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

32 Merlin PLUS WNET Manual v2.0
9 Merlin PLUS WheatNet Input Levels and PPMs
The codec supports 6 digital inputs/outputs, which are available as sources and destinations using
the WheatNet-IP LAN interface.
Important Note: Inputs can also be configured using the HTML5 Toolbox Web-GUI. See
Configuring Codec Input/Output 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.
Configure Tieline G3 Codec Audio Reference Scales
Genie, Merlin, Bridge-IT and ViA codecs have more audio headroom than Tieline G3 audio codecs,
therefore the audio metering reference scale needs to be adjusted when these codecs connect to a
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.
dBu dBFS
-16dBu -38dBFS
+4dBu -18dBFS
+22dBu 0dBFS
-11dBu -29dBFS
+4dBu -14dBFS
+18dBu 0dBFS
-9dBu -23dBFS
+4dBu -10dBFS
+14dBu 0dBFS
© Tieline Pty. Ltd. 2017