Interactive video distribution systems – Video distribution system with upstream communication – Transmission network
Reexamination Certificate
2011-08-16
2011-08-16
Beliveau, Scott (Department: 2427)
Interactive video distribution systems
Video distribution system with upstream communication
Transmission network
C725S126000, C725S149000, C348S558000, C348S465000, C348S467000, C375S316000, C375S346000
Reexamination Certificate
active
08001579
ABSTRACT:
A downstream bandwidth output level and/or output level tilt compensation device that can be inserted into a signal transmission line of a CATV system on a premise of a user. The device includes a tuner that identifies low and high band signal channels, and a channel analyzer that determines a format of each of those channels. A signal measurement measures low and high band signal strengths. An offset circuit adds or subtracts an offset value to the low and/or high band channel signal strengths depending on whether the respective channel is analog or digital. A microprocessor compares the low and high band signal strengths, including any offset values, to a predetermined signal strength loss curve. A variable output level compensation device and a variable slope adjusting circuit are provided to amplify and adjust the gain slope of the downstream bandwidth.
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Kelma David
Lai Joseph
Olson Thomas A.
Palinkas Raymond
Beliveau Scott
John Mezzalingua Associates Inc.
Luong Alan
Schmeiser Olsen & Watts LLP
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