World Broadcasting Unions Digital Radio User Manual - page 49

DIGITAL RADIO GUIDE

TERRESTRIAL TRANSMISSION SYSTEMS - HD RADIO

49

additional spectrum, allocated to the inner edge of each primary sideband, is

termed the primary extended sideband.  See Figure 4.10.

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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

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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.