NewTek TriCaster 2 Elite (3 RU) - Manual (Page 184)

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16.8.1 MEDIA PLAYERS
Video and audio-only files in DDR playlists, along with audio files in the Sounds player, may contain one or
more audio channels. At most, Media Players output the first four audio channels of multiple channels;
additional embedded channels are ignored. Other options and controls in these sub-panels are similar to
those provided for external audio sources.
16.8.2 EFFECTS (TRANSITIONS)
This control group governs the sound embedded in Animation Store Transitions . The remaining control
groups in the Audio Mixer are dedicated to various audio outputs. We’ll come back to them in Section 16.9,
but before we do so, let ’s drill further down into more advanced audio options and tools.
SECTION 16.9 OUTPUT AND PRIMARY BUS CONTROLS
As has been discussed, the Mixer supports four primary audio
busses – MASTER and AUX 1-3 . Each of these is represented by
its own control group in the Audio Mixer output section, and
regu lates sound sent to physical connectors or to ‘logical
outputs’.
Hint: Shift + double click Volume knobs to restore their default
values (0dB).
Settings in all of the control groups in this section take effect
downstream from all audio sources, further modulating and
processing audio sent to outputs as the
AUX and MASTER mixes,
for recording, and for Internet streaming.
16.9.1
HEADROOM NOTES
In digital audio systems, signal levels that
exceed maximum values are uniformly
assigned the maximum value, a condition
known as “clipping”. Clipping inevitably
results in annoying audible issues.
Worse, over-modulation that may not be
apparent while listening during live production
may nonetheless appear in recorded files. This is often true even when levels appear to
be below the ceiling level (0dBFS, the maximum allowable digital level).
Hint: When clipping has occurred, the label for the problem channel turns red briefly, as seen in Figure 208.
Due to this problem, digital audio system designs customarily allow substantial ‘headroom’ above the
benchmark ‘alignment level’, making o ver-modulation much less likely. Often this allowance seems high to
those familiar with analog audio systems; headroom levels between 18 and 24dB are not uncommon in
professional digital audio realms.
FIGURE 208
Secondary audio busses:
Actually, beyond the primary busses
mentioned here, the system
maintains
a large number of secondary internal
busses.
For example, the Solo switch for each
input (a nd output) is actually a ‘send’
that adds sound to a ‘Solo bus’.
Likewise, the IsoCorder™ module
permits discrete recording from the
unmodified audio input associated
with any single video source; this
constitutes up to eight additional
audio busses.