Radio Data System for VHF/FM broadcasting.
The developers aimed at making radio receivers very user-friendly. Listeners should be able to see the programme service name (PS) on an eight character alpha-numerical display and the transmitter frequency information, as displayed on non-RDS radios, is then only used in the background by an RDS radio. The tuner is able to choose the transmitter frequency, among a number of alternatives, that gives the best quality reception.
Travel information with RDS is currently possible using the Travel Programme (TP) and Travel Announcement (TA) flags.
Once a radio is tuned to a programme service broadcast within a network, using the RDS feature Enhanced Other Networks (EON), additional data about other programmes from the same broadcaster will be received. This enables the listener, according to their choice, to have the radio operating in an automatic switch-mode for travel information or a preferred Programme Type (PTY, e.g. News).
Another feature of RDS is accurate Clock-Time, displaying the time/date when selected.