Display device on/off detection methods and apparatus
US9420334B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2013 |
| Grant date | Aug 16, 2016 |
| Priority date | — |
| Expiry date | Oct 16, 2034 |
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 methods disclosed herein include performing audio code detection on an audio signal corresponding to an output of a presentation device. Such disclosed example methods also include determining a first result based on whether a valid audio code is detected in the audio signal, and determining a second result based on an audio gain level used to adjust the audio signal prior to performing audio code detection on the audio signal. Such disclosed example methods further include combining the first result and the second result to determine a third result indicating whether the presentation device is ON or OFF.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.