In-building CATV system, down-converter, up-converter and...

Details In-building CATV system, down-converter, up-converter and... In-building CATV system, down-converter, up-converter and...

2005-12-06

2005-12-06

Vu, Ngoc (Department: 2611)

Interactive video distribution systems

Video distribution system with upstream communication

Transmission network

C725S124000, C725S126000, C725S127000, C725S078000

Reexamination Certificate

active

06973670

ABSTRACT:
In an in-building CATV system in which an upward signal is frequency-converted to an in-building upward signal using an up-converter at a terminal side and the frequency-converted in-building upward signal is outputted to an external system after frequency-converting the in-building upward signal to an upward signal for outputting using a down-converter, a high frequency signal for frequency conversion leaking out from the up-converter is occasionally transmitted to the down-converter. Then, a trap circuit for removing the high frequency signal is provided on an in-building upward signal path in each converter. And an equalizer is provided on an upward signal path in each converter to compensate a transmission loss in the frequency band of the in-building upward signal occurring when the in-building upward signal is passed through the trap circuit.

REFERENCES:
patent: 5437052 (1995-07-01), Hemmie et al.
patent: 5557319 (1996-09-01), Gurusami et al.
patent: 5966410 (1999-10-01), Freyman et al.
patent: 6160571 (2000-12-01), Wang
patent: 6581208 (2003-06-01), Inaguma
patent: 6615407 (2003-09-01), Inaguma

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