360 Systems MAXX-6T - Manual (Page 66)

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Page 66 MAXX 6T Owner’s Manual
ADVANCED TOPICS
System Timing
The Image Server is capable of using an external genlock signal as a timing reference. This allows
the outputs to be timed the same as other video signals in a facility. There are three adjustments to
fine tune this synchronization to compensate for differences in equipment and wiring. Genlock
LINES and SUBPELS set the sync relationship of all of the outputs to the incoming reference. Color
timing is adjustable for each channel independently with the SC/H PHASE setting.
These settings should be made in the following order:
1. Genlock Lines: This is a global setting for all of the outputs. It rarely ever needs to be
adjusted. It allows the output timing to be varied by a line of video. This would be
adjusted so that the output of the first line of video happens concurrently with other
contributing inputs. The visible effect is that the picture will rise or fall by one line when
viewed at the output of a video switcher or on a genlocked monitor. Note that this setting
can cause VBI lines such as Closed Captioning and VITC to appear on different (and
possibly inappropriate) lines.
2. Genlock Subpels: This is a global setting for all outputs. It allows the output timing to be
adjusted by half a pixel. The visible effect is that the picture will move horizontally when
viewed at the output of a video switcher or genlocked monitor. The adjustment is made by
using a waveform monitor and comparing the falling edge of horizontal sync between the
output and another contributing signal (not the genlock signal.) Some video switchers
indicate when a signal is timed within spec; this can be used to determine when the setting
is correct. If correct system timing is indicated over a range of subpel settings, determine
the extreme of the range and set the value in the middle.
3. SC/H Phase: This is a setting per channel, found in the Transport>Options>Configure
menu (it does not appear in the Playlist’s Options menu.) The adjustment is made by using
a vector scope display referenced to the color reference, usually the genlock signal. Play
back the zCBARS clip. Adjust the SC/H PHASE to align the color with the vector scope
points. Note that it is normal to see some slight periodic variation in the vector display.
Using Embedded Audio
Embedded Audio is standard equipment on MAXX 6T. It is based on SMPTE standard 272M-A. Key
features include:
• Synchronous 20-bit audio at a 48K sample rate. Non-synchronous audio and other sampling
rates are not supported.
• While up to 16 channels of audio may be present in an SDI stream (arranged in 4 groups of 4
channels), the Image Server records and plays back only Group 1 audio channels (channels 1-4).
• In E-E mode, all embedded audio will pass through the Image Server unaltered.
• The user can select audio to record from either a +4 analog, AES/EBU digital, or embedded
audio source. Mix-and-match among inputs is not supported.