Methods and apparatus to determine a state of a media presentation device
First Claim
1. A method of determining a state of a media presentation device, the method comprising:
- generating, using an echo cancellation algorithm, a first set of weighted coefficients based on first audio received by first and second microphones at a first time;
generating, using the echo cancellation algorithm, a second set of weighted coefficients based on second audio received by the first and second microphones at a second time after the first time;
comparing the first set of weighted coefficients and the second set of weighted coefficients by calculating a dot product between the first set of weighted coefficients and the second set of weighted coefficients to generate a similarity value;
when the similarity value satisfies a first threshold, determining that the media presentation device is in a first state;
when the similarity value does not satisfy the first threshold, determining that the media presentation device is in a second state; and
controlling a metering device based on whether the media presentation device is in the first state or the second state.
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Abstract
Methods and apparatus to determine a state of a media presentation device are disclosed. Example disclosed methods include generating a first set of weighted coefficients based on first audio received by first and second microphones at a first time. Example disclosed methods include generating a second set of weighted coefficients based on second audio received by the first and second microphones at a second time after the first time. Example disclosed methods include comparing the first set of coefficients and the second set of coefficients to generate a similarity value. Example disclosed methods include, when the similarity value satisfies a threshold, determining that the media presentation device is in a first state. Example disclosed methods include, when the similarity value does not satisfy the threshold, determining that the media presentation device is in a second state.
505 Citations
20 Claims
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1. A method of determining a state of a media presentation device, the method comprising:
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generating, using an echo cancellation algorithm, a first set of weighted coefficients based on first audio received by first and second microphones at a first time; generating, using the echo cancellation algorithm, a second set of weighted coefficients based on second audio received by the first and second microphones at a second time after the first time; comparing the first set of weighted coefficients and the second set of weighted coefficients by calculating a dot product between the first set of weighted coefficients and the second set of weighted coefficients to generate a similarity value; when the similarity value satisfies a first threshold, determining that the media presentation device is in a first state; when the similarity value does not satisfy the first threshold, determining that the media presentation device is in a second state; and controlling a metering device based on whether the media presentation device is in the first state or the second state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A tangible computer readable storage medium comprising instructions that, when executed, cause a machine to at least:
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generate, using an echo cancellation algorithm, a first set of weighted coefficients based on first audio received by first and second microphones at a first time; generate, using the echo cancellation algorithm, a second set of weighted coefficients based on second audio received by the first and second microphones at a second time after the first time; compare the first set of weighted coefficients and the second set of weighted coefficients by calculating a dot product between the first set of weighted coefficients and the second set of weighted coefficients to generate a similarity value; when the similarity value satisfies a first threshold, determine that a media presentation device is in a first state; when the similarity value does not satisfy the first threshold, determine that the media presentation device is in a second state; and control a metering device based on whether the media presentation device is in the first state or the second state. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A metering device comprising a processor to implement a source detector including an adaptive audio filter, an audio comparator, and a state determiner,
the adaptive audio filter to at least: -
generate, using an echo cancellation algorithm, a first set of weighted coefficients based on first audio received by first and second microphones at a first time; and generate, using the echo cancellation algorithm, a second set of weighted coefficients based on second audio received by the first and second microphones at a second time after the first time; the audio comparator to at least; compare the first set of weighted coefficients and the second set of weighted coefficients by calculating a dot product between the first set of weighted coefficients and the second set of weighted coefficients to generate a similarity value; and the state determiner to at least; when the similarity value satisfies a first threshold, determine that the media presentation device is in a first state; when the similarity value does not satisfy the first threshold, determine that the media presentation device is in a second state; and control the metering device based on whether the media presentation device is in the first state or the second state. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification