我国地面数字电视广播的发展过程,离不开数字调制技术的支持。信号的接收与传输受很多不确定因素的干扰,对整个系统的稳定性造成了严重的影响。而地面数字电视广播正常的工作,需要保证其信号的产生及传输过程的科学合理性。数字广播信号的发送及相关频率的调制,都受到一些国际通用的标准协议约束。做好地面数字电视广播的整体工作,就必须对其中涉及的数字调制技术的相关原理进行必要的掌握。 The development of digital terrestrial television broadcasting in our country can not be done without the support of digital modulation technology. The reception and transmission of signals are disturbed by many uncertainties and have a serious impact on the stability of the entire system. The normal work of terrestrial digital television broadcasting needs to ensure that its signal generation and transmission process is scientific and reasonable. The transmission of digital broadcasting signals and the modulation of the related frequencies are all constrained by some internationally accepted standard protocols. To do a good job of the terrestrial digital television broadcasting as a whole, we must make the necessary mastery of the relevant principles of the digital modulation techniques involved in it.