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<P class=MsoNormal style="MARGIN: 0in 0in 0pt">Question: Why would the chroma
not have the same error as the luminance?<BR><BR>How does velocity error show up
in monochrome?</P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I would explain it this way. The
Chrominance, when NTSC encoded, is ALL contained "of" the frequency of 3.58 Mhz,
it is the Phase of the 3.58 that is modulated. The Color Burst on each line
is the reference phase (Plant Sub carrier) used in decoding & error
detection systems.</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">When you make a recording all Quad
error exists to luminance & Chrominance equally and may be corrected
together.</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">All error Correction systems "may”
be correctly considered "Coarse" (Line rate Comparison) followed by
"Fine" (3.58 Color Burst comparison). </SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The comparison of 3.58 color burst
(off tape) to plant Sub carrier has a very narrow window. Phase
between lines is 180 deg; phase between fields is 90 deg. The Phase of
Color Burst is four (4) fields or 2 frames. The 140nsec shift most editors
have/had to deal with is difference between</SPAN> <SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">frame 1 or 2. RS170A defines
field one of the four field sequence but... but... As my old
friend Charlie Spicer would say in his SMPTE papers.. "Nobody can tell if
it 12 PM or 12 AM” just by looking at the NTSC Color Burst</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Back to the non -phase problem:
When you encode chrominance using plant sub carrier you are basically
burning-In all error of chrominance. All Quad error exists but you can't
see it with your eye or corrected it electronically.</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The functional block of a NTSC
decoder was not trivial in the</SPAN> <SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Era of quads, remember the one line
delay using Glass in the drop out comp. The Non-Standard button must bypass
the line-to-line TBC correction but may have allowed burst
3.58 correction;</SPAN> <SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">again that correction is limited
unless line correction is done first.</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The First demod/re-mod solution to
non-phase error was provided by after market TBC’s for Umatic, in about</SPAN>
<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">1978-79. Those gave way
to hi-end GRB decoding with color-correction</SPAN> <SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">& all the feature sets, these
can be used</SPAN> <SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">on all NTSC
encoded signals.</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">RE: TRC100A question. The last 7
machines where delivered to NBC-NYC in ~ 1985. These replaced the existing
TCR's of 3rd & 4th shop order. The 7th shop order</SPAN> <SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">was TCR100A & SP100A. The
Machines where delivered</SPAN> <SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Standard MONO 70 mil, but upgraded
on site by RCA</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">to Stereo Split track (2
ea, 25Mil plus guard band). The</SPAN> <SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">EPIS (electronic program ident
system) was transferred from old to new. I was the NBC BSE
Project Engineer</SPAN> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Note: I salvaged some mono 70
mil heads & one set of old interconnect cables (SP100
toTCR).</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Just a comment Re: Audio Quality
& Picture to Sound timing. Audio quality is normally a
function/limitation of the TAPE not electronic or copper limitations. The days
of quad had near Zero audio to video delay within plants. The invention of
Digital affects introduced the frame of delay.. and then video frame syncs.
Audio delays followed in ~ about 1987-88 and the Electronic Clap board
feature in the TEK- VM700 </SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">That’s my
memory,</SPAN></P></DIV></BODY></HTML>