IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0341092
(2011-12-30)
|
등록번호 |
US-8554545
(2013-10-08)
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발명자
/ 주소 |
- Srinivasan, Venugopal
- Topchy, Alexander Pavlovich
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출원인 / 주소 |
- The Nielsen Company (US), LLC
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대리인 / 주소 |
Hanley, Flight & Zimmerman LLC
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인용정보 |
피인용 횟수 :
2 인용 특허 :
138 |
초록
▼
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 d
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.
대표청구항
▼
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;determin
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; andstoring the information in a memory device. 2. A method as defined in claim 1, wherein the first rank indicates an amplitude of the first frequency relative to other frequencies in a neighborhood. 3. A method as defined in claim 2, wherein a number of frequencies in the neighborhood is equal to a number of possible rank values. 4. A method as defined in claim 1, further comprising 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. 5. A method to extract information from media, the method comprising: 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; andstoring 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. 6. An apparatus to extract information from media content, the apparatus comprising: 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; anda 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. 7. An apparatus as defined in claim 6, wherein the first rank indicates an amplitude of the first frequency relative to other frequencies in a neighborhood. 8. An apparatus as defined in claim 7, wherein a number of frequencies in the neighborhood is equal to a number of possible rank values. 9. An apparatus as defined in claim 6, further comprising 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. 10. An apparatus to extract information from media, the apparatus comprising: 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; anda 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. 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: 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; anddetermining 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. 12. A computer readable medium as defined in claim 11, wherein the first rank indicates an amplitude of the first frequency relative to other frequencies in a neighborhood. 13. A computer readable medium as defined in claim 12, wherein a number of frequencies in the neighborhood is equal to a number of possible rank values. 14. A computer readable medium as defined in claim 11, wherein the instructions cause the machine to determine 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. 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: 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; anddetermining 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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