In-band on-channel: Difference between revisions

Digital radio standards generally allow multiple program channels to be multiplexed into a single digital stream. In North American FM, this normally allows two or three high-fidelity signals combined in one channel, or one high-fidelity signal andplus several additional channels at medium-fidelity levels that are much higher quality than AM. For even greater capacity, some existing subcarriers can be taken off the air to makeprovide additional bandwidth available in the modulation [[baseband]]. On FM for instance, this might mean removing [[stereophonic sound|stereo]] from the analog signal, relying on the digital version of that signal to provide stereo where availabledesired, andthus making room for another digital channel. Due to the lack of availablereduced bandwidth in AM, IBOC is [[wikt:incompatible|incompatible]] with analog stereo, although thisthat is rarely used todayimplemented, and additional channels are limited to highly compressed voice such as [[traffic]] and [[weather]].