The groups are the first to sign up to the network in the technology's commercial radio debut.
EPG, which is traditionally used by interactive TV, is a stream of information sent by a broadcaster and decoded by a digital receiver. It provides listeners with instant scheduling information and exclusive text, graphical and interactive programme-related content. When a presenter discusses an issue or runs a competition, listeners are able to receive further information at the push of a button.
Upgrades developed by UBC's technological division, Unique Interactive, for PC-based digital radio receivers, which will let listeners access the network, will be available free of charge. Portable EPG-capable receivers are due to be available next year.
UBC part-owns four regional digital-radio multiplex licences; Capital has 42 digital radio licences; and Chrysalis Group is part of the MXR Consortium, which operates four licences. The three combined have a potential audience of 22.5 million.
Simon Cole, chief executive of UBC, said: "EPG is the gatekeeper to a range of digital radio services. We anticipate other service providers and multiplexes coming on board rapidly."
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