中波调幅广播中插入数字调制信号的信噪比测量探讨  

Discussion of SNR measurement for inserting digital modulation signal in medium wave AM broadcasting

作　　者：周德斌 ZHOU Debin(Academy of Broadcasting Science, SAPPRFT, Beijing 100866, China)

机构地区：[1]国家新闻出版广电总局广播科学研究院,北京100866

出　　处：《电视技术》2019年第1期39-41,48,共4页Video Engineering

基　　金：国家新闻出版广电总局科研项目(2015-58)

摘　　要：本文讨论了一种在中波调幅广播中插入数字调制信号的信噪比测量方法,即AM调制总功率减去载波功率之后再与噪声功率相比的测量计算方法。从AM调制的信号分析、功率分析、噪声分析,与解调后音频基带信号的信噪比关系,信息论等角度论述了此测量计算方法的合理性。并且得出此测量方法与AM调制度无关的结论。This paper discusses a method for measuring the signal-to-noise ratio(SNR)of a digitally modulated signal inserted into a medium-wave AM broadcasting system.i.e.the measurement and calculation method of the AM modulation total power minus the carrier power and then compared with the noise power.The rationality of the measurement and calculation method is discussed from the signal analysis,power analysis,noise analysis of AM modulation,the relationship with the SNR of demodulated baseband audio signal,and information theory etc.And it is concluded that this measurement method has nothing to do with the AM modulation depth.

关 键 词：中波调幅广播 数字调制信号 信噪比测量 信号分析 功率分析 噪声分析 

分 类 号：TN934.1[电子电信—信号与信息处理] TN934.4[电子电信—信息与通信工程]