User guide
DM-14B & DM-14C User’s Guide
20
H-SYNC FUNCTION FOR DM-14B
(Visualisation of the Analog TV & SAT synchro. active area)
DIRECT: To activate the H-SYNC function, by pressing the key for 2 seconds, select SYNC AREA using the encoder.
The picture is moved and the synchro graphic generated, locked to the signal received, to show the function “visualisation of the active synch area”.
As you can see the darker bar (black) is the synchronism, the dark grey bars are the front and back on the synchro and the lighter bar represents the chroma BURST.
a) THE MAIN OBJECTIVE OF THE MEASUREMENT is to analyse the SYNCHRO H area in time, to visualise possible interferences or reflections, as well as signal distortions and
compressions.
b) In the synchro’s lighter bars, it is much easier to recognise all the various types and quantities of reflections and/or interferences, even with moving pictures, because this active area is not
influences by the contect of the picture and it should be clean in ordeer to have a perfect picture. For example, a white line to the write of the synchro represents a “reflected signal”, which is
whiter, stronger and viceversa.
c) When there are signal compressions and/or saturations, the dark/light areas tend to unify in intensity (compression) and distort (saturation). This function shows all the phenomena described
above, which are usually difficult to see with moving pictures or with a simple SYNC visualisation.
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