User manual

Easysound Stand-alone User Manual System Timing
Miranda Technologies Ltd Page 79
the Easysound Standalone will permit settings in excess of the maximum
permissible, the effective adjustment limit is reduced accordingly.
If either signal is late with respect to the A/BGnd input then the lower
propagation delay limit value is effectively increased accordingly. For
example, if Key is 5µS late and B/FILL is 5µS early, with respect to A/BGnd
then the valid adjustment range, with EasySound, is effectively reduced to "0
lines and 17.025µS" through "0 lines and 58.899µS".
Analogue Reference (Black and Burst)
Using the Black and Burst analogue input as reference, the timing and
synchronisation adjustment has to be given a much wider range. B&B signals
have typically been looped through a number of cascaded equipment and
extensive propagation delays are possible. The full range of the adjustment is
from "- 7 lines - 63.666µS" to "+7 lines + 63.444µS". When setting up
Easysound Standalone to operate with the B&B reference, that signal and an
analogue version of a PGM or PVW output signal should be viewed on two
traces of an oscilloscope. View the frame pulse of the each and adjust the
timing setting until the two frame pulses occur within the same line. With this
achieved, view both an analogue copy of the BGnd/A signal and an analogue
output signal. Adjust the propagation delay as described taking care not to
alter the "line" value.