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有线数字电视是在模拟有线电视基础上发展起来的,由于新技术的引入,有线数字电视传输系统与原来模拟有线电视传播系统有所不同。其传播质量不但得到了提高,服务功
Cable digital television was developed on the basis of analog cable television. Due to the introduction of new technologies, the cable digital television transmission system is different from the original analog cable television broadcasting system. The quality of its communication has not only been improved, but also its service has been done