Also known as: channelizer, channelization
A channelizer splits a single wideband IQ capture into many narrow channels at once.1 Each output is one channel, shifted to baseband, filtered, and decimated — so one SDR can feed many decoders in parallel.
Overview
Efficient channelizers use a polyphase filter bank to extract evenly-spaced channels at once. In a trunking context this is what lets GopherTrunk watch the control channel while simultaneously following the voice channels it assigns.
Sources
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Filter bank — Wikipedia, on polyphase filter banks used to split a band into channels. ↩