Alpine 7525R - Page 29

@ R.D.S. METHOD
The
R.D.S.
(Radio
Data
System)
is
a
broadcasting
system
in
which
digital
data
for
automatic
tuning,
etc.,
on
car
radios
is
added
to
the
FM
radio
signals.
Its
standards
are
set
by
the
E.B.U.
(European
Broadcasting
Union).
Automatic Tracing
Point A
Point B
To
keep
receiving
the
same
broadcast
when
moving
from
point
A
to
point
B
with
the
network
shown
above,
it
was
previously
necessary
to
tune
in
the
next
station
(1
to
4)
either
manually
or
using
the
seek
operation
once
the
reception
got
bad.
The
auto
tuning
system
automatically
switches
the
reception
station
to
the
station
in
the
network
offering
the
best
reception.
RDS Signal
RDS Signal
ARI Signal
Stereo
Audio
Signal
RDS
Signal
= Ss
D> fe>)
© c
o o
_ —
— -
n Y
- =
S
2 a
ce) n
Frequency (kHz) Frequency (kHz)
The
RDS
data
are
transferred
as
shown
above
so
that
they
do
not
give
any
influence
on
the
sound
signals.
RDS Data Structure (Sample of type 0A group)
Group (104 bits)
Checkword Checkword Checkword
ae
+ + + : ‘
offset A offset C offset D