IEC 62106-1:2018
(Main)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
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
Relations
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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 21 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - webstore.iec.ch/advsearchform IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 67 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
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
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publicati
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.