X75HD/X75SD Installation and Operation Manual 235
Appendix B: Troubleshooting
Audio
Lip sync problems
Problem 1
During normal audio processing, the audio and video are out of sync.
Solution 1
Each audio sample rate converter (SRC) can be configured to
automatically track the processing delay of one of the video outputs. To
apply the internal audio tracking feature, follow this path:
Audio Setup>Global Audio Config>I/O Delay Config and then select
one of the four or eight I/O Delay SRCx parameters.
To synchronize the audio, assign the output video type to the associated
audio SRC(s).
The I/O Delay SRCx parameters are responsible for compensating the
internal video propagation delay such that the audio channels are
delayed in correct amount with respect to the chosen video output.
Depending on the enabled internal processing options and signal path,
the processed video's delay may vary from a few microseconds to
several frames. Therefore, the aggregation of video delay is derived at
the output as the I/O delay signal to be passed to the audio synchronizer
to match the audio-to-video delay automatically.
Figure B-7 on page 236 illustrates how the I/O Delay signal is derived
in SDI-to-SDI signal processing when some of the processing block(s)
are activated. Some of the processing blocks that can be applied to the
signal include SD ARC, Noise Reduction, User Fixed Delay.
Due to the flexibility of the M-Path mode, the default setting for this
parameter is None and this selection sets the X75 in Delay Only mode.
When any one of the I/O Delay SRCx parameters is set to track certain
output video, the Autotrack LED on the control panel is lit.
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