Methods and apparatus for generating signatures
First Claim
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1. A method, comprising:
- applying a first function to a portion of digital data to produce a first windowed block;
applying a second function different from the first function to the same portion of the digital data to produce a second windowed block;
determining a first characteristic of a band of frequencies in the first windowed block;
determining a second characteristic of the band of frequencies in the second windowed block;
comparing the first characteristic to the second characteristic; and
assigning a signature bit representative of the portion of the digital data based on the comparison of the first characteristic and the second characteristic.
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Abstract
Signaturing methods and apparatus as described. An example method includes applying a first function to a portion of digital data to produce a first windowed block, applying a second function different from the first function to the same portion of the digital data to produce a second windowed block, determining a first characteristic of a band of frequencies in the first windowed block, determining a second characteristic of the band of frequencies in the second windowed block, comparing the first characteristic to the second characteristic, and assigning a signature bit representative of the portion of the digital data based on the comparison of the first characteristic and the second characteristic.
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Citations
15 Claims
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1. A method, comprising:
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applying a first function to a portion of digital data to produce a first windowed block; applying a second function different from the first function to the same portion of the digital data to produce a second windowed block; determining a first characteristic of a band of frequencies in the first windowed block; determining a second characteristic of the band of frequencies in the second windowed block; comparing the first characteristic to the second characteristic; and assigning a signature bit representative of the portion of the digital data based on the comparison of the first characteristic and the second characteristic. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus to generate a signature representing digital data, the apparatus comprising:
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a windower to apply a first window function to a portion of digital data to produce a first windowed block and to apply a second window function to the portion of the digital data to produce a second windowed block; a characteristic determiner to determine a first characteristic of a band of frequencies in the first windowed block and to determine a second characteristic of the band of frequencies in the second windowed block; a comparator to compare the first characteristic to the second characteristic; and a signature determiner to assign a signature bit representative of the portion of the digital data based on the comparison of the first characteristic and the second characteristic, at least one of the windower, the characteristic determiner, the comparator, or the signature determiner being implemented using a processor. - View Dependent Claims (7, 8, 9, 10)
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11. A computer readable storage medium, excluding propagating signals, comprising computer readable instructions which, when executed, cause a processor to at least:
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apply a first function to a portion of digital data to produce a first windowed block; apply a second function different from the first function to the same portion of the digital data to produce a second windowed block; determine a first characteristic of a band of frequencies in the first windowed block; determine a second characteristic of the band of frequencies in the second windowed block; compare the first characteristic to the second characteristic; and assign a signature bit representative of the portion of the digital data based on the comparison of the first characteristic and the second characteristic. - View Dependent Claims (12, 13, 14, 15)
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Specification