DIGITALIZATION METHOD FOR EXISTING COMMON TELEVISION FACILITY AND COMMON CABLE TELEVISION FACILITY AND AMPLIFIER FOR COMMON TELEVISION FACILITY

摘要

PROBLEM TO BE SOLVED: To digitize an existing small-scaled common analog television facility at low costs without using any high level adjustment technology.;SOLUTION: An HE (head end) amplifier 36 of a temperature compensation system for receiving a ground digital broadcast signal, and for amplifying the broadcast signal is added to the television analog broadcast reception point of an existing common television facility. Furthermore, a trunk line amplifier installed for amplifying the existing analog broadcast signal is exchanged with trunk line amplifiers 18 to 22 of a temperature compensation system without changing the mounting position on a transmission path configured of a coaxial cable 16 from a multiplexer 38 to a subscriber's house. Trunk line amplifiers 18 to 20 change passage frequency characteristics according to an external temperature so that the levels of the analog broadcast signal and the ground digital broadcast signal can be obtained within a reference range at the output side of the following coaxial cable 16.;COPYRIGHT: (C)2010,JPO&INPIT