Display device ON/OFF detection methods and apparatus
First Claim
Patent Images
1. A metering apparatus comprising:
- first means for sensing an audio signal output from a media device;
second means for performing audio code detection to detect audio codes in the audio signal;
third means for determining an audio gain level applied to the audio signal; and
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.
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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.
183 Citations
20 Claims
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1. A metering apparatus comprising:
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first means for sensing an audio signal output from a media device; second means for performing audio code detection to detect audio codes in the audio signal; third means for determining an audio gain level applied to the audio signal; and 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A metering apparatus comprising:
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first sensor means for sensing a first temperature value associated with the media device, the first sensor means to be attached or positioned proximate to the media device; second sensor means for sensing an ambient temperature in an environment including the media device, the second sensor means to be positioned away from the media device in the environment; and means for comparing the first temperature value to the second temperature value based on a threshold to determine whether the media device is ON or OFF. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A metering apparatus comprising:
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first means for sensing an audio signal output from a media device; second means for performing audio signature generation to generate audio signatures from the audio signal; third means for determining an audio gain level applied to the audio signal; and 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 at least one of the audio signatures is determined to match a reference signature. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification