Linear predictive coding implementation of digital watermarks
First Claim
1. A system for detecting at least one digital watermark from a content signal, comprisinga) a receiver for receiving a content signal;
- b) a processor for processing linear predictive coding calculations to identify signal components of said content signal, said signal components being characterized by at least one of the following groups;
i) a discrete series of digital samples, andii) a discrete series of carrier frequency sub-bands of the content signal; and
c) a detector for detecting the at least one digital watermark from the signal components of the content signal.
2 Assignments
0 Petitions
Accused Products
Abstract
Z-transform calculations may be used to encode (and/or decode) carrier signal independent data (e.g., digital watermarks) to a digital sample stream. Deterministic and non-deterministic components of a digital sample stream signal may be analyzed for the purposes of encoding carrier signal independent data to the digital sample stream. The carrier signal independent data may be encoded in a manner such that it is restricted or concentrated primarily in the non-deterministic signal components of the carrier signal. The signal components can include a discrete series of digital samples and/or a discreet series of carrier frequency sub-bands of the carrier signal. Z-transform calculations may be used to measure a desirability of particular locations and a sample stream in which to encode the carrier signal independent data.
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Citations
20 Claims
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1. A system for detecting at least one digital watermark from a content signal, comprising
a) a receiver for receiving a content signal; -
b) a processor for processing linear predictive coding calculations to identify signal components of said content signal, said signal components being characterized by at least one of the following groups; i) a discrete series of digital samples, and ii) a discrete series of carrier frequency sub-bands of the content signal; and c) a detector for detecting the at least one digital watermark from the signal components of the content signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for detecting a digital watermark from a content signal, comprising
a) a receiver for receiving a content signal; -
b) a processor for processing linear predictive coding calculations to identify predictable and unpredictable components of said content signal, said predictable signal components being characterized by at least one of the following group; i) a discrete series of digital samples, and ii) a discrete series of carrier frequency sub-bands of the content signal; and c) extracting the digital watermark from the unpredictable signal components of the content signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A system of using linear predictive coding calculations to measure the desirability of particular locations in a sample stream in which to encode content signal independent data, including a digital watermark, comprising:
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a receiver for receiving a sample stream; a processor for processing linear predictive coding calculations to identify locations in said sample stream which would be desirable for encoding content signal independent data; and an encoder for encoding said content signal independent data into said identified locations in said sample stream to produce an embedded sample stream. - View Dependent Claims (19, 20)
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Specification