Importance

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Abstract

In a cable television system having a two-way communication function in which downstream signals are transmitted from a broadcasting center to a plurality of terminals, upstream signals are transmitted from the plurality of terminals to the broadcasting center, and the broadcasting center and the plurality of terminals receive and demodulate the transmitted signals, a level detector of each terminal obtains a level detection signal by detecting the level of a downstream signal from the broadcasting center. A controller stores a level setting signal exhibiting a level change of negative linear characteristics with respect to the level of the downstream signal. The controller includes a level setting function for setting the transmission level of the upstream signal output from a communication signal modulator on the basis of the level setting signal.

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First Claim