Lynx P VD 5010 B, Reference Manual

Page: 14 / 31

Reference Manual P VD 5010 B Version 1.1
Page 14
Audio Delay Pulse
The Audio Delay Pulse is connected through a BNC
connector with TTL levels and needs 75 Ohm
termination.
Min. Delay in Frame Synch Mode is 1 Frame
Min. Delay in Line Synch Mode is < 1µs
Audio Delay – synchronous mode
When the frame sync is used in normal
asynchronous mode it is possible for the frame sync
to drop or add frames to keep in sync (which is
normal). Under these circumstances simply
dropping frames of audio would result in audible
clicks and pops. We overcome this by loosely
tracking the audio to the video within an audio
delay window of +/- 0.5 frame with respect to
video.
If you have a synchronous input to the frame sync,
then there is a new mode to switch the frame sync
into a audio / video delay line function [expert tab,
selection "synchronous"] In this mode the +/- 0.5
frame window is removed and the audio is
perfectly in time with the video.