HD2200
SECTION 4
HD22 14/03/01 Version 1 Issue 2
4.17
DELAY MODE
Used to control the delay applied to the audio as it
passes through the machine. The audio delay
applied comprises two components; the machine
automatic delay which compensates for the delay
in video processing, and any additional delay the
user wishes to apply to compensate for upstream
or downstream video processing delays.
The menu controls the way in which the automatic
audio delay works. The video delay through the
machine depends on many variables. If the unit is
not running with its input and output locked
together then the processing delay may be
variable – if the unit is Synchronise or Optimise
mode.
The options are:
Nominal
The automatic audio delay is set to the
nominal value for the conversion being
undertaken. This is the average video
delay that can be incurred. This will be
the same as the actual video delay for
conversions that have the input and
output frame rates locked together and,
the vertical genlock timing set so that
the output and input vertical syncs are
roughly co-timed.
Min
The audio delay is set to the minimum
video processing delay that can be
incurred for the conversion being
undertaken.
Max
The audio delay is set to the maximum
video processing delay that can be
incurred for the conversion being
undertaken.
Zero
The audio delay is set to zero and the
user can set the entire audio delay
using the AUDIO – MAN DEL menu
MANUAL DELAY
This allows the user to apply a manual offset to the
audio delay setting. This offset can be positive or
negative, thus allowing the user to increase or
decrease the audio delay as required. The audio
delay offset is added to the automatic audio delay
to provide the total audio delay.
The manual audio delay range when the automatic
audio delay mode is set to ZERO is 0 to 500ms.
The actual audio delay applied is the sum of the
automatic delay and the manual delay. For
example, if the automatic delay works out to be
64ms the manual delay range will be –64ms to
436ms.
