1、Rec. ITU-R BS.1349 1RECOMMENDATION ITU-R BS.1349IMPLEMENTATION OF DIGITAL SOUND BROADCASTINGTO VEHICULAR, PORTABLE AND FIXED RECEIVERSUSING TERRESTRIAL TRANSMITTERSIN THE LF, MF AND HF BANDS(Question ITU-R 217/10)(1998)Rec. ITU-R BS.1349The ITU Radiocommunication Assembly,consideringa) that there is
2、 an established broadcasting frequency plan for the LF band in Region 1 and for the MF band inRegions 1 and 3 (Geneva, 1975) and that this plan is based, inter alia, on a channel width of 9 kHz;b) that there is an established frequency plan for the MF band in Region 2 (Rio de Janeiro, 1981) and that
3、 thisplan is based, inter alia, on a channel width of 10 kHz;c) that there is worldwide usage of the HF broadcasting bands with a nominal channel width of 10 kHz and aninterleaved channel spacing of 5 kHz;d) that any attempt to revise the frequency plans referred to above would be extremely time-consuming andexpensive,recommends1. that any system developed for digital sound broadcasting to vehicular, portable and fixed receivers in the LF,MF and HF bands should have emission characteristics which are compatible with the channel widths identified inconsidering a), b) and c).
