OPTIMOD SURROUND PROCESSOR INSTALLATION
2-19
If this parameter is set to OFF, then the 8685 will output “0000” (“mode
not indicated’). This is the safest setting if you are uncertain whether
downstream equipment can respond appropriately to these bits.
14. Set the Processing Delay for a given signal path (optional).
[minimum], [30 fps], [29.97 fps], [25 fps], [24 fps], [33-50 ms in 1 ms increments]
You can set the delay through the surround and 2.0 processor paths independ-
ently. This feature is usually used in sound-for-picture applications to add time
delay so that the input/output delay through a given processing path is exactly
one or two frames, using a variety of different standards. (Two frames are re-
quired for 59.94/60 fps progressively scanned video.) The selections are M
INIMUM
(depends on processing structure in use; typically between 20 and 23 ms), 30 fps,
29.97 fps (NTSC color video), 25 fps (most PAL video), and 24 fps (film). You can
also set the delay in 1 millisecond increments.
When equipped with the optional HD-SDI module, the 8685 offers video delay of
up to 11 frames. This can match the delays of the optional Penteo upmixer and
optional Dolby-E encode and decode modules.
L
OCATE to I/O CALIB > SURROUND/2.0 OUTPUT and set the delay as required using
the S
URROUND and 2.0 fields.
This control does not affect the delay to a given output if that output is
in
AGC or MULTIBAND mode.
IMPORTANT: If the 8685 is processing Dolby metadata (via its serial or SDI con-
nections), you must set the 8685’s processing delay to match the frame rate of
the associated video. This is because the 8685 delays the metadata by exactly one
frame to comply with Dolby’s requirements for synchronization of the metadata
and video frames, so the audio must also be delayed by one frame to keep the
audio and metadata in sync.
To maintain video AV-sync if you are not using the 8685’s HD-SDI option, you
must delay the video by one frame elsewhere in your facility. The 8685’s optional
HD-SDI module will automatically delay the video by one frame, hence keeping
audio, video, and metadata in sync.
If the optional Dolby-E modules are installed and/or the optional Penteo upmixer
is in use, the HD-SDI module will add additional video delay to maintain AV sync.
You must set the V
IDEO SYNC control to AUTO to enable this feature.
I/O Setup
The following material provides detailed instructions on how to set up the 8685. If
QUICK SETUP does not fully address your setup needs or if you wish to customize
your system beyond those provided with QUICK SETUP, then you may need the addi-
tional information in the sections below. However, for most users, this material is
only for reference because QUICK SETUP has enabled them to set up the 8685 cor-
rectly.
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