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<DIV>John:</DIV>
<DIV> </DIV>
<DIV>The first quads (from both Ampex and RCA) had no timebase correction,
and relied totally on the stability of the electromechanical components to
reproduce the signal with minimal timing errors. However, this
approach does not have the stability required to reproduce the color information
without considerable errors which must be corrected by removing the jitter from
the chroma signal. At that time, the heterodyne system was the only known
way to accomplish that and it was used until the introduction of Amtec and
Colortec allowed for direct recovery of color thru electronic time base
correction.</DIV>
<DIV> </DIV>
<DIV>That being said, RCA and Ampex used different methods for the early color
playback. RCA used bandpass filters to separate the luma and chroma from
the composite playback signal, then used a heterodyne process to remove the
phase errors from the chroma and recombine it with the luma to form the
corrected color composite output. Ampex used a different approach and
decoded the composite signal into Y, I & Q, and then re-encoded the signal
using station reference 3.58. </DIV>
<DIV> </DIV>
<DIV>Since in both systems the recording process was direct, a first generation
LBC recording can be played back with fully phased color, but a second
generation must be played back in the non-phased color mode. However, I
believe the original question may have had more to do with the other parameters
of the early RCA system. This obviously predated the low band color
standard, and so different modulation frequencies, emphasis curves, etc. may
have been used in the original machines.</DIV>
<DIV> </DIV>
<DIV>Don<BR></DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=jwalko@scenesavers.com href="mailto:jwalko@scenesavers.com">John
Walko</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=quadlist@quadvideotapegroup.com
href="mailto:quadlist@quadvideotapegroup.com">'Quad List'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, November 10, 2009 10:37
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [QuadList] RCA Color
Tape</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Chris:<BR><BR>Forgive
my ignorance, but why was it done this way? I mean, wouldn’t it have
made sense to record at full bandwidth and then playback at full bandwidth
rather than separating it from base band?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Did
this have something to do with bandwidth limitations with NTSC
broadcast?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">It
never fails to amaze me how complex a piece of machinery a Quad videotape
machine is. The guys who designed and built these machines were pretty
intelligent…to say the least.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Thanks;<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">John
Walko<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Media
Archive Manager<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Scene
Savers<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><A
href="http://www.scenesavers.com">www.scenesavers.com</A><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">800-978-3445<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
quadlist-bounces@quadvideotapegroup.com
[mailto:quadlist-bounces@quadvideotapegroup.com] <B>On Behalf Of
</B>Chill315@aol.com<BR><B>Sent:</B> Tuesday, November 10, 2009 8:33
AM<BR><B>To:</B> quadlist@quadvideotapegroup.com<BR><B>Subject:</B> Re:
[QuadList] RCA Color Tape<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">RCA
used direct color for the recording. Nothing was done to the
signal. It was recorded at full bandwidth to the
tape.<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">The
playback was where the interesting process took place. The color was
separated from the base band. Then in a heterodyne process, the color
was stabilized back to 3.58. The jitter was removed and then the two
were put back together. The result was a viewable signal but the color
was no longer locked to the video. Thus it could not be mixed with
another signal or much of anything else. This process worked without the
servo being locked to either vertical or horizontal. That was a unique
way to do it.<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">As a
side point, if you ever wondered what the "Non Standard" position on the
Colortec was used for, it was used to play back a tape that was copied from a
machine that used the RCA method to stabilize the
color.<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">Chris
Hill<o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'"><BR><BR>__________
Information from ESET NOD32 Antivirus, version of virus signature database
4592 (20091110) __________<BR><BR>The message was checked by ESET NOD32
Antivirus.<BR><BR><A
href="http://www.eset.com">http://www.eset.com</A><o:p></o:p></SPAN></P></DIV><BR><BR>__________
Information from ESET NOD32 Antivirus, version of virus signature database
4592 (20091110) __________<BR><BR>The message was checked by ESET NOD32
Antivirus.<BR><BR><A href="http://www.eset.com">http://www.eset.com</A><BR>
<P>
<HR>
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