Solidyne 462dsp, User Manual

Page: 10 / 38

Page 10 broadcast digital processor -
SOLIDYNE 462
dsp
2.4 Digita l audio connections
Optionally, the processor has digital
AES-3
inputs/outputs (models 462dsp/AES).
The
digital input
supports:
Resolution:
16
-
24 bits
Sample rate:
30 KHz
a
96 KHz
.
Internally 462dsp works at 24 bits/192 KHz, the
digital signal is converted internally by a stage
called “Resampler” .
When the digital input is used, is convenient to
connect the analogical input too. In case of losing
the digital connection, the processor switches
automatically to the analogical inputs. The input
mode is selected from the main menu choosing
the option “Setup Input”, as is explained later.
S/PDIF:
You can connect an S/PDIF output to
the AES3 input of 462dsp using an
S/PDIF to AES-3 adapter. The figure
shows a compact adapter XLR BNC.
AES-3 output
has a resolution of 24 bits with a
samplerate selectable between 48/96 KHz (see
“3.2.2 – Output Setup”). The connector is male
XLR.
AES3 input and output cables connect as
following:
XLR Signal
1 GND
2 AES3 (1)
3 AES 3 (2)
AES-3 standard connection
2.5 Console MICstart
With the 462dsp the current processing program
can changes when the study microphones
activates. In this way you can use a processing
specially done for voices. The default adjustment
for voices is the program “09: Voice Impact“.
Obviously; you can copy and customize this
program.
The commutation takes place when grounding the
MICstart input. When this happens the processor
exchanges the program and the access from the
JOG wheel is blocked. When the MICStart input is
opened, 462dsp returns to the previous program.
“Console MICstart” uses a connector RCA type.
With consoles
Solidyne 2300 series , MICstart is
connected directly to the Digisolid output of a
microphone channel (please refers to the manual
of the console). In other consoles, the control can
be solved using the tally signal to activate a relay.
Connect the relay contact directly to the RCA “MIC
Start”; and the coil in parallel to the tally light.
The relay coil voltage depends on the
voltage gives by the console.
When the relay receives tension, the contact is
closed activating the Mic Start function in the
processor. The voice’s program remains active
while the contact is closed.
This feature comes disabled from factory.
In
order to use it, you must enable the option “MIC
PROCESSING” in the processor setup (see “3.2.3
- Processor Setup”).
2.6 MPX output
The MPX cable will be a RG-59 (coaxial 75 ohms),
like the used for CATV. The output connector is
BNC type. The maximum length recommended for
this cable is 25 m. Take care with the grounding;
although this rarely is cause of problems because
all Solidyne processors have MPX differential
outputs, that is to say, with the Earth isolated of
the cabinet, to avoid ground loops.
If some residual humming appears when the
system is on the air; power off the processor. If the
humming disappears, check the input connections
at the processor. If, however, the humming
continues (and only disappears unplugging the
MPX cable), this indicates some problem with the
grounding.
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 462dsp audio output DOES
NOT INCLUDE preemphasis (only the MPX output
has preemphasis).