Methods and appratus for characterizing media
First Claim
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1. An apparatus to characterize media comprising:
- a sample generator to capture a block of audio;
a transformer to convert at least a portion of the block of audio into a frequency domain representation including a plurality of complex-valued frequency components;
a decision metric computer to;
define a band of complex-valued frequency components for consideration;
determine a decision metric using the band of complex-valued frequency components by convolving a group of the complex-valued frequency components in the band with a pair of complex vectors, each of the pair of complex vectors and the group of the complex-valued frequency components having an odd number of elements greater than one; and
a signature determiner to determine a signature bit based on a value of the decision metric, wherein at least one of the decision metric computer or the signature determiner is implemented using a processor.
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Abstract
Methods and apparatus for characterizing media are described. In one example, a method of characterizing media includes capturing a block of audio; converting at least a portion of the block of audio into a frequency domain representation including a plurality of complex-valued frequency components; defining a band of complex-valued frequency components for consideration; determining a decision metric using the band of complex-valued frequency components; and determining a signature bit based on a value of the decision metric. Other examples are shown and described.
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Citations
11 Claims
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1. An apparatus to characterize media comprising:
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a sample generator to capture a block of audio; a transformer to convert at least a portion of the block of audio into a frequency domain representation including a plurality of complex-valued frequency components; a decision metric computer to; define a band of complex-valued frequency components for consideration; determine a decision metric using the band of complex-valued frequency components by convolving a group of the complex-valued frequency components in the band with a pair of complex vectors, each of the pair of complex vectors and the group of the complex-valued frequency components having an odd number of elements greater than one; and a signature determiner to determine a signature bit based on a value of the decision metric, wherein at least one of the decision metric computer or the signature determiner is implemented using a processor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus to characterize media comprising:
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a sample generator to capture a block of audio; a transformer to convert at least a portion of the block of audio into a frequency domain representation including a plurality of complex-valued frequency components; a decision metric computer comprising a processor to; define a band of complex-valued frequency components for consideration; determine a decision metric using the band of complex-valued frequency components by convolving the complex-valued frequency components in the band with complex vectors, wherein the decision metric is based on differences of results of convolutions between the complex-valued frequency components with a first complex vector and results of convolutions between the complex-valued frequency components with a second complex vector; and a signature determiner to determine a signature bit based on a value of the decision metric. - View Dependent Claims (9)
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10. A method of characterizing media comprising:
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capturing a block of audio; converting at least a portion of the block of audio into a frequency domain representation including a plurality of frequency domain coefficients; defining a band of frequency domain coefficients for consideration; determining, using a processor, a decision metric by calculating a convolution of a group of the frequency domain coefficients in the band with a pair of complex vectors, the group of the frequency domain coefficients and each of the complex vectors having an odd number of elements greater than one; and determining a signature bit based on a value of the decision metric. - View Dependent Claims (11)
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Specification