ETC Emphasis Lighting Control System, Руководство пользователя

Страница: 53 / 292

2
Emphasis Console User Interface 43
Channel Concepts in the Emphasis Control System
The Emphasis Control System controls channels using both Highest-Takes-Precedence
(HTP) and Latest-Takes-Precedence (LTP) conventions, and stores information for
channels using both Preset and Tracking conventions. These conventions are described
here so that you can understand the expected behavior of your control channels and cue
playback.
HTP vs. LTP
Emphasis uses two basic channel types – Highest-Takes-Precedence (HTP) channels and
Latest-Takes-Precedence (LTP) channels. In all cases, channels that are parked or
manually controlled by the keypad or through the tools in Emphasis Visualization become
captured and take precedence over any playback controls. See Manual Control, page 72
for more information on selected and captured channels.
HTP
In playback situations, HTP channels will output the level that is highest based on all
channel inputs, like cues and submasters. HTP channels are also referred to as “pile-on”,
because as control inputs are added (you may bring up cues and multiple submasters that
all have a channel recorded at various levels, for example), the system calculates which
input has the highest level for that channel and outputs that level. As control inputs are
taken down (you pull some of those submasters down to zero), the console will adjust the
channel level, if required, to highest remaining level, and so on. Channels that control
dimmers are typically HTP channels.
In cues, HTP channels will always follow the timing of the current cue. It does not matter if
the channel levels are the same from cue to cue. If the fade timing is different from cue to
cue, and you play the next cue before the previous cue completes, the fade time for HTP
channels that are moving will change to the current cue’s fade time.
LTP
LTP channels obey the latest cue command to set their level. They are not affected by
submasters, unless the submaster contains a subroutine (see Subroutines on Submasters
(Subs-on-Subs), page 152 ). LTP channels can also fade in the background . What this
means is that an LTP channel will always listen to the most recently played cue if it is
moving in that cue. If the channel has the same level in a series of cues, and the first cue
of the series is not allowed to complete before you play back subsequent cues, the channel
will complete its fade in the background in the fade time of the first cue.
Channels levels fading in the background are displayed in purple, and cannot be cleared
from the A/B or C/D faders, since they aren’t really in those faders anymore. You can view
cues running in the background using the Fader display. See Background fades, page 149
for more information on channels in the background.
Independent Channels
Both HTP and LTP channels can also be independent . Independent channels are not
affected by the Grandmaster fader, the Blackout key, and Flash and Solo functions.
Independent channels also have protection from the release command, requiring repeated
key presses to return them to zero or recorded levels. Most frequently, color scrollers and
control parameters on moving light fixtures other than intensity are set as independent
channels. This keeps their moving parts from speeding to full or zero unintentionally when
the Grandmaster, Blackout, Flash and Solo are used.