AERO.2000 User Guide July 2016
L16/1/18039
©2016 LINEAR ACOUSTIC INC. THE TELOS ALLIANCE. ALL RIGHTS RESERVED
Page 22
6.
If this is the first time you are saving your working preset then select Save Preset As and
press Right.
7.
Select alpha numeric characters using the Rotary and press Right after every selection to
create the name. When finished select Save and press Right.
8.
Press Left to return to main menu.
Figure 5-5
Left: SDI video delay settings; Right: Output Delay settings available for each instance
5.8.6
5.8.6
5.8.6
5.8.6
Configuring Audio Delay
Configuring Audio Delay
Configuring Audio Delay
Configuring Audio Delay
The calculations for video delay and audio delay are not difficult. An example for ATSC video is
given.
AERO.2000 audio processing/loudness control latency is 180 ms. AERO.2000 Dolby Digital
encoding latency is 64 ms. AERO.2000 total latency for processing and Dolby encoding is 244
ms.
•
A video frame is 33.36 ms. 244ms/33.36ms = 7.31 frames.
•
8 frames is the nearest whole frame so viedo delay should be set for 266.88 ms.
•
To make the Dolby Digital output audio latency match this value of video delay some
additional delay of the Dolby Digital output is required.
o
Subtract the processing latency plus Dolby encoding delay from the total video
delay:
o
266.88 – 244 = 22.88ms.
o
An additional Dolby Digital delay of 22.88 ms will match the Dolby output to the
video output. 22 ms is a good approximation.
o
A lip sync test can be used to fine tune the value if necessary.