Testing source devices, Testing hdmi source device for lipsync handling – Quantum Data 881 User Manual
Page 597
881/882 Video Test Generator User Guide
(Rev A.22)
579
Testing source devices
With the Analyzer option, the generator can emulate an HDMI sink (display) in order to test
an HDMI source device’s auto lipsync correction handling. With this capability, an HDMI
source device can be tested for its ability to handle audio and video latency values
received in the HDMI vendor specific data block of the CEA extension block of a display’s
EDID.
The EDID Editor application enables users to populate the audio and video latency fields
in the HDMI vendor specific data block on the analyzer. These fields can be adjusted to
test the source's ability to process and compensate for any permissible range of latency
values. The source can then send a test image with both an audio and video component to
the generator. When received, an embedded application in the generator measures the
relative delay on the test image between the audio and video components of the image.
The illustration below depicts this application.
Testing HDMI source device for Lipsync handling
Follow this procedure to perform auto lipsync correction testing on a connected HDMI
source device.
To use analyzer to test source device auto lipsync correction handling:
1. Establish a session with the generator using either HyperTerminal over a serial
connection or Telnet over an Ethernet LAN. See “
Establishing a terminal session with
” on page 31 or “
Establishing a Telnet session with the generator
2. Set EDID audio/video latency values on analyzer using the EDID Editor application.
See “
” on page 547 for details on loading, editing, and
882CA
EDID (DDC)
(TMDS)
DVD
3 - The corrected audio
and video is transmitted
out the HDMI port in a
lip-sync test image.
1 - EDID audio/video
latency values are
configured in the EDID
emulator.
2 - EDID is read from the
emulated display. Lip-sync
latency values are
processed and
compensated for by DVD.
4 – Audio/video latencies
are measured on the lip-
sync test image by
embedded application in
emulated display.
882CA
EDID (DDC)
(TMDS)
DVD
3 - The corrected audio
and video is transmitted
out the HDMI port in a
lip-sync test image.
1 - EDID audio/video
latency values are
configured in the EDID
emulator.
2 - EDID is read from the
emulated display. Lip-sync
latency values are
processed and
compensated for by DVD.
4 – Audio/video latencies
are measured on the lip-
sync test image by
embedded application in
emulated display.