DRM（Digital Radio Mondiale）保留了传统模拟调幅广播的优点，解决了其诸多的缺点，其为调幅广播带来了新的发展机会和空间。随着世界各国对DRM的不断重视，DRM系统将会逐渐普及。在调幅广播到DRM系统的过渡阶段，DRM信号可能会对调幅广播信号造成干扰。本文在对DRM信号和模拟调幅广播信号分析的基础上，结合模拟调幅广播接收机的解调电路的基本特点和人耳听阈的基本特征，描述了DRM对调幅广播的影响。同时，提出了模数同频保护率的定义及其计算方法。%Keeping the strong point of conventional AM broadcasting and solving the drawbacks of it,the advent of DRM （ Digital Radio Mondiale） is a new chance for the development of AM broadcasting. With the concerns of DRM all over the world, DRM system will become more and more popular. In the transition from AM system to DRM system,DRM signal will probably make the interference with AM signal. In this paper based on the analysis of DRM signal and AM signal,with the feature of demodulation circuit in conventional AM broadcasting receiver and the characteristic of the auditory threshold, the interference is described. Moreover the definition of AM and DRM Co Channel Protection Ratio is presented, and the calculation method is provided.
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