Title :
A new digital implementation of the RDS in the FM stereo
Author :
Koukourlis, C.S. ; Plevridis, J.E. ; Sahalos, J.N.
Author_Institution :
Dept. of Electr. & Comput. Eng., Democritus Univ. of Thrace, Xanthi, Greece
fDate :
12/1/1996 12:00:00 AM
Abstract :
We deal with some of the main blocks which consist a stereophonic RDS modulation system. As such we consider the 19 kHz pilot tone of the FM stereo, the 38 kHz subcarrier modulated by the difference of the two stereo channels and the 57 kHz subcarrier of the RDS digital signal. Also, a digital substitute of the biphase signal generator required for coding and shaping of the RDS data preceding the balanced modulator, is considered. The substitution of the balanced modulator by a multiplying DAC is another consideration. The synthesis of the three carriers takes place by a multiplexed (triple) direct digital synthesizer (DDS). The multiplexed synthesizer can be considered independently for the generation of multiple frequencies
Keywords :
Hi-Fi equipment; audio coding; digital radio; digital-analogue conversion; direct digital synthesis; frequency modulation; radio data systems; 19 kHz; 38 kHz; 57 kHz; 87.5 to 108 MHz; FM stereo; RDS data coding; RDS data shaping; RDS digital signal; VHF; balanced modulator; biphase signal generator; digital implementation; modulated subcarrier; multiple frequencies generation; multiplexed direct digital synthesizer; multiplying DAC; pilot tone; radio data system; stereo channels; stereophonic RDS modulation system; Baseband; Clocks; Data systems; Digital modulation; Frequency modulation; Laboratories; Receivers; Signal synthesis; Synthesizers; Table lookup;
Journal_Title :
Broadcasting, IEEE Transactions on
