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<DIV>No easy way to compare TBC's. There are a couple of things to look
for.</DIV>
<DIV> </DIV>
<DIV>1 8 bit or 10? If 10 more quantizing levels to
allow better pictures.</DIV>
<DIV> </DIV>
<DIV>2 What is window? For a vertical lock machine,
It only has to be one line. Then you have the issue of providing advanced
sync to the machine to get the correct time out of the TBC and stay centered in
the window.</DIV>
<DIV> </DIV>
<DIV>3 Direct color always has a better bandwidth so thus
more detail and quality of picture. But the real issue is how good are the
filters. The pre A-D filter has to be wide enough to not cause artifacts
and yet keep the video below the Nyquist frequencies. The post D-A filter
has to be good enough to prevent ringing yet smooth out the samples and keep
bandwidth flat. These are tradeoffs that are made during the design of a
TBC. More with cost than anything else. I say that because it
depends on the market that you are marketing the TBC to. </DIV>
<DIV> </DIV>
<DIV>4 Sample rates are always better at higher
numbers. 4X subcarrier is one that is popular in NTSC because you can do
some tricks in the color process. Also if you are doing any size changes
it makes the math easier.</DIV>
<DIV> </DIV>
<DIV>5 A TBC that is designed for heterodyne process will
always look worse than a direct one on a non heterodyne signal. Just the
nature of the filters for Chroma and Luminance processing.</DIV>
<DIV> </DIV>
<DIV>Those are my thoughts. And I am no expert. These are just
observations over the years.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV></FONT><DIV CLASS="aol_ad_footer" ID="be8489dc20b9210677e018503f7ead94"><br/><font style="color:black;font:normal 10pt arial,san-serif;"> <hr style="margin-top:10px"/><B>A Good Credit Score is 700 or Above. <A HREF=http://pr.atwola.com/promoclk/100126575x1221823300x1201398714/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=JulystepsfooterNO62>See yours in just 2 easy steps!</A></B></font></DIV></BODY></HTML>