Solidyne 462dsp, User Manual

Page: 11 / 38

SOLIDYNE 462
dsp – broadcast digital processor Page 11
2.7 RDS CODER
(O P T I O N A L)
Models 462dsp/RDS have
internal RDS coder
.
RDS (Radio Data System) is a system developed
by the European Broadcasters Union (EBU). It
allows adding to a conventional FM transmission,
additional information by means of the inclusion of
sub-carrier that contains data.
Their main applications are:
1.
The automatic tuning of the receiver to a radio
network selected by the user, which, allows to listen
to a program, for example Classic Radio, during a
long trip by the route, with no need to tune manually
the receiver to another station of the same radio
network, when the reception happens to be deficient
when leaving the zone on watch of a determined
station.
2.
Show on the receiver screen the radio network
name that is tuned, for example Radio 1, and the
kind of program: the general news, talk-show,
sports, music, varieties, monk, etc.
3.
The automatic reception of information related to the
traffic. When this feature is selected the news has
priority on the traffic, so that the receiver will
exchange, automatically, within a same network, to
the transmitter that emits information on the traffic,
and once finished this information it will return to be
in tune, automatically, the transmitter that previously
was selected.
2.7.1 RDS – PC connection
For setup and control of RDS stage; the 462’s
“RDS Data” port must be connected to a
computer, using a standard COM (RS-232).
RDS Data PC
2 (RxD) 3 (TxD)
3 (TxD) 2 (RxD)
4 (DTR) 6 (DSR)
5 (GND) 5 (GND)
6 (DSR) 4 (DTR)
7 (RTS 8 (CTS)
8 (CTS) 7 (RTS)
Use a standard crossed serial cable (as known as
“null-modem”). Two female DB-9 connectors are
required. The following table shows the diagram of
connection, although only the connections
emphasized in bold are needed.
The computer is used to transmit data to RDS
coder. These data can change in real time, like
when the names of the songs are transmitted, or
can be a fixed text that it is stored in the internal
memory of the RDS coder.
In order to command the RDS coder; the software
Solidyne-Magic RDS is required. This application
is included in the 462dsp CD-ROM, provided with
the unit. Using this tool you will be able to start to
send RDS data. Please refer to the RDS help file
for detailed information on the software.
2.7.2 Connecting to the transmitter
The models 462dsp/RDS do not require a special
connection. MPX signal contains the RDS
information that is injected directly to the
transmitter when connecting the MPX output
The digital signal that it contains information RDS,
is transmitted with a speed of 1187,5 bit/s and
modulates a subcarrier of 57 KHz, using the
method of Amplitude Modulation with suppressed
carrier, that is added to the multiplexed
stereophonic signal; that it is sent to the
transmitter input. See the blocks diagram shown in
“Chapter 1”.