Methods and apparatus to extract data encoded in media content
First Claim
1. A method to extract information from media content, the method comprising:
- sampling a media content signal to generate digital samples;
determining a frequency domain representation of the digital samples;
determining a first rank of a first frequency in the frequency domain representation;
determining a second rank of a second frequency in the frequency domain representation;
combining, via a processor, the first rank and the second rank with a set of ranks to create a combined set of ranks;
comparing the combined set of ranks to a set of reference sequences including determining a set of distances between the combined set of ranks and one or more of the sequences in the reference set of sequences;
determining information represented by the combined set of ranks based on the comparison, wherein determining the information represented by the combined set of ranks includes selecting a sequence in the reference set of sequences that has a smallest distance; and
storing the information in a memory device.
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Accused Products
Abstract
Methods and apparatus to extract data encoded in media content are disclosed. An example method includes sampling a media content signal to generate digital samples, determining a frequency domain representation of the digital samples, determining a first rank of a first frequency in the frequency domain representation, determining a second rank of a second frequency in the frequency domain representation, combining the first rank and the second rank with a set of ranks to create a combined set of ranks, comparing the combined set of ranks to a set of reference sequences, determining a data represented by the combined set of ranks based on the comparison, and storing the data in a memory device.
269 Citations
15 Claims
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1. A method to extract information from media content, the method comprising:
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sampling a media content signal to generate digital samples; determining a frequency domain representation of the digital samples; determining a first rank of a first frequency in the frequency domain representation; determining a second rank of a second frequency in the frequency domain representation; combining, via a processor, the first rank and the second rank with a set of ranks to create a combined set of ranks; comparing the combined set of ranks to a set of reference sequences including determining a set of distances between the combined set of ranks and one or more of the sequences in the reference set of sequences; determining information represented by the combined set of ranks based on the comparison, wherein determining the information represented by the combined set of ranks includes selecting a sequence in the reference set of sequences that has a smallest distance; and storing the information in a memory device. - View Dependent Claims (2, 3, 4)
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5. A method to extract information from media, the method comprising:
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sampling a media signal to generate digital samples; determining a frequency domain representation of the digital samples; determining a first rank of a first frequency in the frequency domain representation; determining a second rank of a second frequency in the frequency domain representation; combining, via a processor, the first rank and the second rank with a set of ranks to create a combined set of ranks; determining a first average rank for the first frequency in the frequency domain representation and determining a second average rank for the second frequency in the frequency domain representation; comparing the combined set of ranks to a set of reference sequences; determining information represented by the combined set of ranks based on the comparison; and storing the information in a memory device, wherein the information is repeated in the media signal after T seconds and wherein determining the first average rank for the first frequency comprises determining a third rank for the first frequency approximately T seconds before determining the first rank and adding the first rank and the third rank.
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6. An apparatus to extract information from media content, the apparatus comprising:
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a sampler to sample a media signal to generate digital samples; a time domain to frequency domain converter to determine a frequency domain representation of the digital samples; a ranker to determine a first rank of a first frequency in the frequency domain representation and to determine a second rank of a second frequency in the frequency domain representation; and a comparator to combine the first rank and the second rank with a set of ranks to create a combined set of ranks, to compare the combined set of ranks to a set of reference sequences, and to determine information represented by the combined set of ranks based on the comparison by determining a set of distances between the combined set of ranks and one or more of the sequences in the reference set of sequences and selecting a sequence in the reference set of sequences that has the smallest distance. - View Dependent Claims (7, 8, 9)
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10. An apparatus to extract information from media, the apparatus comprising:
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a sampler to sample a media signal to generate digital samples; a time domain to frequency domain converter to determine a frequency domain representation of the digital samples; a ranker to determine a first rank of a first frequency in the frequency domain representation and to determine a second rank of a second frequency in the frequency domain representation; a comparator to combine the first rank and the second rank with a set of ranks to create a combined set of ranks, to compare the combined set of ranks to a set of reference sequences, and to determine information represented by the combined set of ranks based on the comparison; and a stacker to determine a first average rank for the first frequency in the frequency domain representation and to determine a second average rank for the second frequency in the frequency domain representation, wherein the information is repeated in the media signal after T seconds and wherein the stacker is to determine the first average rank for the first frequency by determining a third rank for the first frequency approximately T seconds before determining the first rank and by adding the first rank and the third rank.
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11. A tangible computer readable medium excluding propagating signals and storing instructions that, when executed, cause a machine to extract information from media by at least:
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sampling a media signal to generate digital samples; determining a frequency domain representation of the digital samples; determining a first rank of a first frequency in the frequency domain representation; determining a second rank of a second frequency in the frequency domain representation; combining the first rank and the second rank with a set of ranks to create a combined set of ranks; comparing the combined set of ranks to a set of reference sequences by determining a set of distances between the combined set of ranks and one or more of the sequences in the reference set of sequences; and determining information represented by the combined set of ranks based on the comparison, wherein determining the information represented by the combined set of ranks includes selecting a sequence in the reference set of sequences that has the smallest distance. - View Dependent Claims (12, 13, 14)
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15. A tangible computer readable medium excluding propagating signals and storing instructions that, when executed, cause a machine to extract information from media by at least:
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sampling a media signal to generate digital samples; determining a frequency domain representation of the digital samples; determining a first rank of a first frequency in the frequency domain representation; determining a second rank of a second frequency in the frequency domain representation; combining the first rank and the second rank with a set of ranks to create a combined set of ranks; determining a first average rank for the first frequency in the frequency domain representation and determine a second average rank for the second frequency in the frequency domain representation; comparing the combined set of ranks to a set of reference sequences; and determining information represented by the combined set of ranks based on the comparison, wherein the information is repeated in the media signal after T seconds and wherein the instructions cause the machine to determine a first average rank for the first frequency by determining a third rank for the first frequency approximately T seconds before determining the first rank and adding the first rank and the third rank.
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Specification