電気通信技術審議会暫定方式デジタル有線テレビジョン放送伝送実験 : ケーブルテレビ協議会実験報告

抄録

Experiment of 64QAM signal transmission by tentative specifications of Ministry of Posts and Telecommunications at Advanced Cable Technology Center and LCV Co. by Cable Television Association was described. Adjacent channel interference between QAM and NTSC-AM indicated that QAM signal level is desired to be lower than NTSC-AM signal level by about 5 dB. At this signal level, bit error rate versus Composite Triple Beat (CTB) showed that CTB is required to be less than-53 dB. An equalizer eliminated effectively reflection of cables (ex.0.3μs, -20dB). The results indicated practicability of Japanese proposal to ITU-T.