Source device detection
US10038936B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2017 |
| Grant date | Jul 31, 2018 |
| Priority date | — |
| Expiry date | Jan 4, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/43635
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods, systems, and apparatuses are described for source device detection. Source device detection may be performed for a variety of types of connectors such as cables or board/substrate connectors across which a DC voltage or stable presence signal is normally supplied during connections when the power signal of the connector is not present. An alternating power source is coupled to a capacitor of known capacitance via a switch. The capacitor is in series with an effective capacitance of a sink device, a connector, and a source device. When the switch is open, the voltage between the capacitor and the effective capacitor is read to determine if a source device is present and On, and when closed, if the source device is present and Off or in Stand-By, or not present. The methods, systems, and apparatuses described include tunability for the capacitor based on temperature and effective capacitance variations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.