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The Radio Data System (RDS) is an add-on data service, used by many 87.5 to 108 MHz FM radio stations. The purpose of RDS is to increase the system functionality

1997年在中国广州成立测试用DRM数字广播系统，主要的目的是要测试数字化最高至30MHz（长波、中波和短波）的AM广播波段。

HD Radio Technology, which allows the transmission of digital radio broadcasting in the AM and FM bands, is transforming the radio experience. This technology has been developed by iBiquity Digital Corporation and is supported by leaders in the broadcasting, consumer electronics, retail and automobile industries.

声学基础 华中科技大学课件 简单易懂 对于声学、降噪、音频编解码有兴趣的同学可以看一看

Basic Concept of Sound 声音的基本概念介绍 比较清楚和简单