[QuadList] [Quad List] Question of the week-RCA AE 6000 editor/TEP

[Trevor Brown]

Sorry David Brunch blanking is not part of 8 field PAL it's a four field
sequence

and is part of the original PAL spec

 

It's now widely believed that it was unnecessary removal of some of the
colour burst in the vertical interval and was only implemented because Dr
Bruch had a faulty TV at the time when he developed the system

It's now locked in because it's the  easy way to identify the four field
sequence

field 3 where the first colour burst is nearer to the vertical interval than
anywhere else so you can detect field three with a simple monostable fired
from field sync

So we cannot remove it

 

RCA forgot to add it to the TK76 camera and some machines would not lock to
TK76 cameras because of this

So the internal SPG chip grew external components to add it 

 

TrevorB

UK member

 

 

From: quadlist-bounces at quadvideotapegroup.com
[mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of David
Crosthwait
Sent: 09 March 2011 16:39
To: Quad List
Subject: Re: [QuadList] [Quad List] Question of the week-RCA AE 6000
editor/TEP

 

Trevor and Tony,

 

I had always heard of the "8 field Bruch Sequence" and later on in life in
linear edit bays operating in 625 PAL here in the U.S, dealt with long
pre-rolls and the PAL color framing issues. This was particularly gruesome
with PAL 1" type B and C edits. "Bruch" refers to Doctor Eng. Walter Bruch
of Telefunken labs who invented the PAL system in 1965. Did either of you
ever meet Dr. Bruch? He passed away over two decades ago.

 

http://www.flickr.com/photos/12064036@N04/4050912252/

Which leads to this:

http://www.radiomuseum.org/forum/45_years_anniversary_of_walter_bruchs_pal_c
olor_television.html

 

David

www.dcvideo.com

 

 

On Mar 8, 2011, at 1:31 PM, Tony Quinn wrote:





In message <003101cbddd6$f30f09e0$d92d1da0$@com>, Trevor Brown
<videovault at sky.com> writes



Tony I bow to your mathematics it's a long time ago

Was it not 1/4 cycle of subcarrier ?  4.43361875 Mhz


Half a cycle ... It resulted in Colortec going (effectively) from one end to
the other)



 

It's a small picture jump that you get away with on cuts

110 or 112.7 its equally annoying


Only on invisibles, if there's as change of picture content it becomes )to
all intents and purposes) invisible



 

Colortec ??? CATC   :-(


Yes - but I have very limited experience of RCA kit - VT24 was about my
limit -  I would never, due to grades at the time, have been allowed into
Suite 2 (Rip. Scratch, and all that)
-- 
If one person has delusions, we call them psychotic. If, however, 1.5
billion
people have delusions we must apparently call them a religious group, and
respect their delusionary state.

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