Test Pattern Generator (Tpg) - pro bel V6402 HD User Manual

V6402, V6404, V6406,V6408
and V6418 HD converters
3.3.3

Test Pattern Generator (TPG)

V6418SY
V6408SY
V6402 V6404SY V6406SY
The V6402 and the V6404/06/08/18 with the SY option fitted come with a built-in Test Pattern Generator
(TPG). The test patterns can be used to provide signals for system testing and even for testing other
pieces of equipment. All test patterns are generated 'on-the-fly' and do not interfere with the current
contents of the Frame Buffer. Clean switching between test patterns and the selected live video input is
also provided.
On a V6402, the test patterns are being generated on the 'Output' side. It also means that they cannot be
used as an internal confidence signal for proving the correct operation of the V6402 itself.
On the V6404/06/08/18, test patterns are being generated on the 'Input' side to the filtering and scaling
processor, which means that they can be used to verify the conversion process.
The vertical interval is considered to be a part of the test pattern and is always synthesised as Black. This
means that the vertical blanking interval is always blanked when Test Patterns have been selected. The
same applies to Ancillary Data in the horizontal blanking interval.
The actual TPG selection menu can be found in the 'Engineering' Menu (ENG'ING : Test Ptn):
The default setting in the Test Ptn sub-menu is: TPG Off
From the remote control system they can be called up directly.
From here you have a choice of up to 7 built-in test patterns. Test pattern No.7 is a 'reserved' or a custom
Test Pattern and might change between different firmware versions. At the time of printing, it is set to
'Black'. Note that the 100% and 75% colour bars have limited transition rates between adjacent bars.
38 Issue 6