ADLY-4/A User Guide
Page 6
Operation
This section provides explanations of the rotary frame delay and Ref switches on the front panel
of the ADLY-4/A.
Using the Video Frame Rate Switch
The 3-position
Video Frame Rate
Switch
allows a selection of the delay based on frame rates of
24, 25 and 30 frames per second. Select the frame rate of the video to be delayed by rotating the
switch. It should be noted that the video frame rates are only accurate at a 48kHz sample rate
reference. At other sample rates the delay time is 48kHz divided by the sample rate. As an
example, if the sample is 32kHz, the delay is 48kHz/32kHz or 1.5 times the selected delay.
24
25
30
FPS
Frame Rate Switch
The table below provides delay values in milli-seconds for each
Frame Delay Switch
based on
where the
Video Frame Rate Switch
is set. Note that these values are based on a 48kHz
sample rate.
Position
10 Frames @ 48kHz
1 Frame @ 48kHz
0.1 Frames @ 48kHz
24
416.4 ms
41.6 ms
4.16 ms
25
400 ms
40 ms
4.0 ms
30
333.33 ms
33.33 ms
3.33 ms
Using the Frame Delay Switches
The three 10-position
Frame Delay Switches
are divided into three separate values. These
values are X10, X1 and X.1 and are labeled above the switch that they apply to. Dial in the delay
in frames desired using the multiplier labeled above the switch. The illustration below shows a
delay of 74.2 frames. The X10 switch is set to 7 which represents 70 frames, the X1 switch is set
to 4 which represents 4 frames and the X.1 switch is set to 2 which represents .2 frames. Adding
them together makes the 74.2 frames of delay. At a 48kHz audio sample rate and 30 frames per
second video setting this is a total delay of 2.47098 seconds. All four balanced AES outputs will
be delayed by this value.