In-building CATV system, and up-converter and down-converter for use therein
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 2, 2003
Grant Date -
N/A
app pub date -
Feb 18, 2000
filing date -
Feb 19, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A down-converter comprises a frequency division circuit, PLL, and local oscillation circuit to convert a signal from a reference oscillation circuit to a converting reference signal with a constant frequency, and uses this signal to frequency-convert an in-building upward signal to an upward signal able to be transmitted in an external bi-directional CATV system. When the frequency of the converting reference signal deviates from the frequency of the converting reference signal on the side of an up-converter for converting the upward signal to the in-building upward signal on a terminal side, the upward signal cannot be accurately restored. Therefore, the down-converter uses the frequency division circuit to convert the converting reference signal to a transmitting reference signal with a low frequency, and outputs the transmitting reference signal to the terminal side.
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Cited Art Landscape
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