Panda

DTT is digital terrestrial television (freeview, top up TV)
DAB is digital audio broadcasting - broadly speaking the digital equivalent of of FM radio - ie: over short(ish) distances
DRM is digital radio mondiale - broadly speaking the digital equivalent of AM radio. So it's on both MW and SW and provides digital quality reception over very long distances. Very few stations available - Radio Luxembourg were (are?) testing it. Receivers are expensive just now.

Posted By: Winged Eel Creosote, Jul 28, 16:30:06