Interactive video distribution systems – Video distribution system with upstream communication – Having link to external network
Reexamination Certificate
2003-04-04
2008-12-23
Grant, Christopher (Department: 2623)
Interactive video distribution systems
Video distribution system with upstream communication
Having link to external network
C725S131000, C348S193000, C375S326000, C375S340000, C370S207000
Reexamination Certificate
active
07469414
ABSTRACT:
Apparatus, methods, and computer program products for detecting or locating a viable data carrier in a downstream channel by a cable modem. Potential channels for data carriers can be eliminated quickly by going through a “screening” process, i.e., the first constellation diagram match, thereby preventing those potential channels from going through a significantly more time-consuming second constellation match. The determination of whether the signal in the potential channel is modulated according to the first particular modulation scheme is done rapidly and only potential channels containing a signal likely to be modulated according to the second particular modulation scheme are examined for the second determination step.
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Chen Wei-Sing
Naegeli Charles J.
Roeck Guenter E.
Austin Shelton
Cisco Technology Inc.
Grant Christopher
Weaver Austin Villeneuve & Sampson LLP
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