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I have heard that there is more than one digital AM system. Is that true?

dhMarch 16, 2005

The ITU (International Telecommunication Union) recommends digital broadcasts below 30 MHz.

https://p.dw.com/p/6NQq
This recommendation concerns the DRM system which can be used for longwave, medium wave and shortwave. In the USA, also the IBiquity System is being used for medium wave. The advantages of DRM are the audio quality comparable to FM and the worldwide coverage. (lu)