Ensemble Designs 8500 Composite / SD Legalizer and Video Processing Frame Sync User Manual
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Audio Example 3: Here stereo audio embedded on an SDI stream is arriving via
microwave, but lip sync is off by about 65mS due to video passing through upstream
frame stores. We wish to synchronize to house reference and add monaural analog back-
ground music to the audio, then re-embed it back into the SDI video stream.
1. SDI 1/2 is selected with the In 1/2 Sel so as to feed the disembedded audio to
channels 1 and 2 of the 4x4 audio mixer.
2. In the Audio Mix menu, select Ch1 for Output Bus 1 and Ch2 for Output Bus 2.
3. Anlg 3/4 is selected with the In 3/4 Sel. The monaural music is fed to channel 3
input with the channel 3 fader set to -10dB for proper background music level.
4. Channels 1 and 2 are selected for Output Bus assigns on this mixer so as to
produce the desired background music mix for re-embedding.
5. A Bulk Delay of 65mS is used to correct for the upstream error.
6. Select Embed On to embed the audio on to the SDI video output stream.
7. Auto Track is set to the On state so the tracking audio delay will the match delay
of the video frame synchronizer thus producing proper delay and correct lip sync.
8500-20
Model 8500 Series Modules