Methods and apparatus to monitor audio/visual content from various sources
First Claim
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1. A method to monitor a media presentation, the method comprising:
- counting zero crossings associated with a plurality of audio samples of an audio signal corresponding to the media presentation;
determining whether the audio signal is muted based on whether a number of zero crossings satisfies a first threshold; and
when the audio signal is determined to not be muted;
generating a plurality of transform coefficients associated with the plurality of audio samples;
examining a subset of the plurality of transform coefficients corresponding to a frequency range exceeding a threshold frequency;
determining whether the audio signal is compressed based on a number of transform coefficients substantially equal to zero in the subset of the plurality of transform coefficients; and
determining a source of the media presentation based on whether the audio signal is determined to be compressed.
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Abstract
Methods and apparatus to monitor audio/visual content from various sources are disclosed. Example methods disclosed herein to monitor a media presentation can include counting zero crossings associated with a plurality of audio samples of an audio signal corresponding to the media presentation, and determining whether the audio signal is muted based on whether a number of zero crossings satisfies a first threshold. Such example methods can also include, when the audio signal is determined to not be muted, determining a source of the media presentation based on whether the audio signal is determined to be compressed.
158 Citations
20 Claims
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1. A method to monitor a media presentation, the method comprising:
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counting zero crossings associated with a plurality of audio samples of an audio signal corresponding to the media presentation; determining whether the audio signal is muted based on whether a number of zero crossings satisfies a first threshold; and when the audio signal is determined to not be muted; generating a plurality of transform coefficients associated with the plurality of audio samples; examining a subset of the plurality of transform coefficients corresponding to a frequency range exceeding a threshold frequency; determining whether the audio signal is compressed based on a number of transform coefficients substantially equal to zero in the subset of the plurality of transform coefficients; and determining a source of the media presentation based on whether the audio signal is determined to be compressed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A tangible machine readable storage device or storage disk comprising machine readable instructions which, when executed, cause a machine to at least:
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count zero crossings associated with a plurality of audio samples of an audio signal corresponding to a media presentation; determine whether the audio signal is muted based on a whether a number of zero crossings satisfies a first threshold; and when the audio signal is determined to not be muted; generate a plurality of transform coefficients associated with the plurality of audio samples; examine a subset of the plurality of transform coefficients corresponding to a frequency range exceeding a threshold frequency; determine whether the audio signal is compressed based on a number of transform coefficients substantially equal to zero in the subset of the plurality of transform coefficients; and determine a source of the media presentation based on whether the audio signal is determined to be compressed. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus to monitor a media presentation, the apparatus comprising:
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a volume and mute detector to; count zero crossings associated with a plurality of audio samples of an audio signal corresponding to the media presentation; and determine whether the audio signal is muted based on whether a number of zero crossings satisfies a first threshold; and a compression detector to, when the audio signal is determined to not be muted; generate a plurality of transform coefficients associated with the plurality of audio samples; examine a subset of the plurality of transform coefficients corresponding to a frequency range exceeding a threshold frequency; determine whether the audio signal is compressed based on a number of transform coefficients substantially equal to zero in the subset of the plurality of transform coefficients; and determine a source of the media presentation based on whether the audio signal is determined to be compressed. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification