Radio Data System (RDS) is a communications protocol standard for embedding small amounts of digital information in conventional FM radio broadcasts. The EBU issued the first RDS specification in 1984. The RDS enables a radio listener to scan for a particular type of program -- for example, … More technically, it is an already-modulated signal, which is then modulated into another signal of higher frequency and bandwidth. It is based on characteristics of the signal, not on the transmitter used. Another facility associated with tuning is called the Programme Service Name (PS). When a local radio station is about to transmit a traffic message the fact is flagged to the computer. VHF FM Broadcasting Tutorial Includes: When the radio moves out of the range of one transmitter the radio will seek the strongest signal which has the same PI code, allowing the radio to remain tuned to the same programme. It was originally developed in the early 1970s for point-to-point links within broadcasting networks. When radios fitted with RDS store a station frequency, they also store the PI code along side it. In North America the idea was taken up and the US National Radio Systems Committee issued their version known as the Radio Broadcast Data System, RBDS in 1992. While the country code is specified by the standard, bit 11 to bit 0 is specified by each country local authorities. The RDS-Forum (Geneva/CH) decided at its annual meeting (8-9 June 2015) in Glion/Montreux to bring the new standard RDS2 on the way. Examples include the provision of colour in a black and white television system or the provision of stereo in a monophonic radio broadcast. The Radio Data System development took place mainly in Europe where it was first launched and deployed.The first developments took place in Germany where system was developed to place traffic information onto FM broadcasts using a 57 kHz subcarrier.This trial development was taken up by the European Broadcasting Union, EBU when in 1974 their technical committee proposed a development of the German project to carry traffic information as well as other data. Subsidiary Communications Authorization (SCA) in the United States, and Subsidiary Communications Multiplex Operation (SCMO) in Canada, is a subcarrier on a radio station, allowing the station to broadcast additional services as part of its signal. This allows for quick identification of radio program type, based on country, coverage area, and program reference number. The NTSC video format and MTS are also used in Canada and Mexico. The first developments took place in Germany where system was developed to place traffic information onto FM broadcasts using a 57 kHz subcarrier.