Technical
appendix RDS
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lnteresting facts about RDS
(Radio
Data
System)
RDS is
a system
fortransmitting auxiliary information
(data)
via
a
radio transmit
ter. The introduction of RDS will considerably enhance the services offered by
FM
radio.
A subcarrier
modulated with
a data channel is broadcast
bythe radio
transmitter together with the conventional stereo
signal
and can be
processed
by tuners that are equipped
for receiving
such signals.
S uch data increase the operati ng conveni ence of the I isteners a nd offer a
wealth
of useful supplementary
information.
During the introductory
phase
the following RDS services will be
offered:
a Program
name
The
program
name comprising up to eight characters wlll be
transmit
ted over the data channel
(Example:
DRS1.
BRF3, BBC1, SWF2).
a Alternate frequencies
lf an FM
program
can be received on multiple frequencies, these so-
called alternate frequencies are transmitted over the data channel.
a ARI
replacement
D uring the introductory
phase
of ten
years,
RDS will eventually replace
the ARI system
which
supplies
information
to
motorists. During this
changeover
period,
receivers equipped for RDS can already be used
while those equipped for ARI can
be operated as usual.
ldentification of transmitters that broadcast traffic information and
their
announcements is
possible
as has been the case
with ARl.
The following
examples are
planned
enhancements to the radio data systerns
which
are to be
implemented
after the introductory
phase.
The scope of these enhancements will
depend on the radio transmitters and on
the
equipment
manufacturers.
O Program type
After the
introduction
of satellite rad io,
the transm
itters will be assigned
a uniform type of
program
identification
(P-TYPE)
such as DRS3,
SWF3, BR4,
ORF3.
Examples are
given
under the
Section
"P-TYPE".
I
Voice
and music
Frequently, a difference in thevolume
between music and voice is desi-
red. ln the future it may
be
possible
to controlthe volume by means
of
the RDS data channel.
O Text
display
One of the refinements
planned
for RDS foresees the
possibility
of
broadcasting any texts
(e. g.
program
changes of a station)
which
can
be made visible on the 64
position
display of future tuners.
O Time
signal
Broadcasting
of control signals that
permit
synchronization
of
local
clocks
with
a ref erence clock. This means
local clocks could be control
led
by the tuner.
However,
these enhancements are
only available if the radio
transmitters
and
the
receivers are
correspondingly equipped.
Conventional tuners cannot use the
RDS information.
Your RFVOX
8260-5 Tuner is already
prepared
for operation with
RDS.
When
the RDS
system
goes
on the air,
your
tuner can
be easily upgraded
by retrofitting
the
corresponding RDS option.
P{YPE
To
permit
logical
grouping
by
program
types, a standard
has
been agreed
upon
in Europe. This means
that all
prograrns
of a
given
type that can be
received in
Europe either directly or via satellite can be accessed by the same P-Type.
P-TYPEI
Designation
I
Description
News
2
Current
affairs
3
Information
4 Sport
5
Fducation
6
Drama
7 Cultures
Science
9
Varied
10 Pop
11
Rock
12 MOR
1
3
Light
classics
14 Serious classics
15
Other
music
1 6-30 Unassigned
31
Alarm
Short
accounts
of
facts, events and
publicly
ex-
pressed
vlews, reportage and actuality.
Topical
programs
expanding or enlarging upon
the
news,
generally
in
different
presentation
style
or concept, including documentary, debate,
or
a
na lysis.
Programs whose
purpose
is to impart advice
in
the
wldest
sense, including Metrological
Repots
and Forecasts,
Consumer
affairs, Medical
help
etc.
Programs concerned
with
any aspect of Sport.
Programs intended
primariiyto
educate, of
which
the
pedagogical
element
is fundamental.
All radio
plays
and
serials.
Programs
concerned
with
any aspect of
National
or Regional culture, including Religious affairs,
Philosophy,
Social Science, Language,
Theatre,
etc.
Programs about the Natural Sciences and Tech-
nology.
Used for mainly
speech based
programs
usually
of
light-entertainment
natuTe, not covered by
above
categories. Examples are; Ouizzes, Panel
Games, Personality interviews,
Comedy
and Sa
ti re.
Commercial
music,
which would
generally
be
considered to
be
of
current
popular
appeal, often
featuring in current
or
recent record
sales charts.
Contemporary rnodern music,
usually
written
and
performed
by
young
musicians.
(Middle
of the Road Music).
Common term to
describe Music regarded to
be
"easy-listening",
as
opposed to Pop. Rock or Classical. Music in
this category is
often, but not always, vocal, and
usually
of short duration
({5
minutes).
Classical
Musicfor
general,
ratherthan specialist
appreciation.
Examples of music in this category
are instrumental
music, and vocal arias or choral
works.
Performances of major orchestral works,
sym
phonies,
chamber music
etc., and
including
Grand Opera.
M us ica I
styles
not fitti
ng
i nto
any of the a bove ca
-
tegories. Particularly used for
specialist
music, of
which Jazz, Rhythm
I
Blues, Folk.
Country.
and
Reggae are examples.
These P-TYPES have not
yet
been defined.
Alarm messages in the event of unexpected
emergencies
{National
catastrophies e.
9.,
f
loods,
fire, etc.)
29
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