Quantum Data 881 - Manual (Page 591)

881/882 Video Test Generator User Guide (Rev A.22) 573
Testing display (sink) devices
The generator can emulate a source device in order to test an HDMI display device’s auto
lipsync correction handling. With this capability, an HDMI display device can be tested for
proper audio and video synchronization using a lipsync test image.
A display's EDID provides audio and video latency fields in the HDMI vendor specific data
block of the CEA extension block. Upon reading the EDID, the generator uses an
embedded application to process the audio and video latency values and compensates for
the difference within a generated lipsync test image. Using a blinking white box and an
audible beep, the lipsync test image allows you to assess proper audio/video
synchronization at the display. The illustration below depicts this application.
To test display device auto lipsync correction:
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
the generator ” on page 31 or “ Establishing a Telnet session with the generator ” on page
34.
2. Connect the 882 HDMI output (Tx) port to the display device.
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