7700 MultiFrame Manual
7736CEM Composite Encoder with Monitoring
Revision 1.5
Page - 17
*Grey background indicates un-implemented or un-tested features
7.4.2. Audio Freeze Mode (-A4)
Audio
Two selectable actions can take place when input video is removed; pass and
mute.
If it is desirable to maintain audio through the encoder (only valid with AES
inputs), then set this control to
pass.
When set to mute, the audio will
automatically be muted when video is removed.
Audio freeze
mode
pass
mute
7.4.3. Additional Audio Delay (-A4)
Audio
In addition to delaying the audio the same amount that the video is being
delayed (in the video frame synchronizer), additional user requested delay may
be added or removed with this control.
WARNING: It takes approximately 1 minute, 40 seconds to adjust the audio
delay by one second. This is required by the buffer management algorithm
when changing the audio buffer size at a 1% rate without muting the audio. This
long buffer adjusting will happen on power-up or when a new user supplied
value is set with this control. However, the audio is still usable while the buffer
is being adjusted. This is good for "On-Air" adjustment of audio delays!
NOTE: Advancing audio can only happen when video is undergoing a delay
that is greater than the audio! If the system configured video delay becomes too
small, the audio buffer shrinks to its smallest delay and stays at that value.
Audio delay
0
-37ms to
5sec in
0.5ms
increments
