X75HD/X75SD Installation and Operation Manual 147
Chapter 8: Video Configuration
Video/Audio Timing Tool
The X75OPT-V2A video/audio timing tool is a software upgrade that
makes it possible to correct lip sync problems that occur during
conversions. (The video/audio timing tools consists of a receiver and
transmitter; the transmitter is free; the receiver is an optional upgrade
requiring a software key.) The V2A enables a receiving X75HD/X75SD
to analyze video and audio test signals and then detect any time
propagation differences that may occur during the following processes:
• Up-, cross-, and down conversion
• Analog to digital conversion
• Digital to analog conversion
• MPEG coding and decoding
The feature can be enabled to operate manually or automatically. The
automatic mode aligns received video and audio signals that are up to
1.3 seconds apart.
A user menu (Video/Audio Timing) includes the timing tool’s
parameters. The menu’s parameters perform the following functions:
• Display the time by which each audio channel is leading or lagging
the video (either SD1, SD2, HD, and/or analog)
• Enable you to load the currently measured video delays to the audio
delay parameters, effectively performing audio/video
synchronization
The X75OPT-V2A video/audio timing tool will only insert audio
delays, and thus will not account for situations in which the measured
audio processing paths (shown in the middle box of Figure 8-2 on
page 148) are longer than the video processing paths—even though the
tool will be able to display it. If audio is lagging behind the video, the
V2A feature can measure the difference, but the user must add the video
delay; it cannot be automatically corrected.
Note
CCS versions 3.1.2 and earlier
do not reliably distinguish
between disabled audio
parameters and read-only audio
parameters.
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