Display device on/off detection methods and apparatus
US10306221B2 · kind B2 · utility
9Cited by
113References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2018 |
| Grant date | May 28, 2019 |
| Priority date | — |
| Expiry date | Oct 22, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4394
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Display device ON/OFF detection methods and apparatus are disclosed. Example metering apparatus disclosed herein include a current detector to measure an electrical current drawn by a monitored media device from a power source, and an audio sensor. Disclosed example metering apparatus also include a processor to compare the electrical current to a first threshold and to compare a level associated with audio sensed by the audio sensor to a second threshold to determine whether the monitored media device is ON or OFF.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.