IEC 62106-1:2018

Radio data system (RDS) - VHF/FM sound broadcasting in the frequency range from 64,0 MHz to 108,0 MHz - Part 1: Modulation characteristics and baseband coding

IEC 62106-1:2018 defines the basic layer of the Radio Data System (RDS) intended for application to VHF/FM sound broadcasts in the range 64,0 MHz to 108,0 MHz, which can carry either stereophonic (pilot-tone system) or monophonic programmes (as stated in ITU‑R Recommendation BS.450-3 and ITU-R Recommendation BS.643-3).
IEC 62106-1:2018 together with IEC 62106-2, IEC 62106-3, IEC 62106-4, IEC 62106-5 and IEC 62106-6, cancels and replaces IEC 62106:2015, and constitutes a technical revision.
This edition includes the following significant technical changes with respect to IEC 62106:2015:
• Provision has been made to carry RDS on multiple data-streams (RDS2).

General Information

• Status: Published
• Publication Date: 09-Oct-2018
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.160.40 - Video systems
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Drafting Committee: MT 62106 - TC 100/TA 1/MT 62106
• Current Stage: PPUB - Publication issued
• Start Date: 02-Oct-2018
• Completion Date: 10-Oct-2018

Relations

• Replaces: IEC 62106:2015 - Specification of the radio data system (RDS) for VHF/FM sound broadcasting in the frequency range from 87,5 MHz to 108,0 MHz
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62106-1 ®
Edition 1.0 2018-10
INTERNATIONAL
STANDARD
Radio data system (RDS) – VHF/FM sound broadcasting in the frequency range
from 64,0 MHz to 108,0 MHz –
Part 1: Modulation characteristics and baseband coding

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IEC 62106-1 ®
Edition 1.0 2018-10
INTERNATIONAL
STANDARD
Radio data system (RDS) – VHF/FM sound broadcasting in the frequency range

from 64,0 MHz to 108,0 MHz –
Part 1: Modulation characteristics and baseband coding

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.40 ISBN 978-2-8322-6066-1

– 2 – IEC 62106-1:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 8
3.3 Notation and conventions . 8
3.3.1 Hexadecimal notation . 8
3.3.2 Nomenclature for group types . 8
3.3.3 Capitalized RDS terms. 8
4 Modulation characteristics of the data channels . 8
4.1 General . 8
4.2 Subcarrier generation . 9
4.3 Data-stream subcarrier frequencies for all possible streams . 10
4.4 Subcarrier phase requirements . 11
4.5 Subcarrier level requirements . 11
4.6 Data-stream modulation requirements . 11
4.7 Clock-frequency and data-rate . 11
4.8 Differential coding on all data-streams . 11
4.9 Data-channel spectrum shaping on all data-streams . 12
4.10 Symbol phase shifts of data across data-streams . 15
5 Baseband coding . 16
5.1 Data-stream baseband coding structure . 16
5.2 Data-stream error protection . 16
5.3 Synchronization of blocks and groups across all streams . 17
6 Transmission options on data-streams 1, 2 and 3 . 18
Annex A (normative) Offset words to be used for group and block synchronization . 19
Annex B (informative) Theory and implementation of the modified shortened cyclic
code . 20
B.1 General . 20
B.2 Encoding procedure . 20
B.2.1 Theory . 20
B.2.2 Shift-register implementation of the encoder . 22
B.3 Decoding procedure . 23
B.3.1 Theory . 23
B.3.2 Implementation of the decoder . 24
Annex C (informative) Implementation of group and block synchronization using the
modified shortened cyclic code . 26
C.1 Theory . 26
C.1.1 Acquisition of group and block synchronization . 26
C.1.2 Detection of loss of synchronization . 26
C.2 Shift register arrangement for deriving group and block synchronization
information . 26
Bibliography . 29

Figure 1 – Block diagram of data-stream 0 radio-data equipment at the transmitter . 9
Figure 2 – Block diagram of a typical data-stream 0 radio-data receiver/decoder . 10
Figure 3 – Subcarriers for RDS data-stream 0 and additional RDS2 data-streams 1, 2
and 3 . 10
Figure 4 – Amplitude response of the specified transmitter or receiver data-shaping filter . 13
Figure 5 – Amplitude response of the combined transmitter and receiver data-shaping
filters . 14
Figure 6 – Spectrum of biphase coded radio-data signals . 14
Figure 7 – Time-function of a single biphase symbol . 15
Figure 8 – 57 kHz modulated data-signal . 15
Figure 9 – Structure of the baseband coding . 16
Figure B.1 – Generator matrix of the basic shortened cyclic code in binary notation . 21
Figure B.2 – Shift-register implementation of the encoder . 22
Figure B.3 – Parity-check matrix of the basic shortened cyclic code . 24
Figure B.4 – Shift-register implementation of the decoder . 25
Figure C.1 – Group and block synchronization detection circuit. 27

Table 1 – Encoding rules . 12
Table 2 – Decoding rules . 12
Table 3 – Phase shifts of data across data-streams 1-3 with respect to data-stream 0 . 16
Table A.1 – Offset word codes . 19
Table B.1 – Offset word syndromes using matrix of Figure B.3 . 24
Table C.1 – Offset word syndromes for group and block synchronization . 28

– 4 – IEC 62106-1:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RADIO DATA SYSTEM (RDS) –
VHF/FM SOUND BROADCASTING IN THE FREQUENCY
RANGE FROM 64,0 MHz TO 108,0 MHz –

Part 1: Modulation characteristics and baseband coding

FOREWORD
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