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Some information I got from Toshiba a while ago:
Picture mode 3 has Horizontal Scan Velocity Modulation (HSVM) turned off.
This is used to sharpen up the edges of fast black to white & white to
black transitions ie: text in captions (not Teletext) without it the right
hand edges of bright objects look softer.
Picture mode 1 is for Shop demonstration only ie: 100% contrast, 100% HSVM,
50% Brightness, Colour and Sharpness.
Picture mode 2 at mid settings 50% inc (HSVM) is the best starting point
for use at home.
Picture mode M is what is memorised after you have tweaked either of the
other modes for personal taste.
There are two modes of 100Hz operation:-
100Hz = this is the original method of doubling frame scan (called AA+BB)
it overcomes frame flicker but cannot improve line jitter (interlace is
causing this) hence the fact when an On screen menu is displayed it is
bouncing between the lines.
Natural = the latest of our designs using AA'+BB' system, A' and B' are
fields made up from the previous fields in memory but with and fast moving
objects ignored.
Note: UK 625 line TV display is made up of 25 pictures per second (called a
frame), each picture is made from an Odd number field, lines 1,3,5,7,9 etc
then an Even field, lines 2,4,6,8 etc hence a normal vertical scan rate of
50Hz.
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