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Line 3: '''In-band on-channel''' ('''IBOC''') is a hybrid method of transmitting [[digital radio]] and analog radio [[Broadcasting\|broadcast]] [[Signalling (telecommunication)\|signal]]s [[simulcast\|simultaneously]] on the same [[frequency]]. By utilizing additional digital [[subcarrier]]s or [[sideband]]s, [[Digital data\|digital]] information is "[[Multiplexing\|~~multiplexed~~ ]]" on an [[amplitude modulation\|AM]] or [[frequency modulation\|FM]] analog signal, thus ~~avoiding~~advising [[frequency allocation\|re-allocation]] of the broadcast bands. However, by putting [[radio frequency\|RF]] energy outside of the [[spectral mask\|normally-defined]] [[Communication channel\|channel]], [[Adjacent-channel interference\|interference]] to [[adjacent channel]] stations is increased when using digital sidebands. The addition of the digital sidebands works better in the United States, where the FM broadcast band channels have a spacing of 200 kHz, as opposed to the 100 kHz that is normal elsewhere. The 200 kHz spacing means that in practice, stations having concurrent or adjacent coverage areas will not be spaced at less than 400 kHz. Outside of the US, spacing can be 300 kHz, which causes problems with the IBOC digital sidebands. IBOC does allow for multiple program channels, though this can entail taking some existing subcarriers off the air to make additional [[Bandwidth (signal processing)\|bandwidth]] available in the modulation [[baseband]]. On FM, this could eventually mean removing [[stereophonic sound\|stereo]]. On AM, IBOC is [[wikt:incompatible\|incompatible]] with analog stereo, and any additional channels are limited to highly compressed voice, such as [[traffic]] and [[weather]]. Eventually, stations can go from [[HD Radio\|hybrid]] mode (both analog and digital) to all-digital, by eliminating the baseband [[Monaural\|monophonic]] audio.

In-band on-channel: Difference between revisions