Interactive video distribution systems – Video distribution system with upstream communication – Transmission network
Reexamination Certificate
2011-06-28
2011-06-28
Kelley, Christopher (Department: 2424)
Interactive video distribution systems
Video distribution system with upstream communication
Transmission network
C725S122000, C725S124000, C348S608000
Reexamination Certificate
active
07971225
ABSTRACT:
A device for and a method of decreasing the data rate of a digital return path link in a Cable Television Hybrid Fiber-Coax system (CATV system) is disclosed. At the node of the CATV system, the bandwidth of the a digital data stream representative of an analog return signal is limited to a desired frequency band. The bandwidth-limited data stream is then digitally re-sampled at a predetermined multiple of a center frequency of the frequency band. The re-sampled data stream is then separated into two data streams. Then, these separate data streams are digitally decimated to a lower data rate, interleaved and serialized for transmission to a head end of the CATV system. A reverse process reconstructs the original analog return signal's signal components within the desired frequency band at the head end.
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Finisar Corporation
Flynn Randy
Kelley Christopher
Maschoff Gilmore & Israelsen
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