著者

前田 幹夫 松下 吉宏 野田 勉 原田 守夫 瀬藤 幸児 尾花 毅 改正 高章 清水 信作 井口 政昭

出版者

一般社団法人映像情報メディア学会

雑誌

テレビジョン学会技術報告 (ISSN:03864227)

巻号頁・発行日

vol.20, no.35, pp.31-36, 1996-06-20

被引用文献数

6

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Through utilization tests or the 64QAM signal under tentative specifications, intensive works have been made to standardize digital broadcasting signal format over cable television systems. At first, we describe an indoor experiment on the adjacent interference between the 64QAM signal and 3 types of analog modulation signals so far being supposed to transmit through cable television facilities. Next, we describe field tests conducted at 2 operative facilities under allowable ranges of DU ratio.

著者

野田 勉 原田 守夫 宮沢 寛 石黒 公 西山 光生 清水 信作 伊東 晋

出版者

一般社団法人映像情報メディア学会

雑誌

映像情報メディア学会誌 : 映像情報メディア (ISSN:13426907)

巻号頁・発行日

vol.51, no.9, pp.1509-1516, 1997-09-20

被引用文献数

17 1

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The Cable Television Conference working group conducted experiments on the 64 QAM signal transmission in a CATV system from 1995 to 1996. These experiments were based on the tentative specifications of the Telecommunications Technology Council of the Ministry of Posts and Telecommunications (MPT), to promote standardization of the Japanese digital CATV system. Experimental results showed that a C/N of more than 26 dB, a Composite Triple Beat (CTB) of less than -43 dB, and a single carrier interference of less than -30 dB were required to keep a BER of less than 1×10^<-4> without forward error correction. Cable reflection within the conventional CATV standard for NTSC-AM signals was low enough for 64 QAM signals. Experiments on adjacent channel interference between 64 QAM and NTSCAM signals indicated that the 64 QAM signal level needed to be lower than the NTSC-AM signal level by about 4-20 dB. Based upon these results, the Japanese standard was introduced by MPT on December 3,1996.

著者

原田 守夫

出版者

一般社団法人映像情報メディア学会

雑誌

テレビジョン学会誌 (ISSN:03866831)

巻号頁・発行日

vol.49, no.8, 1995-08-20