Display device ON/OFF detection methods and apparatus
US10110889B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2018 |
| Grant date | Oct 23, 2018 |
| Priority date | — |
| Expiry date | Apr 20, 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 first means for sensing an audio signal output from a media device. Disclosed example metering apparatus also include second means for performing audio code detection to detect audio codes in the audio signal, and third means for determining an audio gain level applied to the audio signal. Disclosed example metering apparatus further include fourth means for determining whether the media device is ON or OFF based on the audio gain level applied to the audio signal and whether a valid audio code is detected in the audio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.