Back to results
US 7,599,604 B2Granted
Asynchronous copy protection detector
AssigneeThomson Licensing
InventorsMark Francis Rumreich, John Alan Hague
Life of this patent
Estimating the term…
Abstract
A video system (100) includes detection circuitry (200A-200C) operative to detect pseudo-synchronization pulses within a composite synchronization signal in dependence upon at least one timing signal. Timing circuitry (200D-200F) is operative to generate the at least one timing signal without utilizing synchronization information within the composite synchronization signal.
Claims18
A video system, comprising:
- detection circuitry operative to detect pseudo-synchronization pulses associated with a copy protection scheme within a composite synchronization signal in dependence upon at least two timing signals,
- wherein detection of said pseudo-synchronization pulses associated with a copy protection scheme by said detection circuitry is independent of timing signals generated utilizing synchronization information within the composite synchronization signal, and
- wherein said detection circuitry comprises circuitry to:
- subsample said composite synchronization signal to create a subsampled signal;
- perform matched filtering on said subsampled signal;
- and further process said matched filtered subsampled signal using said at least two timing signals to generate a signal indicating the presence of said pseudo-synchronization pulses associated with a copy protection scheme;
- and
- timing circuitry operative to generate the at least two timing signals;
- wherein the at least two timing signals are generated independently of said synchronization information within the composite synchronization signal.
6 more elements
An asynchronous detector, comprising:
- detecting means for detecting pseudo-synchronization pulses associated with a copy protection scheme within a composite synchronization signal in dependence upon at least two timing signals, wherein detection of said pseudo-synchronization pulses associated with a copy protection scheme by said detecting means is independent of timing signals generated utilizing synchronization information within the composite synchronization signal, and wherein said detecting means comprises:
- means for subsampling said composite synchronization signal to create a subsampled signal;
- means for performing matched filtering on said subsampled signal;
- and means for further processing said matched filtered subsampled signal using said at least two timing signals to generate a signal indicating the presence of said pseudo-synchronization pulses associated with a copy protection scheme;
- and
- means for generating the at least two timing signals;
- wherein the at least two timing signals are generated independently of said synchronization information within the composite synchronization signal.
4 more elements
A method for asynchronously detecting a copy protection scheme in a video system, comprising steps of:
- detecting pseudo-synchronization pulses associated with the copy protection scheme within a composite synchronization signal in dependence upon at least two timing signals, wherein detection of said pseudo-synchronization pulses associated with a copy protection scheme by said detection circuitry is independent of timing signals generated utilizing synchronization information within the composite synchronization signal, and wherein said detecting comprises:
- subsampling said composite synchronization signal to create a subsampled signal;
- performing matched filtering on said subsampled signal;
- and further processing said matched filtered subsampled signal using said at least two timing signals to generate a signal indicating the presence of said pseudo-synchronization pulses associated with a copy protection scheme;
- and
- generating the at least two timing signals independently of said synchronization information within the composite synchronization signal.
3 more elements
Dependencies are inferred from the claim text.