Crystal Vision
Statesman
SYNNER-E 3G User Manual R1.2
65
10/09/2012
Invert
Each of the 32 audio input channels can be individually inverted by selecting invert in the de-
embedder input audio control area and AES input audio control area.
Note:
When routing Dolby E, to ensure integrity of the audio any Dolby E stream must be
treated as a stereo pair and no audio processing such as mute, mono and gain is applied.
Resamplers
The Resample Enable control affects how the audio data is manipulated to change the PCM
delays. On resampled channels (resample enabled) the audio will be continuously resampled
allowing seamless changes in audio delay. On non-resampled channels (resample not enabled)
samples will be passed unchanged through the signal path: if the delay has to change, single
audio samples will be dropped or repeated as required. This control has no effect on channels
containing Dolby E.
Audio delay
Audio delay can be assigned, or not, to each individual stereo pair by checking the tick-boxes
adjacent to each pair. Audio present for each audio pair is given by a simulated LED. A useful
feature is the total delay which is given in milliseconds. Please note that the total delay is the
sum of the fixed delays plus the variable tracking delay which will make this combined value
change as the video input timing varies against the external reference.
Audio input
Audio delay
Each de-embedder and AES input stereo pair has a set of controls to enable the various delays.
These controls in combination with the video delay controls can be used to delay the audio
with respect to the video and compensate for any small delay between the incoming video and
audio signals, or when bypassed delay the video with respect to the audio by up to several
video lines. See the delays discussion in the introduction for details of how these various
delays interact with each other. The selectable delays are; Frame delay giving a fixed 1 or 2
lines of delay, User delay which selects the global -20 to 80ms delay, TAD (tracking audio
delay) to ensure the audio follows the output video timing, and Dolby E alignment to ensure
the correct positioning of the guardband.
