Signal transmission system for a CATV system
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United States of America Patent
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-
Feb 14, 1989
Issued Date -
N/A
app pub date -
Sep 14, 1987
filing date -
Nov 7, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A CATV (cable television) signal transmitting system for use with a broadcast satellite system includes a receiving stage for receiving a broadcast satellite station signal consisting of base-band video signals and a sub-channel digital audio signals PSK (phase shift keying)-modulated on sub-carriers, demodulators for deriving the video signals and digital audio signals, first modulators for modulating the main carriers of a plurality of CATV channels by the video signals, a second modulator for modulating the main carrier of a different channel by the digital audio signals in time-division manner. The mixed output signal from the first and second modulators is transmitted through a CATV transmission line. A CATV signal receiving system is also provided to produce video signals and digital audio signals which are converted into a plurality of channels of analog audio signals.
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