The paper chiefly introduces the principle of all-digital modulation in IF. The key issue of how to design a all-digital modulator is emphasized.

介绍中频全数字调制技术的原理，重点讨论设计全数字调制器的关键问题。

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This paper describes the realization of ATSC 8-VSB Modulator of the VSB-based HDTV terrestrial broadcasting system by using almost all digital methods.

本文介绍了一种用数字方式实现美国数字电视地面广播系统中的8 VSB调制器的方法。

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