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Re:Listen to HD radio with a $30 RTL SDR dongle by hunter2_ on Sunday November 05, 2023 @10:55PM (#38158659)
Hybrid digital, which I believe refers to having both analog and digital over a single carrier.
Re:Listen to HD radio with a $30 RTL SDR dongle by argilo on Sunday November 05, 2023 @11:06PM (#38158719)
I've heard that term as well, but the official site denies it: https://hdradio.com/trademark/