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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>This is somewhat reminiscent of the AVR-1
and its startup procedure. When rolled, the AVR-1 would near-instantly
start playing the tape at full speed (possible because of its vacuum columns
and low-inertia pancake capstan motor). During this brief period it would
look for a reference pulse from the tape. Once it retrieved a reference
pulse from the playing tape, it would then know how far ahead or behind the
tape was from house reference. It would then (generally) accelerate the
tape the amount (and duration) needed to make the next reference pulse coincident
with house reference. The wide-window TBC took care of the rest. This
resulted in virtually an instant roll, although in reality it was about 2 to 3
frames. This was not noticeable or objectionable (to the home viewer) during
normal program content, but you could hear the servo working to align the tape
reference with house reference when rolling a tape containing bars and
tone. That is to say you would hear normal tone, followed briefly by tone
that was an octave higher (sync phase), followed again by normal tone.
Pretty amazing stuff !!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Steve Walton<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
quadlist-bounces@quadvideotapegroup.com
[mailto:quadlist-bounces@quadvideotapegroup.com] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Norman Hurst<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, August 23, 2012
8:04 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Quad
List</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [QuadList] Servo
Modes</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='background:white'><font size=2 color=black
face="Times New Roman"><span style='font-size:10.0pt;color:black'>The Dischert
invention was demoed to lock in less than 6 frames from the time you pushed
play. That's 200 ms. It was amazing.<o:p></o:p></span></font></p>
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<p class=MsoNormal style='background:white'><font size=2 color=black
face="Times New Roman"><span style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'>The figure on the first page of the patent
shows the acceleration profile relative to house reference. <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'> <a
href="http://www.google.com/patents?id=K043AAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false"
target="_blank"><span class=yshortcuts><span id="lw_1345765042_0">http://www.google.com/patents?id=K043AAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false</span></span></a><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='background:white'><font size=2 color=black
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