Quantum Data 881 User Manual page 1047

Purpose
Method
LipSync
Description
882 Video Test Instrument User Guide (Rev A.35)
An out-of-focus monitor displays fuzzy graphic images and poorly formed, hard-to-read
characters when text is displayed on the screen.
On monitors with a single (static) focus adjustment, adjust the control for the best average
focus over the entire screen. The focus at certain locations of the screen should be within
specified limits.
Some monitors have a static and one or more dynamic focus controls. The sequence for
adjusting them and the areas of the screen they affect depend on the monitor under test.
The lipsync image enables you to test for synchronization between HDMI video and audio.
The image enables you to select between a range of intervals. You can access the
subimages to control the interval of each video/audio synchronization event through the
Content->Options menu and incrementing with the +/- keys. There are 255 distinct
settings (different intervals) available.
When you first select the Lipsync image, the interval is set at 0.66733 sec per audio event
(shown below) for progressive formats and 1.333333 sec for interlaced formats. When you
enable subimages with Content->Option, the default inital screen at image rendition 0 is
one sync event per 1.101100 sec for progressive formats and 2.2 sec for interlaced
formats. You can increase this up to 8.475133 sec at image rendition 254 which is one
video/audio synchronization event per 8.46666 seconds for progressive formats and
16.933332 for interlaced formats.
609