Section 7
–
Video Input Menu
Copyright 2007-2017 Lumagen, Inc Radiance Pro, Rev 071719
27
Genlock
Genlock is used to provide a constant video delay from input to output, and to avoid an occasional dropped
or repeated frame. With Genlock on the input to output video delay is the same within a few milliseconds.
Genlock increases switching delays
Note:
Some TVs and projectors do not work well with Genlock since to stay in “lock” it varies the clock rate slightly
over time. If it is to be enabled do enough testing to ensure your TV/projector works.
Note:
Due to additional switching delay Lumagen suggests not enable Genlock for 50 or 60 Hertz sources for
faster “channel surfing.” If you choose to use Genlock Lumagen recommend using both
Auto24-Normal
.
By default, Genlock is off. Genlock can be set to off for all input rates, on for only 24p and 25p input rates,
or on for all input rates. There are two Genlock modes, Normal and Fast. Normal uses the input video clock
as the clock source for the Genlock PLL. Fast mode uses an internally generated clock for Genlock and steps
this clock rate up or down by small increments to keep the input and output clock to the same delay. Some
TVs and projectors will work better with one or the other, but this needs to be determined by experimenting
with each.
The command is:
MENU
→
Input
→
Options
→
Genlock
→
(Off, Auto24-Normal, Auto24-Fast,
Auto-Normal, Auto-Fast)
Scale Bias
Scaling is normally on to adjust the source to exactly fit the output resolution. If the scale bias is set to
“On”, scaling is enabled unless the input and output resolution match exactly.
Scaling is disabled/enabled
independently for horizontal and vertical.
If the scale bias is set to “Off” scaling is disabled if the input and
output resolutions are close. This is useful when using the Radiance Pro to control aspect ratio for an
anamorphic screen. This case uses
Output Shrink
and since it is difficult to match the input and output
exactly for the 2.35 input to 2.35 output aspect case, turning Scale Bias to off will ensure scaling is disabled
when possible, providing the best possible image quality. One of the Info screens indicates whether scaling
is active (Press
OK
on the remote when no Menu is displayed until the scaling page is visible).
The command is:
MENU
→
Input
→
Options
→
Scale Bias
Video Delay
In the past video has often lagged the audio causing lip-sync issues. However, now with advanced audio
codecs, such as ATMOS, and DSP enabled speakers, sometimes it is the audio that lags the video. The
Radiance Pro can delay the video in frame increments up to about 116 mS for 60 Hertz source, or about 250
mS for 24 Hertz source. The
Video Delay
setting is labeled in 16 mS increments (steps of 60 Hertz frames).
The
Video Delay
allows selecting the amount of additional video delay (above base video delay). Since this
delay is in source frame increments the Pro then chooses the closest number of frames to the selected
delay. As an example, for selection of 83 mS, the additional delay would be 5 frames at 60 Hertz, or two
frame times at 24 Hertz. The audio processor audio delay can be used in conjunction with the frame based
Video Delay to achieve the desired video to audio lip-sync. For example, for a 24 Hertz source the video
might be delayed by two frames (83 mS), and the audio delayed by 33 mS, making the net lip-sync correct
50 mS of video delay. This can be changed on a per-input and per-input memory by changing the
programmed video delay. The command is:
MENU
→
Input
→
Options
→
Video Delay
Input Label
Each input configuration memory can be named. Follow the on-screen directions. The
and
arrows
select which input to change and then which character to change. The
and
arrows change the selected
character. The command is:
MENU
→
Input
→
Label
