<html><head></head><body bgcolor="#FFFFFF"><div>Excellent description and I agree. The AVR-1 and ACR-25 performed the fast (200 ms lock) regularly. I also agree the two main issues seemed to be the no pinch roller vacuum capstan and the wide TBC (binary switched glass delay line TBC)</div><div>Also related to a similar thread we (an independent station with no network spot support) ran our only ACR direct to air for many years. It was something us techs were very proud of.</div><div>So......speaking of proud....it is absolutely amazing what engineers did 30 to 40 years ago with no operating systems to take advantage of. Three developments to think about are the above fast lock VTR's; the Chyron and the ADO. I think most of this using massive TTL logic?</div><div>Someone can back me up here but I think the ADO had a 200 Amp 5 volt supply to run all those chips. The Chyron and ACR (logic bay) even did all this with wire wrap on the chips (I think)</div><div><br></div><div><br><br>Sent from my iPad<div>Wayne Watson</div></div><div>Calgary Canada</div><div><a href="mailto:Wayne.watson@sait.ca">Wayne.watson@sait.ca</a></div><div><br></div><div><br>On 2012-08-23, at 7:13 PM, "sgw1009" <<a href="mailto:sgw1009@earthlink.net">sgw1009@earthlink.net</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><span></span><br></div></blockquote><blockquote type="cite"><div><span></span><br><span></span><br><span>This is somewhat reminiscent of the AVR-1 and its startup procedure. When</span><br><span>rolled, the AVR-1 would near-instantly start playing the tape at full speed</span><br><span>(possible because of its vacuum columns and low-inertia pancake capstan</span><br><span>motor). During this brief period it would look for a reference pulse from</span><br><span>the tape. Once it retrieved a reference pulse from the playing tape, it</span><br><span>would then know how far ahead or behind the tape was from house reference.</span><br><span>It would then (generally) accelerate the tape the amount (and duration)</span><br><span>needed to make the next reference pulse coincident with house reference.</span><br><span>The wide-window TBC took care of the rest. This resulted in virtually an</span><br><span>instant roll, although in reality it was about 2 to 3 frames. This was not</span><br><span>noticeable or objectionable (to the home viewer) during normal program</span><br><span>content, but you could hear the servo working to align the tape reference</span><br><span>with house reference when rolling a tape containing bars and tone. That is</span><br><span>to say you would hear normal tone, followed briefly by tone that was an</span><br><span>octave higher (sync phase), followed again by normal tone. Pretty amazing</span><br><span>stuff !!</span><br><span></span><br><span></span><br><span></span><br><span>Steve Walton</span><br><span></span><br><span></span><br><span></span><br><span> _____ </span><br><span></span><br><span>From: <a href="mailto:quadlist-bounces@quadvideotapegroup.com">quadlist-bounces@quadvideotapegroup.com</a></span><br><span>[mailto:quadlist-bounces@quadvideotapegroup.com] On Behalf Of Norman Hurst</span><br><span>Sent: Thursday, August 23, 2012 8:04 PM</span><br><span>To: Quad List</span><br><span>Subject: Re: [QuadList] Servo Modes</span><br><span></span><br><span></span><br><span></span><br><span>The Dischert invention was demoed to lock in less than 6 frames from the</span><br><span>time you pushed play. That's 200 ms. It was amazing.</span><br><span></span><br><span></span><br><span></span><br><span>The figure on the first page of the patent shows the acceleration profile</span><br><span>relative to house reference. </span><br><span></span><br><span></span><br><span><<a href="http://www.google.com/patents?id=K043AAAAEBAJ&printsec=abstract&zoom=4#v=on">http://www.google.com/patents?id=K043AAAAEBAJ&printsec=abstract&zoom=4#v=on</a></span><br><span>epage&q&f=false></span><br><span><a href="http://www.google.com/patents?id=K043AAAAEBAJ&printsec=abstract&zoom=4#v=one">http://www.google.com/patents?id=K043AAAAEBAJ&printsec=abstract&zoom=4#v=one</a></span><br><span>page&q&f=false</span><br><span></span><br><span></span><br><span></span><br><span></span><br><span></span><br></div></blockquote><blockquote type="cite"><div>
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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">
<a href="mailto:quadlist-bounces@quadvideotapegroup.com">quadlist-bounces@quadvideotapegroup.com</a>
[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>
</div>
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12.0pt"><o:p> </o:p></span></font></p>
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<div>
<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>
</div>
<div>
<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>
</div>
<div>
<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>
</div>
<div>
<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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</o:smarttagtype></div></blockquote><blockquote type="cite"><div><span>______________________________________________</span><br><span>Please trim posts to relevant info when replying.</span><br><span></span><br><span>Change subject to reflect thread direction. Thanks.</span><br><span>_______________________________________________</span><br><span></span><br><span>Send QuadList list posts to <a href="mailto:QuadList@quadvideotapegroup.com">QuadList@quadvideotapegroup.com</a></span><br><span>Your subscribe, unsubscribe and digest options are here:</span><br><span><a href="http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com">http://mail.quadvideotapegroup.com/mailman/listinfo/quadlist_quadvideotapegroup.com</a></span><br></div></blockquote></body></html>