IEC 62634:2011

Radio data system (RDS) - Receiver products and characteristics - Methods of measurement

IEC 62634:2011 describes how to measure minimum RDS receiver performance requirements which concern three RDS receiver product categories. It should be noted that there are also RDS receiver products on the market that significantly out-perform the minimum RDS receiver performance requirements quoted. Methods and algorithms to achieve automatic programme service-following by means of AF lists are customer- and manufacturer-specific, and are therefore not covered in this standard. It cancels and replaces IEC 60315-9, published in 1996, and constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 60315-9:
- use of state-of-the-art measuring methods based on today's RDS products;
- provision of realistic performance targets;
- is complementary to RDS standard IEC 62106 (2009);
- it covers the challenging RDS receiving conditions "weak signal", "adjacent channel" and "strong signal" to verify the required RDS sensitivity and selectivity for three different RDS product categories.

Système de radiodiffusion de données - Caractéristiques et méthodes de mesure des récepteurs RDS

La CEI 62634:2011 décrit les exigences minimales de performance des récepteurs RDS, qui concernent trois catégories de produits de récepteurs RDS. Il convient de noter qu'il existe sur le marché des récepteurs RDS qui dépassent largement les exigences minimales de performances indiquées ici pour les récepteurs RDS. Les méthodes et algorithmes utilisés pour le suivi automatique des stations au moyen des listes AF sont spécifiques aux clients et aux fabricants; par conséquent, cet aspect est volontairement exclu de la présente norme. Cette publication annule et remplace la CEI 60315-9, publiée en 1996, et constitue une révision technique. Les modifications principales par rapport à la CEI 60315-9 sont les suivantes:
- utilisation de méthodes de mesure conformes à l'état de l'art avec des produits RDS actuels;
- indication d'objectifs de performances réalistes;
- complémentarité à la norme sur le système RDS, CEI 62106 (2009), traitement des conditions de réception RDS difficiles "signal faible", "canal adjacent" et "signal fort" pour confirmer les exigences de sensibilité et de sélectivité pour trois catégories différentes de produits RDS.

General Information

• Status: Published
• Publication Date: 27-Jun-2011
• ICS: 33.060.20 - Receiving and transmitting equipment
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 30-Mar-2015

Relations

• Revised: IEC 62634:2015 - Radio data system (RDS) - Receiver products and characteristics - Methods of measurement
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62634
®

Edition 1.0 2011-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Radio data system (RDS) – Receiver products and characteristics – Methods of
measurement

Système de radiodiffusion de données – Caractéristiques et méthodes de
mesure des récepteurs RDS
IEC 62634:2011

---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62634
®

Edition 1.0 2011-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Radio data system (RDS) – Receiver products and characteristics – Methods of
measurement

Système de radiodiffusion de données – Caractéristiques et méthodes de
mesure des récepteurs RDS


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX Q
ICS 33.060.20 ISBN 978-2-88912-503-6

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 62634  IEC:2011
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 8
4 Measuring method . 8
4.1 Standard measuring signal . 8
4.2 RDS data conditions . 9
4.2.1 General . 9
4.2.2 Matching circuit . 9
5 Measurement of the RDS sensitivity . 10
5.1 General . 10
5.2 Method of measurement . 10
5.3 Presentation of the results . 10
6 Measurement of the RDS data acquisition . 10
6.1 General . 10
6.2 Time to synchronise . 10
6.3 Time to detect a first PI . 11
6.4 Method of measurement . 11
7 Measurement of the large signal capabilities . 11
7.1 General . 11
7.2 Resistance to high wanted signal levels . 11
7.2.1 Method of measurement . 11
7.2.2 Large wanted signal requirement . 11
7.3 RDS performance at large unwanted signal . 11
7.3.1 Method of measurement . 11
7.3.2 Large unwanted signal requirements . 12
8 Measurement of the RDS selectivity . 12
8.1 General . 12
8.2 Method of measurement . 12
9 Considerations and guidelines for evaluation of the dynamic RDS performance . 13
9.1 General . 13
9.2 RDS dynamic behaviour . 13
9.3 Traffic announcements TA/TP . 14
9.3.1 TA message . 14
9.3.2 End of TA message . 14
9.3.3 TP search . 14
9.3.4 TA announcement skip . 14
9.4 Regionalisation . 15
9.4.1 Implementations . 15
9.4.2 Requirement . 15
Bibliography . 16

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62634  IEC:2011 – 3 –
Figure 1 – Coupling circuit . 9
Figure 2 – Matching circuits for RDS product devices with three different input
impedances . 9

Table 1 – Presentation of the measurement result . 12
Table 2 – AF example . 15

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– 4 – 62634  IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

RADIO DATA SYSTEM (RDS) –
RECEIVER PRODUCTS AND CHARACTERISTICS –
METHODS OF MEASUREMENT


FOREWORD
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62634 has been prepared by technical area 1: Terminals for audio,
video and data services and content, of IEC technical committee 100: Audio, video and
multimedia systems and equipment.
International Standard IEC 62634 cancels and replaces IEC 60315-9, published in 1996, and
constitutes a technical revision.
This edition includes the following significant technical changes with respect to IEC 60315-9:
– use of state-of-the-art measuring methods based on today’s RDS products,
– provision of realistic performance targets,
– is complementary to RDS standard IEC 62106 (2009),
– it covers the challenging RDS receiving conditions “weak signal”, “adjacent channel” and
“strong signal” to verify the required RDS sensitivity and selectivity for three different RDS
product categories.

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62634  IEC:2011 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
100/1813/FDIS 100/1850/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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– 6 – 62634  IEC:2011
INTRODUCTION
This International Standard gives commonly agreed measuring methods to complement the
RDS standard IEC 62106 (2009) and the RBDS standard (NRSC-4-A) in the USA.
The RDS measuring methods presented here are directed at all manufacturers of RDS
receiver products, and in particular tuner modules with embedded RDS functionality, including
TMC (see ISO 14819 series of standards).

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62634  IEC:2011 – 7 –
RADIO DATA SYSTEM (RDS) –
RECEIVER PRODUCTS AND CHARACTERISTICS –
METHODS OF MEASUREMENT



1 Scope
This International Standard describes how to measure minimum RDS receiver performance
requirements which concern three RDS receiver product categories. However, it should be
noted that there are also RDS receiver products on the market that significantly out-perform
the minimum RDS receiver performance requirements quoted.
Methods and algorithms to achieve automatic programme service-following by means of AF
lists are, however, very customer- and manufacturer-specific, and are therefore not covered in
this standard.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 62106:2009, Specification of the radio data system (RDS) for VHF/FM sound
broadcasting in the frequency range from 87,5 MHz to 108,0 MHz
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1.1
RDS product category 1
RDS receiver product with high-ohmic input impedance (e.g.for portable devices)
3.1.2
RDS product category 2
RDS receiver product with 50 Ω input impedance (e.g.car radio optimized for active antenna)
3.1.3
RDS product category 3
RDS receiver product with 75 Ω input impedance (e.g. car radio optimized for rod antenna or
home receiver)
3.1.4
RDS reception
the signal at which the RDS signal is received with 50 % non-corrected error-free blocks; in
practice, the level at which the TP bit is immediately detected
3.1.5
large signal behaviour
capability of the RDS receiver to fulfil its function at or in the neighbourhood of strong FM
signals

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– 8 – 62634  IEC:2011
3.1.6
RDS selectivity
capability of the RDS receiver to cope with adjacent signals at both sides of the tuning
frequency: ± 100 kHz, ± 200 kHz
3.2 Abbreviations
For the purpose of this document, the following abbreviations apply.
AF Alternative Frequency
dBμV Signal level in μV; 0 dBμV = 1 μV, 6 dBμV = 2 μV, 20 dBμV = 10 μV
EON Enhanced Other Networks information
FM Frequency Modulation
GUI Graphic User Interface
IPR Intellectual Property Rights
PI Programme Identification
PND Personal Navigation Device
PS Programme Service name
PTY Programme TYpe
RDS Radio Data System
1
RBDS USA Radio Data System
S+100 Unwanted signal, +100 kHz offset from the wanted signal
S−100 Unwanted signal, −100 kHz offset from the wanted signal
TA/TP Traffic Announcement/Traffic Programme
TMC Traffic Message Channel
4 Measuring method
4.1 Standard measuring signal
Unless otherwise stated, the following measuring signal shall be applied.
• Tuning Frequency 97,1 MHz
• Signal input level V 60 dBµV
i
• Deviation Δf 22,5 kHz
• Modulation frequency F 1 kHz
mod
• Pilot 19 kHz deviation 6,75 kHz
• Modulation method L = R
• Deviation RDS carrier Δf 2 kHz
RDS
• De-emphasis 50 µs  (USA: 75 µs)
Where an unwanted signal will be added, for RDS car radio selectivity measurements, this will
be done with the coupling circuit shown in Figure 1. The circuit shows how to couple two
generators with 50 Ω output so that the total output impedance remains 50 Ω. Depending on
the input impedance, one of the matching circuits shown in Figure 2 should be applied in
addition.
—————————
1
 See NRSC-4-A, RBDS standard cited in the Bibliography.

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62634  IEC:2011 – 9 –
50 Ω 16,7 Ω
16,7 Ω
Car radio
G
V1
EMF
50 Ω 16,7 Ω
50 Ω
G
V2
EMF
IEC  1097/11

Coupling circuit to be used to add the unwanted signal V2 for two signal measurements of
EMF
an RDS product.
Figure 1 – Coupling circuit
4.2 RDS data conditions
4.2.1 General
The RDS data shall consist of an appropriate PI code, a PS name, one or more AFs and
chosen values for, e.g. TP (=1), DI (=0000), TA (=0), PTY (=00001) and M/S (=1), with a
maximum repetition rate for group type 0A of four groups per second. Use group type A only.
4.2.2 Matching circuit
For the three types of RDS product devices (modules for portable devices, car radio and
home receiver), the matching circuit is given in Figure 2.

RDS RDS


product product
50 Ω 50 Ω
R R
i i
G G
50 Ω
x kΩ
V V V V
EMF i EMF i
RDS device with RDS device with

high input impedance
50 Ω input impedance

RDS

product
50 Ω 10 Ω 45 Ω
R
i
G
60 Ω
75 Ω
V V
EMF i
RDS device with

75 Ω input impedance

IEC  1098/11

Figure 2 – Matching circuits for RDS product devices
with three different input impedances

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– 10 – 62634  IEC:2011
RF generators have a characteristic impedance of 50 Ω. For a device with an input impedance
of 50 Ω, no additional matching circuit is needed. The antenna input signal V is then
i
V − 6 dB. In case of a category 1 device like a PND, which generally has a high input
EMF
impedance, V is then almost equal to the generator voltage V . When the input impedance
i EMF
cannot be ignored in relation to the 50 Ω generator impedance, the correction shall be
calculated separately.
Example: For a device with 2 kΩ input impedance this will give V = V × 2 000/(2 000 + 50)
i EMF
and in dBµV this yields V dBµV = V dBµV − 0,2 dBµV.

i EMF
5 Measurement of the RDS sensitivity
5.1 General
The lowest FM input signal is determined for which RDS reception is obtained.
5.2 Method of measurement
The receiver and the signal source are operated under standard measuring conditions,
according to 4.1.
a) When a GUI is available, which is capable of measuring good and bad blocks, then a
reading of 50 % good blocks is an accurate result for the sensitivity measurement. The
ratio should be calculated over at least 2 000 receivable blocks.
b) A good alternative in the case, where a GUI and statistical read-out is not available to
measure the level of correctly received RDS blocks, is the TP flag.
Turn the signal level up until 50 % error free RDS blocks are received. Alternatively, turn the
signal level up until the TP flag lights up. Repeat this three times and take the average value
of these three observations.
NOTE If the TP flag cannot be displayed, then the complete PS can be used instead. However, care should be
taken that a new programme service name is entered into the RDS encoder each time a new measurement is done.
The new programme service name shall differ from the previous one in all eight characters.
5.3 Presentation of the results
The result is presented in dBµV
Minimum receiver sensitivity requirement: RDS product category 1 21 dBµV
RDS product category 2 18 dBµV
RDS product category 3 18 dBµV
6 Measurement of the RDS data acquisition
6.1 General
Particularly for tuner modules or circuits with RDS fully integrated for mobile use, it is
important to know the time to synchronize after a re-tune. Strongly related to this is the time
to receive the PI code for the first time.
6.2 Time to synchronise
When tuned to an FM-RDS station, it is important to have RDS synchronisation immediately.

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62634  IEC:2011 – 11 –
Taking into account the synchronising time of the system and the recognition of at least two
consecutive RDS blocks, the time to synchronise RDS shall be maximum 120 ms, 80 % over
100 measurements.
6.3 Time to detect a first PI
In addition to the time to synchronise, it is often required to specify the time to detect the PI
code for the first time. There is a fixed relationship between both, the PI code is present in
block A of all groups and in block C’ of the B groups. The maximum time shall not exceed
180 ms. A value of 160 ms shall not be exceeded in 80 % over 100 measurements.
6.4 Method of measurement
The tuner module or receiver and the signal source are operated under standard measuring
conditions, according to 4.1.
The RDS monitor program on the PC screen shall provide the information of time needed to
synchronise. Tune from a frequency higher and a frequency lower than the wanted frequency
of 97,1 MHz. (Tuning should be from both sides of the wanted frequency, because the
behaviour can be different). Read out the value for the time needed to synchronise and the
time needed to read the PI code.
Repeat this at least 100 times. 80 % of the results shall then be below the minimum
requirements.
The following minimum requirements apply.
• Time to synchronise 120 ms
• Time to PI detection 160 ms
7 Measurement of the large signal capabilities
7.1 General
The two issues to be dealt with are the following.
a) The product shall be resistant to high signal levels of the wanted frequency.
b) RDS decoding shall work correctly in the presence of strong FM signals other than the
wanted one.
7.2 Resistance to high wanted signal levels
7.2.1 Method of measurement
The tuner module or receiver and the signal source are operated under standard measuring
conditions, according to 4.1; turn the input signal level up until 120 dBµV.
7.2.2 Large wanted signal requirement
No defects shall occur.
7.3 RDS performance at large unwanted signal
7.3.1 Method of measurement
The tuner module or receiver and the signal source are operated under standard measuring
conditions according to 4.1. In addition, one of the signals according to Table 1 is added.

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– 12 – 62634  IEC:2011
Table 1 – Presentation of the measurement result
Wanted frequency Unwanted frequency Result
97,1 MHz 91,1 MHz ____ dBµV
RDS sensitivity level
+6 dB
103,1 MHz ____ dBµV

The wanted and unwanted signals are applied simultaneously by means of a combining
network in accordance with 4.1. Adjust the RF level of the wanted frequency to the RDS
sensitivity level (50 % correct RDS blocks) without the unwanted signal. Add 6 dB to this level.
Adjust the unwanted strong signal until the RDS sensitivity level of 50 % correct blocks is
reached again.
7.3.2 Large unwanted signal requirements
The following are minimum large unwanted signal requirements:
• RDS product category 1 RDS reception at 50 % correct blocks 60 dBµV
• RDS product category 2 and 3 RDS reception at 50 % correct blocks 88 dBµV
8 Measurement of the RDS selectivity
8.1 General
RDS selectivity: The capability of the RDS receiver to cope with adjacent signals at both sides
of the tuning frequency: ± 100 kHz, ± 200 kHz.
8.2 Method of measurement
The wanted and unwanted signals are applied simultaneously by means of a combining
network in accordance with Figure 1. Adjust the RF level of the wanted frequency without the
unwanted signal to the RDS sensitivity level (50 % correct RDS blocks).
Add 6 dB to this level.
Add the unwanted frequency: Tuned wanted frequency with a distance of ± 100 kHz,
± 200 kHz
Deviation Δf 22,5 kHz
Modulation frequency F 1 kHz
mod
Modulation method L = R
De-emphasis 50 µs (USA: 75 µs)
Check the RDS reception. Adjust the unwanted signal until the RDS sensitivity level of 50 %
error-free blocks is reached again.
The level of the unwanted signal related to the wanted signal in dB is presented as
S+100, S-100, S+200, S-200 RDS selectivity.
The following are minimum RDS selectivity requirements:

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62634  IEC:2011 – 13 –
• RDS product category 1: S ± 100  2 dB, S ± 200  32 dB
• RDS product category 2: S ± 100  4 dB, S ± 200  50 dB
• RDS product category 3: S ± 100  4 dB, S ± 200  50 dB
9 Considerations and guidelines for evaluation of the dynamic RDS
performance
9.1 General
The issues in this clause are highly significant for a well performing RDS product, mostly car
radios. However, clear performance values and levels cannot be given, because of
manufacturer and/or customer specific implementations. Therefore a set of general
considerations and guidelines is given here with the view to help to evaluate the dynamic
RDS performance in the products concerned.
9.2 RDS dynamic behaviour
An ideal RDS radio switches in time inaudibly over to an alternative frequency (AF) with the
best audio quality. Variations in sound should not occur.
Car radio manufacturers have developed algorithms to achieve this in the best possible way.
Therefore objective criteria or switching levels will not be specified, as they are often subject
to IPR. In this standard a few key criteria are nevertheless given, which will need to be taken
into account, where applicable, in order to ensure a proper dynamic behaviour
...