iBOC HD Radio is a digital stream like streaming online using your computer. It buffers for a certain amount of time. This way there is buffer in memory and it is xx seconds behind live. As there are dropouts (and there are many), it uses the buffer so you do not get bubbles or dead air. When you get bubbles and dead air, the buffers run out.
As usual the US and the FCC royally dropped the ball again like AM Stereo or circle jerking around Franken FM signals instead of just opening up the band under 88Mhz for everyone. The HD technology used in Europe and other parts of the world are phenomenal. iBOC would have had a better chance if it was a flash cut like TV was. The Analog/Digital co-existence causes all the signal and reception problems like RTO mentioned.
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