining that the external telephone is in a hook-up state when the line voltage detected by the line-voltage detecting unit is equal to or less than a first threshold value and the communication signal is detected by the communication-signal detecting unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.