Note:
Normally, the “
Off”
selection under the Pre-emphasis options would not be used in
conventional FM transmission applications, but is provided in instances where processing
of a flat signal is desired. One example would be when preprocessing prior to a satellite
uplink in distributed radio networks.
[Ana De-emp] (Analog De-emphasis)
This control sets the De-emphasis for the analog XLR outputs. It does not affect the
headphone jack output, which has its own automatic de-emphasis. There are two choices
for De-emphasis: “
On”
and “
Off”
. When on, the De-emphasis automatically follows the
setting of the Pre-emphasis control.
[AES
De-emp]
(AES/EBU
De-emphasis)
This control sets the De-emphasis for the AES/EBU digital output. There are two choices
for De-emphasis: “
On”
and “
Off”
. When on, the De-emphasis automatically follows the
setting of the Pre-emphasis control.
[LW De-emp] (Livewire De-emphasis)
This control sets the De-emphasis for the Livewire output. There are two choices for De-
emphasis: “
On”
and “
Off”
. When on, the De-emphasis automatically follows the setting
of the Pre-emphasis control.
IMPORTANT NOTE:
The De-emphasis should normally be set to “
Off”
when feeding an
outboard digital exciter, stereo generator or discrete, uncompressed studio-transmitter link (STL).
In these kinds of installations it is
very important
that the OmniaONE FM is the
ONLY
device
applying the pre-emphasis. All other equipment following the OmniaONE FM must have their
pre-emphasis disabled for optimum peak modulation control and sound quality.
When set to “
On”,
these outputs can also be de-emphasized for applications that require a flat
frequency response, such as when used for monitoring.
ITU BS-412 Power Limiter
In certain parts of the world, the average multiplex signal power must be controlled to reduce
adjacent channel interference. The currently enforced standard falls under the ITU BS-412
regulations. The OmniaONE FM has a very effective Multiplex Power Limiter that may be
enabled to comply with these regulations.
Loudness Loss Warning!
If your country's regulatory agency does not require the use of the ITU BS-412 Multiplex Power
Limiter, make certain that the BS-412 Power Limiter is set to “
Off”
, or severe loss of loudness
will result! For example, when the ITU BS-412 Power Limiter is switched on and set at 0.0dB,
there is approximately a FIVE dB loudness loss over the limiter being switched off!
[BS-412]
This control enables (
On
) or disables (
Off
) the BS-412 Power Limiter. The default
setting is
Off.
[BS-412 Lim]
When
On
above, this control sets the average multiplex power from -3.0dB up to 9.0dB
(in 0.25dB steps) with respect to the original 0.0dB ITU BS-412 standard.
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