SIGNAL TRANSMISSION METHOD AND SYSTEM,申请号JP19990169238-传众专利搜索

SIGNAL TRANSMISSION METHOD AND SYSTEM

申请公布号：JP2000358223(A)

申请号：JP19990169238

申请日期：1999.06.16

申请公布日期：2000.12.26

申请人：

NTT DATA CORP

发明人：SHIMIZU TAKAO

分类号：H04N7/10;H04H20/77;(IPC1-7):H04N7/10

主分类号：H04N7/10

摘要：PROBLEM TO BE SOLVED: To prevent a television signal and a data communication signal from being mutually interfered even when the television signal and the data communication signal are sent through a coaxial cable. SOLUTION: When a server 1 transmits a 10 Mbps data communication signal to a low pass filter(LPF) 3, the LPF 3 passes frequency components of 40 MHz or below in the data communication signal and are sent to a 75-ohm television TV-RF mixer 7 through a 50-ohm-75-ohm converter 5. An amplifier 25 with a frequency converter converts the frequency of a signal at an L- TV-VHF band from an antenna 23 into the frequency of a signal at an H- TV-VHF band (or of a signal at a UHF band) and transmits the converted signal to the mixer 7. Since the TV signal and the data communication signal are largely apart on the frequency axis, the mixer 7 transmits them to a receiving end unit 11 through a coaxial cable 9.