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DIGITAL RADIO GUIDE TERRESTRIAL TRANSMISSION SYSTEMS - HD RADIO
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additional spectrum, allocated to the inner edge of each primary sideband, is
termed the primary extended sideband. See Figure 4.10.
(7) FM All Digital Waveform
The greatest system enhancements are realized with the All Digital waveform, in
which the analogue signal is removed and the bandwidth of the primary digital
sidebands is fully extended as in the Extended Hybrid waveform. In addition, this
waveform allows lower-power digital secondary sidebands to be transmitted in the
spectrum vacated by the analogue FM signal. Approximately 300 kbps of data is
available in All Digital mode. See Figure 4.11.
Figure 4.11 - All digital spectrum allotment of FM HD Radio system
(8) AM Hybrid and All Digital Waveforms
Unlike the FM HD Radio system, the AM system contains no extended hybrid
capacity. The allocation scheme is represented in Figure 4.12.