DIGITAL SIGNATURES
First Claim
1. A digital signature generation apparatus comprising:
- a polarizer operable to produce a two-state signal having a bit sequence providing a binary representation of a sampled data segment;
an event detector operable to identify at least one event in the sampled data segment or in the two-state signal; and
a signature generator operable, on the basis of a predetermined signature collection pattern specifying a plurality of offsets from an identified event to select the values of the respective bits of the bit sequence at the bit positions specified by the offsets, and on the basis of those values to provide a digital signature characteristic of the sampled data segment.
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Accused Products
Abstract
Method and apparatus for generating a digital signature are provided. The method comprises:—polarizing a sampled data segment, for example a sampled audio segment, to produce a two-state signal having a bit sequence providing a binary representation of the sampled data segment, detecting an event in the signal, the event corresponding to occurrence of a predetermined pattern in the bit sequence of the signal, selecting, on the basis of a predetermined signature collection pattern specifying a plurality of offsets from the detected event, the values of the respective bits of the bit sequence at the bit positions specified by the offsets, and on the basis of those values providing a digital signature characteristic of the sampled data segment. Related systems are also provided.
60 Citations
49 Claims
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1. A digital signature generation apparatus comprising:
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a polarizer operable to produce a two-state signal having a bit sequence providing a binary representation of a sampled data segment;
an event detector operable to identify at least one event in the sampled data segment or in the two-state signal; and
a signature generator operable, on the basis of a predetermined signature collection pattern specifying a plurality of offsets from an identified event to select the values of the respective bits of the bit sequence at the bit positions specified by the offsets, and on the basis of those values to provide a digital signature characteristic of the sampled data segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of generating a digital audio signature comprising:
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polarizing a sampled data segment to produce a two-state signal having a bit sequence providing a binary representation of the sampled data segment;
detecting an event in the sampled data segment or in the two-state signal; and
selecting, on the basis of a predetermined signature collection pattern specifying a plurality of offsets from the detected event, the values of the respective bits of the bit sequence at the bit positions specified by the offsets, and on the basis of those values providing a digital signature characteristic of the sampled data segment. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A computer-readable medium having computer-executable instructions that when executed perform a method of generating a digital audio signature comprising:
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polarizing a sampled data segment to produce a two-state signal having a bit sequence providing a binary representation of the sampled data segment;
detecting an event in the sampled data segment or in the two-state signal; and
selecting, on the basis of a predetermined signature collection pattern specifying a plurality of offsets from the detected event, the values of the respective bits of the bit sequence at the bit positions specified by the offsets, and on the basis of those values providing a digital signature characteristic of the sampled data segment.
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36. A system comprising:
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a database comprising digital signatures generated by a method comprising;
(a) polarizing a sampled data segment to produce a two-state signal having a bit sequence providing a binary representation of the sampled data segment;
(b) detecting an event in the sampled data segment or in the two-state signal; and
(c) selecting, on the basis of a predetermined signature collection pattern specifying a plurality of offsets from the detected event, the values of the respective bits of the bit sequence at the bit positions specified by the offsets, and on the basis of those values providing a digital signature characteristic of the sampled data segment; and
a means for comparing a further digital signature, also generated by steps (a), (b), and (c), with digital signatures of the database, to seek a match between said further digital signature and a digital signature of the database. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 49)
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47. An audience measurement system comprising:
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in one or more households, household entertainment equipment being a program source configured to produce audio signals; and
an apparatus configured to generate digital audio signatures of sampled audio segments derived from the audio signals, the apparatus comprising;
a polarizer operable to produce a two-state signal having a bit sequence providing a binary representation of a sampled data segment;
an event detector operable to identify at least one event in the sampled data segment or in the two-state signal; and
a signature generator operable, on the basis of a predetermined signature collection pattern specifying a plurality of offsets from an individual event to select the values of the respective bits of the bit sequence at the bit positions specified by the offsets, and on the basis of those values to provide a digital signature characteristic of the sampled data segment.
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Specification