HDA800(V2) Serial Protocol, Version 1.3, 9/12/13
65
Audio Control
Each input is capable of delaying audio for up to 170.65mS. The delay resolution is 1/48000 of a sec-
ond, or 48 counts per millisecond.
Command format:
^LSI @
in
,@
in
,
delay
Set the lip sync delay an input or inputs.
^LSI @
in
,+
step
$
Add ‘step’ to input’s delay.
^LSI @
in
,-
step
$
Subtract ‘step’ from input’s delay.
Response Strings:
^=LSI @
in
,
delay
$
Where:
@
in
= One (or more) inputs to be affected.
delay
= Lip sync delay in 48KHz samples, each count delays audio by 1/48000 of a second.
A value of 0 indicates no delay.
There are two forms of the lip sync delay commands, the ‘LSZ’ command which sets lip sync delay on
a zone by zone basis, and the ‘LSI’ command which sets delays on a input by input basis. Which one to
use depends on what is causing the video delay, and where it’s connected in the video path.
If the input of a video processor (or monitor) that adds a video delay is connected to a zone, then the
‘LSZ’ command should be used to delay the audio by the same amount of time the video is being
delayed. Only audio that is being sent to the video processor, attached to the zone, will be delayed.
If on the other hand, if the output of a video processor that adds a video delay, is connected to an input,
then the ‘LSI’ command should be used. This allows all zones that connect to the video processor, to
have their delays automatically adjusted to compensate for the processor’s video delays.
Both inputs and zones can have delays set, however the overall delay cannot exceed 8191 counts (or
170.65mS). If an input and zone combination exceeds 8191 counts, no error will be generated and the
delay will be set to 8191.
For examples, see the examples of the ‘LSZ’ command on page 64.
Summary of Contents for HDA800
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