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Technical Explanation
1. Outline
RDS (Radio Data System) means the system to transmit control signal such as frequency
information for tuning, traffic information and so on.
RDS signal which is DSB modulated at sub carrier frequency of 57kHz is FM modulated into
main carrier signal.
Table-1 shows the details for RDS signal.
Figure 1 shows the frequency spectrum at "RDS signal and stereo modulated (composite ) signal.
[Table-1] RDS signal's Specification
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S i
P
,
Sufi Searnehnneauiatian
corn
Bue Sideband Carrier Suppression
Amplitude Modulation
RDS only: +2kHz
TRI: + 1.2kHz
Data Modulation Form
Two Phase PSK (Phase Shift Keying )
Data Coding Form
Differential Coding
7kHz
+2.
%cosi
Osaipied Banawidth
57kHz
2.AkHz(V 100%cosine roll off
Characteristic
Modulation Form
Frequency Deviation
Data Form
(No. 20489)
1-21
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