Methods and apparatus to perform audio watermarking and watermark detection and extraction
AssigneeThe Nielsen Company (US), LLC
InventorsVenugopal Srinivasan, Alexander Pavlovich Topchy
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Abstract
Example methods and apparatus to audio watermarking and watermark detection and extraction are disclosed herein. Example methods disclosed herein include determining a first watermark symbol encoded in encoded audio samples and storing the first watermark symbol in tangible memory. Disclosed example methods also include determining a second watermark symbol encoded in the encoded audio samples and storing the second watermark symbol in the tangible memory. Disclosed example methods further include, in response to determining that the first watermark symbol matches the second watermark symbol, outputting the first watermark symbol.
Claims19
An apparatus to transform media into a message, the apparatus comprising:
- a max score selector to:
- decode a first watermark symbol from a plurality of audio samples;
- store the first decoded watermark symbol in tangible memory;
- decode a second watermark symbol from the plurality of audio samples;
- and
- store the second decoded watermark symbol in the tangible memory;
- and
- a validator to:
- determine that a first condition is satisfied when the first decoded watermark symbol matches the second decoded watermark symbol;
- determine that a second condition is satisfied when a number of audio samples between a first one of the plurality of audio samples associated with a start of the first decoded watermark symbol and a second one of the plurality of audio samples associated with a start of the second decoded watermark symbol corresponds to a time duration that is a multiple of a period corresponding to a watermark symbol encoding repetition rate;
- and
- output the first decoded watermark symbol in response to a determination that the first condition and the second condition are satisfied.
A computer readable storage disk or storage device comprising instructions that, when executed, cause a processor to at least:
- decode a first watermark symbol from a plurality of audio samples;
- store the first decoded watermark symbol in tangible memory;
- decode a second watermark symbol from the plurality of audio samples;
- store the second decoded watermark symbol in the tangible memory;
- determine that a first condition is satisfied when the first decoded watermark symbol matches the second decoded watermark symbol;
- determine that a second condition is satisfied when a number of audio samples between a first one of the plurality of audio samples associated with a start of the first decoded watermark symbol and a second one of the plurality of audio samples associated with a start of the second decoded watermark symbol corresponds to a time duration that is a multiple of a period corresponding to a watermark symbol encoding repetition rate;
- and
- output the first decoded watermark symbol in response to a determination that the first condition and the second condition are satisfied.
A method to transform media into a message, the method comprising:
- decoding, by executing an instruction with a processor, a first watermark symbol from a plurality of audio samples;
- storing the first decoded watermark symbol in tangible memory;
- decoding, by executing the instruction with the processor, a second watermark symbol from the plurality of audio samples;
- storing the second decoded watermark symbol in the tangible memory;
- determining that a first condition is satisfied when the first decoded watermark symbol matches the second decoded watermark symbol;
- determining that a second condition is satisfied when a number of audio samples between a first one of the plurality of audio samples associated with a start of the first decoded watermark symbol and a second one of the plurality of audio samples associated with a start of the second decoded watermark symbol corresponds to a time duration that is a multiple of a period corresponding to a watermark symbol encoding repetition rate;
- and
- outputting the first decoded watermark symbol in response to a determination that the first condition and the second condition are satisfied.
Dependencies are inferred from the claim text.