Terrestrial component of systems for hybrid satellite-terrestrial digital sound broadcasting to vehicular, portable and fixed receivers in the frequency range 1 400-2 700 MHz
The ITU Radiocommunication Assembly considering: a) that there is an increasing interest worldwide for terrestrial and satellite digital sound broadcasting (DSB) to vehicular, portable and fixed receivers in the frequency range 30-3 000 MHz for local, regional and national coverage; b) that the ITU-R has already adopted Recommendations ITU-R BS.774 and ITU-R BO.789 to indicate the necessary requirements for DSB systems to vehicular, portable and fixed receivers for terrestrial and satellite delivery, respectively; c) that by operating the broadcasting-satellite service (BSS) (sound) in an hybrid configuration the service objectives listed in b) above can be more adequately met; d) that Recommendations ITU-R BS.774 and ITU-R BO.789 recognize the benefits of complementary use of terrestrial and satellite systems, and call for a DSB system allowing a common receiver with common processing very large scale integration (VLSI) circuits and manufacturing of low-cost receivers through mass production; e) that Digital System D H described in Annex 2 meets most or all of the requirements of Recommendations ITU-R BS.774 and ITU-R BO.789, and that the system has been field tested and demonstrated in more than one country; f) that Digital System E described in Annex 3, meets most or all of the requirements of Recommendations ITU-R BS.774 and ITU-R BO.789, and that it has been field tested; g) that some systems included in Recommendation ITU-R BO.1130 have a terrestrial component which allows augmentation of the BSS (sound) part, hence creating a hybrid satellite/terrestrial system.