"SFTV_troy" wrote in message
ups.com...



I see your point, but that seems a trivial difference. Especially
since HD also uses a separate signal (exciter), separate from the
analog signal. "As with AM, FM stations may use separate exciters to
modulate the very different signals." - wikipedia.

Sounds like simulcast of two signals.

Not just one.



IBOC was engineered from the get-go with compatible recievers in mind. The
receivers would autoswitch from the analog to the digital signal.

Was DRM engineered with such autoswitching receivers in mind?

Are any such autoswitching receivers currently available?

Frank Dresser