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> When a FM signal may be slightly degraded with static, DAB just gives up entirely.

You'd think that this would be a good scenario for 'hierarchical modulation':

> Hierarchical modulation is particularly used to mitigate the cliff effect in digital television broadcast, particularly mobile TV, by providing a (lower quality) fallback signal in case of weak signals, allowing graceful degradation instead of complete signal loss. It has been widely proven and included in various standards, such as DVB-T, MediaFLO, UMB (Ultra Mobile Broadband, a new 3.5th generation mobile network standard developed by 3GPP2), and is under study for DVB-H.

* https://en.wikipedia.org/wiki/Hierarchical_modulation

Combine that with scalable audio quality:

* https://en.wikipedia.org/wiki/MPEG-4_SLS

* https://en.wikipedia.org/wiki/Bitrate_peeling



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