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本文介绍了一种在市级有线数字电视平台下传的数字电视节目中进行台标字幕叠加的系统建设情况。对市级有线数字电视下传的射频信号,采用带阻滤波方法,对选取的频点节目,通过解调、解扰,实行TS流层面的台标字幕叠加,并经64QAM调制后,恢复原平台下传的有线数字电视系统信号的传输。系统建设稳定可靠,成本大大降低。
This article describes a system for building digital terrestrial subtitles superimposed on digital TV programs delivered at a municipal cable digital television platform. On the municipal cable digital TV downlink RF signal, using band-stop filtering method, the selected frequency programs, through the demodulation, descrambling, the implementation of TS stream level subtitles superimposed on the platform, and after 64QAM modulation, restore the original Transmission of platform digital cable television signal. System construction is stable and reliable, the cost is greatly reduced.