Part Viii Merlin Plus Input Levels And Ppms - Tieline Merlin PLUS User Manual

24 Merlin PLUS User Manual v2.0
8 Merlin PLUS Input Levels and PPMs
Important Note:
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See
functions can also be configured using the Toolbox Web-GUI. See
Input/Output Settings
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Merlin PLUS supports input expansion with inputs/outputs 3, 4, 5 and 6. Expansion
inputs 3 to 6 must be either all analog or all digital. Expansion outputs 3 to 6 must
also be either all analog or all digital. By default the output selection follows the input
selection, however, inputs and outputs can be configured differently. For example, if you
configure expansion inputs 3 to 6 as analog, you can configure all expansion outputs 3
to 6 as digital AES3. Adjust the output setting independently if required via SETTINGS
Adjusting PPM Meter Reference Scale Settings
By default, the PPM METERS on the front of the codec, or in the HTML5 Toolbox Web-GUI, use
dBFS to express nominal operating, headroom and noise floor levels.
The codec can also automatically adapt to different Tieline reference scales. A Tieline codec with
proprietary Tieline session data enabled will automatically adjust the reference level to suit G5 and
G3 codecs, or Report-IT. When connecting to a non-Tieline codec, or a Tieline codec without
session data enabled, the codec will use the Tieline G5 reference scale setting.
The default Tieline G5 audio reference scale displayed on the PPMs when you connect to a Tieline
G5 codec is -38dBFS to 0dBFS (e.g. Merlin, Genie, Bridge-IT and ViA codec families). Using this
reference scale audio peaks can safely reach 0dBFS without clipping, providing 18dB of headroom
from the nominal 0vu point. The comparison table below outlines the reference scales for G5 and G3
codecs and Report-IT in dBFS, as well as the equivalent dBU scale.
The audio reference level settings in the codec are:
Reference
Level
1 Tieline G5
2 Tieline G3
3 Report-IT
Important Note: If your codec (Genie Distribution, Genie STL and Bridge-IT) supports
sending multi-unicast connections and the Auto (default) reference level is selected, the
first codec you connect with will configure the reference level used for all subsequent
multi-unicast connections.
Configuring AES3 input audio
for more information.
> Audio > Output Type > [Select Outputs] > [Select Analog or Digital]
Description
PPM meter low point
Nominal 0vu reference level
Level at which audio will clip/distort
PPM meter low point
Nominal 0vu reference level
Level at which audio will clip/distort
PPM meter low point
Nominal 0vu reference level
Level at which audio will clip/distort
for more information about digital in/outs. Input audio
Configuring
dBu dBFS
-16dBu -38dBFS
+4dBu -18dBFS
+22dBu 0dBFS
-11dBu -29dBFS
+4dBu -14dBFS
+18dBu 0dBFS
-9dBu -23dBFS
+4dBu -10dBFS
+14dBu 0dBFS
© Tieline Pty. Ltd. 2017