Solidyne 562dsp, User Manual

Page: 11 / 44

SOLIDYNE 562 dsp EVOLUTION – FM broadcast digital processor Page 11
When enters to the transmitter through the MPX
input, make sure that the internal preemphasis
network IS DISCONNECTED (that is to say, flat
response from 20 to 100 KHz). Contrary, when
use an external stereo coder, make sure that the
generator INCLUDES the preemphasis curve.
This is thus since the 562dsp audio output DOES
NOT INCLUDE preemphasis (only the MPX output
has preemphasis).
2.6 RDS C ODER
(O P T I O N A L)
Models 562dsp/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.
2.6.1 RDS – PC connection
For setup and control of RDS stage; the 562’s
“RDS Data” port must be connected to a
computer, using a standard COM (RS-232).
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 562dsp 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.
2.6.2 Connecting to the transmitter
The models 562dsp/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”.
2.7 RS-232 re mote c ontrol
The connector
PC CONTROL RS 232
allows to
connect a PC directly to the unit. Using the
software 562dsp VirtualRack you have full control
of the 562dsp. Please refer to
“Chapter 5 –
Remote control”
to see details on the software.
To conect the 562dsp to the PC use a standard
RS232 serial cable
(male-female DB-9).
The computer must have one RS-232 available. If
the computer only has USB ports, a
USB to RS-
232 adapter
can be used. Make sure to use a
good quality adapter.
2.8 Ethernet connection ( OPTIONAL)
RJ-45 Ethernet connector allows connecting the
processor directly to a LAN. The unit can be
controlled via TCP/IP from another PC of the LAN
or via Internet; using the software
Solidyne
562dsp VirtualRack . See “ Chapter 5 – Remote
Control” for software details.
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)