Method and system for detecting weak or invalid signals in data streams
AssigneeThomson Licensing
InventorsJanghwan Lee, Charles Worrell
Life of this patent
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Abstract
There is provided a method for detecting signal conditions for Motion Picture Experts Group (MPEG) streams. Alternate-mode flags and valid frames within the MPEG streams are detected within a pre-defined search window. An indication that a valid signal is detected is output, when an alternate-mode flag and at least one valid frame are both detected within a same one of the predefined search window.
Claims24
A method for detecting signal conditions for a compressed information stream, comprising the steps of:
- detecting, within a pre-defined search window, alternate-mode conditions and valid frames within the compressed information stream;
- and
- outputting an indication that a valid signal is detected, when an alternate-mode condition and at least one valid frame are both detected within a same one of the predefined search window.
A method for detecting signal conditions for trick mode Motion Picture Experts Group (MPEG) streams, comprising the steps of:
- detecting, within a predefined search window, trick mode flags and valid frames within the trick mode MPEG streams;
- and
- outputting an indication that a valid signal is detected, when a trick mode flag and a valid frame are both detected within a same one of the predefined search window.
An apparatus for detecting signal conditions for a compressed information stream, comprising:
- means for detecting, within a pre-defined search window, alternate-mode conditions and valid frames within the compressed information stream;
- and
- means for outputting an indication that a valid signal is detected, when an alternate-mode condition and at least one valid frame are both detected within a same one of the predefined search window.
Dependencies are inferred from the claim text.