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本文介绍了有线数字电视信号的形成过程及网络维护要求,详细阐述了信道功率、调制误差率、误码率的概念和用QAM测试仪来分析星座图与信号质量和系统问题的关系。
This paper introduces the forming process of digital cable TV signals and the requirements of network maintenance. The concepts of channel power, modulation error rate and bit error rate are expounded in detail. The relationship between constellation and signal quality and system problems is analyzed by QAM tester.